Transcript DSN xStack Training

DSN xStack Training
DAS,SAN,NAS
Nyári egyetem
Evolution of Storage Technology
IP SAN Storage
Direct Attached SCSI
initiator
SCSI
FC
AP+
File System
Ethernet Switch
RAID + File System + AP
DAS
Network Attached Storage
target
RAID
IP-SAN
Fibre Channel Storage
AP+
File System
Ethernet
File System
+ RAID
NAS
Fibre Channel Switch
RAID
AP
D-Link Europe DSN Storage Array Training – March 2010
FC-SAN
DAS/NAS/SAN I/O Differences
(NFS/CIFS)
Block I/O
Block
D-Link Europe DSN Storage Array Training – March 2010
Enterprise
Mission Critical
Applications
Business Critical Applications
Email & Department Level & Remote Database
File / Image & Content Management
Leadership, Management & Customer Database
Medical Database Management
Scientific Data Collection
Working Group Applications
Office applications, Department File-Share
D-Link Europe DSN Storage Array Training – March 2010
DAS Applications
• Creates islands
of storage difficult
to manage
EMAIL
• Capacity
expansion cannot
be shared
SCSI
FC
SCSI
FC
Exp
ERP
FINANCE
EMAIL
ERP
HR FINANCE
 DAS or Direct Attached Storage is connected directly to a server
 Data storage devices normally use SCSI/FC technology direct attached to the server
 Data backup and recovery typically utilize 20-30% of resources (CPU, system, IO, etc.)
 Good performance characteristics suitable for the SOHO environment
 Expansion of DAS is problematic
D-Link Europe DSN Storage Array Training – March 2010
NAS Applications
NAS provides
simple means
of capacity
expansion
EXP
EMAIL ERP FINANCE
EMAIL ERP FINANCE
 NAS or Network Attached Storage connects through a standard Ethernet connection
 NAS is typically configured as a file service for servers and workstations
 NAS can allocate a shared storage space for different server or workstation
 NAS does not perform well in typical block-level applications (transactions, streaming)
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FC-SAN Applications
MAIL
ERP
MAIL
FINANCE
EXP
FC SWITCH
FINANCE
ERP
FC SWITCH
FINANCE
FINANCE
ERP
MAIL
ERP
MAIL
HR
FC-SAN
provides
centralized
expansion and
management
 FC-SAN or Fiber Channel-Storage Area Network provides high performance shared storage
 Provides security features allowing multiple hosts access of the shared storage pool
 Provides block-based data access ideally suited for enterprise class applications
 FC-SAN is the choice for storage infrastructure by large enterprises and service providers
 FC HBAs in each server connect to the FC switch to form the FC-SAN
 FC-SAN solutions are expensive, complex and costly to manage
D-Link Europe DSN Storage Array Training – March 2010
IP-SAN Applications
MAIL
MAIL
FINANCE
ERP
EXP
Ethernet
Switch
MAIL
ERP
FINANCE
FINANCE
HR
ERP
Ethernet
Switch
MAIL
FINANCE
ERP
HR
Expansion is
very simple
and can be
integrated
into an
existing
Ethernet
network
 IP-SAN or Internet Protocol-Storage Area Network provides shared storage
 Use of existing Ethernet infrastructure and server's Ethernet ports lowers costs
 Provides block-based storage ideally suited for enterprise applications
 Use of the existing network infrastructure means simple, rapid deployment of storage
 IP development continues at 10 times the speed of Fibre Channel projecting 40G
networks in the next 2-3 years
D-Link Europe DSN Storage Array Training – March 2010
Evolution of Ethernet
100G
40G
Ethernet has a long history of development from the emergence of Ethernet in 1983 to 10GB-T introduction in 2006
Gigabit devices are now the standard with a new generation of 40G/100G Ethernet technology in the next 2 ~ 3 years
D-Link Europe DSN Storage Array Training – March 2010
Storage Architecture Comparison
Comparison of all relevant factors in selecting the most appropriate storage architecture.
DAS
NAS
FC-SAN
IP-SAN (iSCSI)
Technology
SCSI
Ethernet
Fiber
Ethernet
Performance
High
Low
High
High
Disk
Utilization
Low, 30%
Medium, 60%
High, 70%
High, 70%
Distance
<25M
Unlimited
100KM (No Repeater) Unlimited
Centralized
Poor
Average
Excellent
Excellent
Data Sharing
Poor
Average
Excellent
Excellent
Scalability
Poor
Average
Excellent
Excellent
Backup
Complex
Average
Simple
Simple
DR Design
Poor
Average
Excellent
Excellent
Security
Low
Average
High
High
Management
Low
Average
High
Average
TCO
Low
Average
High
Average
Apply
General Storage
Data Share, Backup,
Redundancy
Mission Critical Data,
Backup, Redundancy
Mission Critical Data,
Backup, Redundancy
Markets
SMB/SME，SOHO
SMB/SME，SOHO
SMB/SME
SMB/SME
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DAS/NAS/SAN Summary
Ethernet
Application
File System
SCSI / FC
Ethernet
Switch
NFS/CIFS
FC
Switch
File System
Ethernet
Switch
File System
File System
RAID
DAS
Application
Application
Application
RAID
NAS
RAID
FC-SAN
RAID
IP-SAN
 DAS – SMB/SME application, limited flexibility
 NAS - focused on shared storage and addressing increasing demand for storage capacity
 FC-SAN - focused on scalable storage optimizing data sharing and management
 IP-SAN – focused on affordable scalable storage without restrictions
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IP-SAN versus FC-SAN
D-Link Europe DSN Storage Array Training – March 2010
Competing Architectures

FC-SAN is highly manageable
and deterministic but inflexible
 IP-SAN is more flexible with
simplified management
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What is iSCSI?


Internet Small Computer Systems Interface
Provides storage access over TCP/IP networks





Maps SCSI functionality to TCP/IP Protocol
Similar to mapping SCSI over Fibre Channel (FCP)
Network Protocol–Peer to HTTP, NFS, FTP, Telnet,
etc. (uses TCP)
Can be used with existing IP & Ethernet networks–
NICs, Switches, Routers, etc.
Reuses networking and storage concepts
D-Link Europe DSN Storage Array Training – March 2010
What is iSCSI ?

iSCSI is a transport for SCSI Commands






iSCSI is an End to End protocol
iSCSI can be implemented with current TCP/IP Stacks
iSCSI can be implemented completely in a HBA
iSCSI has the concept of Human readable SCSI Device (Node)
naming
iSCSI adds its own CRC checking to ensure correct Data
iSCSI Transport includes Security as a base concept



Link Authentication (e.g. CHAP)
iSCSI Authentication for Access Control
IPSec Packet Security (packet authentication and encryption)
D-Link Europe DSN Storage Array Training – March 2010
What is iSCSI?

iSCSI (Internet SCSI) specifies a way to “encapsulate”
SCSI commands in a TCP/IP network connection
D-Link Europe DSN Storage Array Training – March 2010
Generic iSCSI PDU Format
BYTE
00 -- 03
0
01234567
. I
Opcode
1
2
01234567 01234567
F R W 0 0 ATTR
3
01234567
Reserved Reserved
hex 01
04 -- 07
Total
AHSLength
DataSegmentLength
08 -- 15
Logical Unit Number (LUN)
16 -- 19
Initiator Task Tag (ITT)
20 -- 23
Expected Data Transfer Length
24 -- 27
Command Seq. Num. (CmdSN)
28 -- 31
Expected Status Seq Num. (ExpStatSN)
32 - 47
SCSI Command Descriptor Block (CDB)
48 -- 51
or null
48 or 52
n+1 to to n
n+4
Header Digest (if Any) -- CRC32c
Data-Segment (if Any) - Command Data
Data Digest (if Any) -- CRC32c
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iSCSI Login

Two types of Login sessions



Normal login phases


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
Discovery (SendTargets)
Normal (after any discovery mechanism)
Security negotiation
Operational parameter negotiation
Full Feature (perform I/O)
Login uses text-based parameter negotiation


Syntax: key=value (or list of values)
Designed for extensibility
D-Link Europe DSN Storage Array Training – March 2010
iSCSI Security

Secure IP connection



Integrity, authentication, and confidentiality
Based on ESP (component of IPsec)
Authentication

Mutual Authentication (CHAP)


Integrity



Initiator to Target AND vice-versa
Cryptographic integrity, not just checksum or CRC
Linked to authentication to prevent regeneration attack
Authorization


iSCSI: Who can connect to which Target
LUN masking & mapping handled by SCSI, not iSCSI
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iSCSI Message Types
Protocol Data Unit (PDU)

Initiator to Target


NOP-out
SCSI Command




Encapsulates a SCSI
CDB
SCSI Task Mgmt Cmd
Login Command
Text Command

SCSI data


Target to Initiator


Output Data for Writes
Logout Command
NOP-in
SCSI Response

Can contain status

SCSI Task Mgmt Rsp

Login Response
Text Response
SCSI data


Including SendTargets
Used for iSCSI Discovery





Logout Response
Ready to Transfer


Input Data from Reads
R2T
Async Event
D-Link Europe DSN Storage Array Training – March 2010
iSCSI PDU Sequence
CMD PDU Write
R2T PDU
Data-Out PDU
Data-Out PDU
Cmd Rspse PDU, Status=good
iSCSI
Initiator
CMD PDU Read
iSCSI
Data-In PDU
Target
Data-In PDU ,Status=Good
CMD PDU Write , Immediate Data
CMD PDU Read
Data-In PDU, Status=Good
Cmd Response PDU , Status=Good
D-Link Europe DSN Storage Array Training – March 2010
iSCSI Adapter Options
iSCSI and
Software iSCSI
with TCP Off-load
TCP Off-load
SCSI Port to OS
SCSI Port to OS
SCSI Port to OS
iSCSI
TCP/IP
iSCSI
Adapter Driver
Adapter Driver
Adapter Driver
TCP/IP
TCP/IP
Ethernet
Ethernet
Ethernet
Media Interface
Media Interface
Media Interface
iSCSI with
Simple NIC
iSCSI with TOE
iSCSI HBA
Adapter Card
iSCSI
Host Processing
Software iSCSI
Copyright 2003 Storage Networking Industry Association. All Rights Reserved.
D-Link Europe DSN Storage Array Training – March 2010
iSCSI Multi-Pathing Mechanisms

Ethernet Link Aggregation or Trunking


Multiple TCP connections



Link layer (2), below TCP, transparent to iSCSI
In a single iSCSI session
Same or different Ethernet ports
Multiple iSCSI sessions


Multipathing software (e.g., MPIO) above iSCSI
Same or different hardware (e.g., Ethernet) ports
D-Link Europe DSN Storage Array Training – March 2010
Link Aggregation Support
DSN-2100
Application
DSN-5210
2 GbE
LAG
802.3ad
Direct-attach GbE
2x GbE LAG direct-attach w/switch
Trunking
DSN-5220
DSN-3200
2x
2 GbE
LAGs
8 GbE
LAG
802.3ad
802.3ad
2x servers w/2x GbE LAG direct-attach
1
8x GbE LAG direct-attach w/switch
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8
Multiple-Connection Support
Single-Session Multiple Connection per Session
MC/S
•
MC/S load balancing for a passive switch
•
MC/S can provide dynamic load balancing
•
MC/S can provide one or more paths to
storage
D-Link 8-port configurations maximize multiple
paths
MC/S (Multiple connections / session) support
is setup on servers and storage at the same
time providing incremental increases in
available bandwidth.
AP MC/S
1
2
C1 C2 C1 C2
Operating System support for MPIO, MC/S
1
MC/S AP
2
Connections
defined by
IP Address +
TCP Port #
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High-Availability Multi-Path
Servers and
storage provide
multiple
connections
MPIO
Layer
MultiPath
(MPIO)
Servers and Storage must support MPIO
Fault tolerance: Upon port or switch failure, IO
to the storage can be routed through an
alternate path
Multi-path solutions provide fully redundant physical
Fault-tolerant: MPIO will take the initiative to
switch to an alternate path
path components including NIC/adapters, cables and
switches, server and storage devices to create the
AP MPIO
MPIO AP
logical “path.” If one or more of these components
Load balancing can be provided on LUNs with
multiple sessions
fail causing a path failure, the MPIO driver will
Multi-gigabit ports can provide multiple dualpath configuration and/or multiple sessions
uninterrupted storage access.
redirect all I/O to use an alternate path allowing
D-Link Europe DSN Storage Array Training – March 2010
IP-SAN Pros and Cons

For:
 Runs over existing, ubiquitous Ethernet, TCP/IP fabrics.
 Internetworking built in
 Lots of fabric management tools
 IT folks understand TCP/IP
 Against
 TCP Slow Start impacts I/O latency, throughput
 Lossy fabrics impact I/O latency through re-transmission and
complicate receive endpoint data placement.
 Bridging to legacy FC SANs slow/expensive because of TCP
termination overhead.
D-Link Europe DSN Storage Array Training – March 2010
Fibre Channel over Ethernet (FCoE)



Enables interfacing with current FC infrastructure
Lossless Ethernet improves Quality of Service
Takes advantage of emerging 10G infrastructure and
pervasive Ethernet skill set
D-Link Europe DSN Storage Array Training – March 2010
SCSI Read/Write Example over FC
Host
Target
Host
FCP_C
MND
Target
FCP_C
MND
FCP_D
A
TA
Unsolicited data
(modest amount)
_
FCP
_
FCP
_
FCP
A
D AT
Exchange
FCP
A
D AT
A
D AT
_
FCP
R SP
SCSI Read
ER _
_ XF
RDY
FCP_D
A
TA
FCP_D
A
TA
Sequence (may
be out of order)
_
FCP
R SP
SCSI Write
D-Link Europe DSN Storage Array Training – March 2010
FCoE = lossless Ethernet
When port receive buffer
fills to a high watermark,
issue PAUSE XOFF to link
peer; when buffer drains to
low watermark, issue
PAUSE XON to peer
Switch or Endpoint
Eth Rx
Port receive packet buffer
Inbound
PAUSE
Inbound
PAUSE
Port transmit
buffer
Eth Tx
Switch or Endpoint
Ethernet
link
HWM
Outbound PAUSE generator
Eth Tx
Eth Rx
Outbound PAUSE generator
Port receive
buffer
LWM
Port transmit
buffer
D-Link Europe DSN Storage Array Training – March 2010
FCoE Pros and Cons

For:

Presents new but familiar PHY and Link Layers for FC
 Core switching discipline remains FC-SW-5
 Higher FC layers almost completely unchanged

Against:

Lossless fabrics are prone to congestion
 Ethernet-FC gateways with their different port speeds
are natural bottlenecks
 Heavy costs associated with:

FCoE or Converged Network Adapters (CNA)
 Implementing lossless fabric
D-Link Europe DSN Storage Array Training – March 2010
Storage Array Components
D-Link Europe DSN Storage Array Training – March 2010
HDD Interfaces - parallel → serial
ATA (IDE) for desktop computers is a point-topoint interface. Main disadvantages include
thermal and cable length.
SCSI supports up to 16 devices cascaded at
speeds up to 320MB
Serial topologies have effectively replaced parallel topologies due to the complexities of eliminating signal
cross-talk issues that affect both performance, scalability and reliability.
SATA (Serial ATA) is a point-to-point serial
interface technology supporting half-duplex
operations up to 3Gb/s.
SAS (Serial Attached SCSI) is a point-to-point
serial technology supporting full-duplex
operations up to 6Gb/s.
D-Link Europe DSN Storage Array Training – March 2010
HDD Storage Systems Evolution
2008
2009: SATA 2TB
2008: SATA 1TB
2006: SAS, 500G
2003: SATA, 100G
2000
1950
2003/iSCSI
1995/FC
2000: IBM Deskstar, 75GB
1999: Maxtor ATA, 10.2GB
1991: IBM ThinkPad, 1.2G
1997/Ultra ATA
1995/SCSI-3
1991/SCSI-2
1986: UC Berkley
RAID Paper
1990
1980
2006/SATA 2.5
2002/SAS 1.0
2001/SATA 1.0
1979: IBM 3370/2300M
1973: IBM 3340/140M
1983: IBM PC/XT
MFM Drives, 10M
1989/ATA
1986/SCSI-1
IBM #1
1968: Winchester HDD
1956: RAMAC HDD 5M
RAMAC
PC/XT
RAID
SCSI-1 ATA
FC SATA SAS iSCSI
D-Link Europe DSN Storage Array Training – March 2010
HDD Interface Overview
Type
ATA
SATA
SCSI
SAS
FC
Xmit Type
Parallel
Serial
Parallel
Serial
Serial
Addressing
2
1or16 (SATA II)
16
128
16M
Distance(M)
1
1
25
10
50km
Speed (MB/s)
100
150, 300, 600
160, 320
150, 300,
600
100, 200,
400, 1000
90 Pin
7 Pin
68 Pins
7 Pins
Copper/Fiber
Dual Port
No
No
NO
Yes
Yes
Topology
Bus
P-to-P
Bus
P-to-P
Loop, Switched
Duplex
Half
Half
Half
Full
Half/Full
2
1 or 15
Port Multiplier
16
4096 w/
expanders
Loop – 4096
Switched - 16M
ATA
ATA
SCSI
SCSI
SCSI
Ports
SAS
Max Conn
协议
20??
D-Link Europe DSN Storage Array Training – March 2010
Disk Drive Comparison
iStor Performance Benchmark
Disk Drive Baseline - 50% Capacity
ST3300655SS 15K SAS - ST3750630SS 7.2K SAS - ST31000340NS 7.2K SATA
Seagate ST3300655SS
Seagate ST3750630SS
Seagate ST31000340NS
340
275
155
155
125
123
117
93
Read
Write
IO/Sec (4K)
105
108
Read
101
Write
MB/Sec (128K)
D-Link Europe DSN Storage Array Training – March 2010
104
Typical Read/Write Data Path
Processor
decodes SCSI
command and
starts operation
TCP or iSCSI
engine moves
data to cache
2
1
6
IO to/from
HDD
3
The host transmits data to the target
device. The host interface Ethernet
(TCP/IP) interface decodes and processes
the packet. The layer also handles error
recovery such as re-transmission requests
due to packets errors (CRC, length, etc.)
Multiple touches of the
data is the primary cause
of poor performance
6
1
Interrupt
Processor
Host I/F
2
Cache
RAID
System
Cache
5
3
HDD
4
Memory, I/O Bus
4
Processor Cache
mechanisms to start
IO data movement
5
DMA engines used
to move data
to/from the cache
and HDD
The processor can touch the data several times during the processing of the iSCSI command consuming
resources and available bandwidth. TCP/IP offload engines have helped to significantly reduce the
bandwidth but processors are still directly involved with the setup of all hardware mechanisms to move
the data through the RAID system thereby consuming valuable memory bus bandwidth.
D-Link Europe DSN Storage Array Training – March 2010
Advanced SoC Technology
Network storage solutions have limited
performance and are comprised of a
motherboard, RAID cards, iSCSI or NICs
and storage virtualization software.
D-Link iSCSI IP-SAN Array
Single-chip SoC technology includes array
processors providing host network interface,
RAID features, HDD control and dualchannel features in a single chip
The only SoC in the iSCSI storage market
that supports both 1 Gb and 10 Gb networks
that provides a high performance, reliable
and cost effective solution.
D-Link Europe DSN Storage Array Training – March 2010
High Speed SoC Array Processor
Built-in 1GbE and 10GbE
iSNP8000
•Highest Gigabit port density
12 processor cores in the
•Direct
iSNP8000 SoC provides a
connect 8-port Gigabit
•No
costly switches required
parallel computing architecture
•No
costly HBAs
with a RAID processing unit for
•Simplified SAN
structure
High-Speed/Bandwidth Design
Storage / Network Array Processor
Up to 4GB of system memory for
high performance applications
Independent high-speed cache and
system memory to maximize the
overall performance.
best in class performance.
D-Link Europe DSN Storage Array Training – March 2010
Redundant Support – Zero Downtime
DSN-5220/DSN-5420 Dual Controllers
Active
Supports Hot-swappable controllers
Active-Passive provides no loss of
performance on hardware failure
Redundant controllers provide the
highest reliability and availability
10G Link
provides
zero latency
cache
coherency
Zero Down Time
Active-Active双机运作模式下
The 10G Reflective Memory Channel
(RMC) is a patented high-speed bus
providing low latency cache updates.
Upon a controller failure the surviving
Passive
controller will automatically take over
operations for zero downtime and
maximum in data security.
D-Link Europe DSN Storage Array Training – March 2010
xStack Virtualization
D-Link Europe DSN Storage Array Training – March 2010
Complete Virtualization
Complete Virtualization Includes Servers and Storage
Virtualized storage is managed at
the Storage Pool level


Virtualization



Make QoS decisions at volume
creation
Drives consolidated into one
available pool
Deploy new volumes efficiently
Manage storage resources
strategically
Fully utilize storage capacity
Virtualization
RAID 0 Volume
500 GB
End to End Virtualization
D-Link Europe DSN Storage Array Training – March 2010
Free Space
450 GB
RAID 1 Volume
100 GB
RAID 5 Volume RAID 10 Volume
300 GB
200 GB
48
Virtual Storage Approach
D-Link Europe DSN Storage Array Training – March 2010
Virtual Storage Benefits

Lower Cost





Unused Storage
Decreased management
requirements
Requires fewer disks
Less power
Uses full capacity of all disks
Higher Performance



6 disks
Vol 3
Unused Storage
6 disks
Vol 2
Optimized RAID level for
each application
Volumes can span all disks
Greater disk utilization
Shared Pool
Vol 3
Unused Storage
6 disks
Vol 2
Vol 1
Vol 1
Isolated Islands of Storage
Shared Virtual Pool
D-Link Europe DSN Storage Array Training – March 2010
12 disks
Virtual Storage Benefits

Ability to configure any combination of volume types;
no need to make any global decisions up front

Allows all of the available storage capacity to be
utilized without any wasted space

No need to pre-allocate drives to a specific storage pool

Ability to reconfigure any volume when needed; you
are not locked into anything

All volumes are on-line during any grow or reconfigure
operation
D-Link Europe DSN Storage Array Training – March 2010
Easy to Use Management




No RAID group pre-configuration simplifies resource planning
Create volumes in seconds
Pre-defined applications for volume creation
“On the Fly” RAID migration and volume expansion
D-Link Europe DSN Storage Array Training – March 2010
Simple Volume Creation
D-Link Europe DSN Storage Array Training – March 2010
xStack Performance
D-Link Europe DSN Storage Array Training – March 2010
Advanced iSCSI Storage Engine

Eliminates performance bottlenecks of traditional storage
architectures







True Storage Virtualization



Wire rate 10GbE or 8x1GbE
High transaction rates and bandwidth
H/W TCP/IP, iSCSI & RAID acceleration
Performance scales linearly with drive count
Utilizes performance capability of SSD drives
High Availability support [5 issued patents]
Storage pools provide device independence
Supports mixed device technologies: SAS/SATA/SSD
Low Power – 11 Watts

Enables high density architectures
D-Link Europe DSN Storage Array Training – March 2010
5
5
DSN xStack Base Architecture
Management
Processor
10 GE
PHY
OR
RGMII Interfaces
System Memory
iSNP8000
…
8 x GE
XGMII Interface
Buffer Memory
PHY
XGMII
Interface
10 Gb/s
Backplane
PHY
Redundant Memory
Channel
sATA/SAS
sATA/SAS
Controller
Controller
….
….
sATA or SAS
Drives
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack Throughput
Sequential Performance
1400
1160
1200
1000
896
800
Jumbo Frame
600
448
400
200
0
4 Port
8 Port
10Gb
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack 8-Port Performance
RAID-0 Sequential Read
MB/s
RAID-0 Sequential Write
MB/s
4 Volumes
4 Volumes
3 Volumes
3 Volumes
2 Volumes
2 Volumes
1 Volume
1 Volume
0.5K 1K
0.5K 1K
2K
4K
8K 16K
32K 64K 128K 256K 512K 1M
IO Transfer Size in Byte
4K
8K
16K
32K
64K
128K 256K
512K
IO Transfer Size in Byte
RAID-5 Sequential Read
MB/s
2K
1M
RAID-5 Sequential Write
MB/s
MB/s
4 Volumes
3 Volumes
2 Volumes
4 Volumes
3 Volumes
2 Volumes
1 Volume
1 Volume
0.5K
1K
2K
4K
8K
16K
32K 64K 128K 256K
IO Transfer Size in Byte
512K 1M
0.5K
1K
2K
4K
8K
16K
32K
64K 128K 256K
1M
IO Transfer Size in Byte
D-Link Europe DSN Storage Array Training – March 2010
512K
DSN xStack Transaction Rates
28K
84
D-Link Europe DSN Storage Array Training – March 2010
59
xStack Data Protection Features
D-Link Europe DSN Storage Array Training – March 2010
Non-Redundant RAID Support


JBOD

Acronym for “Just a Bunch Of Drives”

Stand-alone drive or concatenation of multiple drives (for a volume that is larger than a
single drive)

Just provides storage capacity; no data redundancy or performance improvements
Stripe (RAID-0)

Data is striped across two or more drives for improved performance (simultaneous I/O
across multiple drives)

Stripe is the same size on all drives

Total capacity is the stripe size times the number of drives

Volume is vulnerable to any drive failure; one drive failure will take the volume off-line

No rebuild is available in the event of a drive failure
D-Link Europe DSN Storage Array Training – March 2010
Redundant RAID Support



Mirror (RAID-1)

Data is mirrored across an even number of drives (complete copy)

Depending on which drives fail, a mirrored volume can sustain up to half of drives failing

Provides the maximum data protection, but consumes double the storage capacity

Rebuild will automatically begin onto other available drives (if sufficient capacity exists)
Parity (RAID-5)

Similar to RAID-0, but requires one additional disk for parity data

Volume can sustain one drive failure, and it will continue to be available (in reduced
mode)

Rebuild will automatically begin onto another drive, if sufficient capacity exists
Stripe-Mirror (RAID-10)

Combination of stripe (RAID-0) and mirror (RAID-1)

Depending on which drives fail, a mirrored volume can sustain up to half of drives failing

Provides the maximum data protection and performance

Rebuild will automatically begin onto other available drive(s), if sufficient capacity exists
D-Link Europe DSN Storage Array Training – March 2010
RAID Protected Virtual Volumes
RPV2: RAID Protected Virtual Volume
200GB
RAID-5
Disk
RAID 1
RAID 5
RAID 0
RPV2 automatically allocates 200GB space
Traditional RAID 5 Reconstruction
RPV2 rebuild of RAID-5 volume
RAID 1
HDD
Failure
RAID 5
RAID 0
Time-consuming reconstruction of entire
HDD capacity affecting performance
RPV2 rebuilds only active volumes saving
significant time
D-Link Europe DSN Storage Array Training – March 2010
Intelligent Data Protection
Intelligent Drive Removal (Down Drive)
I need
more
Capacity
!
SMART
Threshold
Exceeded
Down Drive
Down drive can be
used to move user
data from HDD prior
to failure avoiding
costly volume rebuild
Volume Micro Rebuild
The HDD may not
respond within the
timeout period due to
media defects.
HDD will automatically
revector media defects to
available space of the
disk
After successful data
migration the HDD is
automatically
removed from service
Down Drive and Micro-Rebuild are
proactive features that attempt to avoid
time consuming operations that affecting
system reliability and performance. These
intelligent data protection mechanisms
substantially improve system utilization.
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack Systems Overview
D-Link Europe DSN Storage Array Training – March 2010
D-Link IP-SAN Products
DSN-5220
DSN-5420
DSN-520
DSN-540
DSN-1100
DSN-5210
DSN-5410
DSN-5000
DSN-3200
DSN-3400
DSN-2100
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack Systems Overview



High-Performance IP-SAN Systems for the SMB Market

DSN-5410: 1 x 10GbE port with 12 SAS or SATA-II drives in a 2U enclosure

DSN-5210: 8 x 1GbE port with 12 SAS or SATA-II drives in a 2U enclosure

DSN-3400: 1 x 10GbE port with 15 SATA-II drives in a 3U enclosure

DSN-3200: 8 x 1GbE port with 15 SATA-II drives in a 3U enclosure

DSN-2100: 4 x 1GbE port with 8 SATA-II drives in a 2U enclosure

DSN-1100: 4 x 1GbE port with 5 SATA-II drives in a desktop enclosure
iSCSI Connectivity

Less costly and much easier to manage than Fibre Channel

Gigabit Ethernet infrastructure is readily available in all office buildings

Compatible with all major host platforms (Windows, Macintosh, Linux,
VMware, etc.)
Storage Virtualization

Ability to allocate volumes from a pool of available storage

No pre-configuration or pre-allocation is needed
D-Link Europe DSN Storage Array Training – March 2010
DSN-1100 Physical Characteristics
Power
button
Power and
Fault LED’s
Front View (with door closed)
Front View (with door open)
Rear View
iSCSI Data Ports
(4x1GbE ports)
Serial
Diagnostic
Port
Management
Ethernet Port
(10/100 Mbps)
D-Link Europe DSN Storage Array Training – March 2010
DSN-2100 Physical Characteristics
Power LED
Power LED
Fault LED
Front View (with bezel)
Fault LED
Front View (without bezel)
Rear View
Power and Reset
Switches
Hot-Swappable
Redundant AC Power
Supplies (2)
iSCSI Data Ports
(4x1GbE ports)
Management
Ethernet Port
(10/100 Mbps)
Serial Diagnostic Port
D-Link Europe DSN Storage Array Training – March 2010
DSN-3XXX Physical Characteristics
Power LED
Fault LED
Power LED
Front View (with bezel)
Fault LED
Front View (without bezel)
Rear View
Power and Reset
Switches
Hot-Swappable
Redundant AC Power
Supplies (3)
iSCSI Data Ports
(8x1GbE-ports shown)
Management
Ethernet Port
(10/100 Mbps)
Serial Diagnostic Port
D-Link Europe DSN Storage Array Training – March 2010
DSN-3XXX Physical Characteristics
Hot-Swappable
Redundant AC
Power Supplies (3)
Hot-Swappable
Cooling Fans (3)
Management
Ethernet Port
(10/100 Mbps)
iSCSI Data Ports
Internal View
(cover removed for clarity)
D-Link Europe DSN Storage Array Training – March 2010
DSN-5XXX Physical Characteristics
Power, Fault,
Ready LED’s
Front View
(Primary Array and Expansion Array)
Modular Design and Expandability
Primary Array with 12 drives and one or two RAID controllers
Dual Controllers provide High Availability in the event of a failure on one controller
Up to six (6) Expansion Arrays with 12 drives in each for a maximum of 84 drives
No need to add more RAID controllers as drives are added; performance scales linearly
D-Link Europe DSN Storage Array Training – March 2010
DSN-5XXX Physical Characteristics
Redundant power supplies (2)
Enclosure
Services
Module
Mute Audio
Alarm Button
Rear View – 8 x 1GbE
Secondary Controller
Primary Controller
Redundant power supplies (2)
Enclosure
Services
Module
Mute Audio
Alarm Button
Rear View – 1 x 10GbE
Secondary Controller
Primary Controller
D-Link Europe DSN Storage Array Training – March 2010
DSN-5XXX Physical Characteristics
RS-232 Serial
Diagnostic Port
iSCSI Network Ports
(8 x 1GbE shown)
Management Port
(10/100/1000Mbps)
SAS
Expansion
Ports (2)
Primary Array Controller
(shown with cover removed for clarity)
D-Link Europe DSN Storage Array Training – March 2010
DSN-5XXX Physical Characteristics
Redundant power supplies
Secondary I/O Module
Primary I/O Module
Expansion Array (rear view)
Connection from
Primary or Expansion
Array
Connection to
next Expansion
Array
Expansion Array I/O Module
D-Link Europe DSN Storage Array Training – March 2010
DSN-5XXX Redundant Controllers

Active / Passive

The primary controller services all system I/O

The secondary controller is constantly being updated, so its cache memory is
up-to-date, with no performance degradation

A failure on either controller will automatically transfer all network traffic to
the surviving controller, with no interruption to host I/O

If the primary controller fails, the secondary controller will send “gratuitous
ARP’s” from all network ports, to redirect host communication to the network
ports of the secondary controller

After replacing the failed controller it will automatically boot to return to a
fully-redundant state (v2.8 or later)
 Firmware updates are automatically applied to both controllers at the same
time



A system restart for dual-controller systems will be eliminated in an upcoming
firmware version
No performance degradation after a failover occurs
All volumes are always accessible, even after a failover
D-Link Europe DSN Storage Array Training – March 2010
Expansion Array Cabling (single controller)
Single-Controller
System
Primary Array
Blank-Off Plate
Drives
24-35
Blank-Off Plate
EXP-0
SAS to SAS Cable
Drives
12-23
Blank-Off Plate
HOST
EXP
EXP
Expansion Array #3
Expansion Array #4
Blank-Off Plate
Drives
36-47
Blank-Off Plate
HOST
Drives
72-83
Primary Controller
EXP-1
in Slot # 0
Drives
0-11
Expansion Array #1
Expansion Array #2
HOST
Drives
48-59
Mini-SAS to SAS Cable
HOST
EXP
EXP
Expansion Array #5
Expansion Array #6
Blank-Off Plate
Drives
60-71
Blank-Off Plate
HOST
EXP
D-Link Europe DSN Storage Array Training – March 2010
HOST
EXP
Expansion Array Cabling (dual controller)
Dual-Controller
System
Primary Array
Redundant Controller
in Slot # 1 EXP-1
Drives
24-35
Drives
48-59
HOST
EXP
EXP
HOST
EXP
EXP
HOST
EXP-0
HOST
EXP
HOST
Drives
12-23
EXP
HOST
EXP
HOST
Drives
36-47
EXP
Expansion Array #5
Expansion Array #6
HOST
Primary Controller
EXP-1
in Slot # 0
SAS to SAS Cable
Expansion Array #3
Expansion Array #4
HOST
Drives
72-83
EXP
EXP-0
Drives
0-11
Expansion Array #1
Expansion Array #2
HOST
Mini-SAS to SAS Cable
EXP
HOST
EXP
D-Link Europe DSN Storage Array Training – March 2010
HOST
Drives
60-71
EXP
Cabling Topology (dual controllers)
Network Switch
GbE Switch
To Host Servers
To Management Network
IMPORTANT: All network cables must be connected BEFORE a failover occurs
D-Link Europe DSN Storage Array Training – March 2010
Cabling Topology (dual controllers)
GbE Switch
GbE Switch
Host Server
D-Link Europe DSN Storage Array Training – March 2010
Compatibility


Total adherence to industry standards
Certified with leading applications

Choice of data protection applications


Use functionality included with operating system
Why this matters


Works with existing best-in-class storage system infrastructures
Manage advanced functionality with familiar tools
D-Link Europe DSN Storage Array Training – March 2010
8
1
DSN xStack Ecosystem
Hardware
Connectivity
OS/Applications
D-Link Europe DSN Storage Array Training – March 2010
Data Protection
82
Green Storage
Green Supply Chain
Low Power Consumption
D-Link
Smart Enclosures
12W
66W
RoHS = no hazardous substances
ISO14001 = pollution control and
improved energy efficiency
Other MFG 150W
300W
The industry‘s lowest power
consumption
Green Packaging
WEEE Compliant
Use of recyclable package material
Green Setup
Intelligent fan speed control
reducing noise in the IT room
Green Cooling Requirements
D-Link Green Storage
Very low power consumption
reduces cooling requirements
and the carbon footprint.
D-Link Green Switches
Green Technology
D-Link switches require 40% less
energy than competitive products
DSN products save energy
with feature/functions that
improve overall efficiency
Simplified WEB design enables
paperless operation
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack Management Center
D-Link Europe DSN Storage Array Training – March 2010
Getting Started

Java 6 Run-Time Environment
 Available from http://java.com

Launch any Internet Browser at the system
 Default IP address of 192.168.1.1
 Requires a host that can communicate on the 192.168.1.x subnet

Startup Wizard
 Walks you through the first-time system configuration





Alternative to the Startup Wizard
 Connect the RS-232 Serial Cable to the Diagnostic port





Password for the Administrative Login (default password of “admin”)
Management Port: IP Address, Network Mask and Gateway IP Address
IP Address for one or more iSCSI data ports
E-mail Notification (SMTP Server IP Address, STMP Server Port Number)
9600 bps, 8/N/1, no hardware handshake
At the Login prompt, login as “admin” with a password of “admin”
Select item “3” to set the out-of-band port configuration
Note: This method does not allow you to set the other parameters (network portals, admin password, etc.)
Other Setup Activities
 Launch Java GUI from Default Web Page
 Set the system date, time and time-zone
D-Link Europe DSN Storage Array Training – March 2010
Startup Wizard
Default IP
Address is
192.168.1.1
D-Link Europe DSN Storage Array Training – March 2010
Default Web Page
Click here
to launch the
Java GUI
D-Link Europe DSN Storage Array Training – March 2010
Java Management Center
Summary
Pane
Navigation
Pane
Details
Pane
Actions
Pane
D-Link Europe DSN Storage Array Training – March 2010
GUI Capabilities

Platform Independent
–
–

Runs on Windows, Linux, Solaris, or Macintosh platforms
Just need to install the Java 6 Run-Time Environment
Easy-to-Use
–
–
Navigation pane allows you to manage multiple systems with a single GUI
Four views



Volume View: shows all volumes, iSCSI initiators, and active iSCSI sessions/connections
Physical Storage View: shows all hard drives
System Administration View: shows current hardware and software revisions, Event Log,
etc.
 Network Settings View: shows the IP addresses, gateways, network masks for the
management port and all iSCSI data ports
–
–
–
–
Target names are automatically generated by the system
All volumes are presented on all network ports
Controlled access from a single host initiator, several initiators, or all initiators
Optional CHAP password authentication for additional access security
D-Link Europe DSN Storage Array Training – March 2010
GUI Capabilities


Volume Creation Wizard

Pre-Defined Recipes -- commonly used applications (e.g., file server,
web server, etc.)

Walk Me Through The Choices – selects the volume composition
based on answers to questions about performance and data
redundancy expectations

Advanced Mode – allows you to completely define all of the volume
characteristics
Down Drive

Provides the ability to systematically move all volumes off of a drive,
so it can be gracefully removed from the system

Allows drives to be replaced while the system is running, without ever
taking any volumes off-line

Used when replacing a smaller-capacity drive with a larger-capacity
drive, or when a drive is reaching the end of its useful life
D-Link Europe DSN Storage Array Training – March 2010
GUI Capabilities

Grow Volume
– Allows the capacity of a volume to be increased, while still
maintaining the existing volume composition
– The volume remains on-line during the grow operation
– Some additional effort will be needed on the host operating
system to increase the size of the file system

Reconfigure Volume

Allows you to change the volume composition (including RAID type,
drive selections, etc.)

Also allows you to increase the capacity, if desired

The volume remains on-line during the reconfiguration process

If the volume size was increased, some additional effort will be needed
on the host operating system to increase the size of the file system
D-Link Europe DSN Storage Array Training – March 2010
GUI Capabilities


Allocate Spare Drive

Provides the ability to reserve a drive as a “spare” that cannot be
used for creating new volumes

Volume rebuilds look for a spare drive of the same technology type
first (v2.7 and later)

If no spare drive is allocated, volume rebuilds will look for any other
available capacity
Create a Network Portal

Select Network Settings View
 Add Portal IP Address, Network Mask and Gateway IP Address to a
physical port
 Grant initiator access to the volume (default is “All Initiators”)
 Assign a CHAP password to the volume (optional)
D-Link Europe DSN Storage Array Training – March 2010
GUI Capabilities

E-mail Notification and SNMP Traps

Provides the ability to send an e-mail message when serious or
failure events occur



Requires an external SMTP (Simple Mail Transport Protocol)
server for e-mail notification
Provides the ability to send an SNMP (Simple Network Mgmt
Protocol) when serious or failure events occur (v2.7 and later)
Date, Time and Time-Zone Setup

You should set these during initial system installation

Ability to configure a third-party Time Server (NTP) such as
“time.nist.gov”
D-Link Europe DSN Storage Array Training – March 2010
Host System Configuration
D-Link Europe DSN Storage Array Training – March 2010
LAGs, MCS and MPIO

LAG (Link Aggregation Group)
 Link Aggregation allows for multiple Ethernet ports to be
combined to form one high-speed logical link to another
network device
 iStor LAG support is vendor unique so the switch MUST be
configured or network errors will occur
 Link aggregation works on a connection basis so overall
performance will not be realized unless the number of server
connections exceeds the number of data ports to the storage
Note: LACP is not supported. Switch must be manually configured
D-Link Europe DSN Storage Array Training – March 2010
LAGs, MCS and MPIO


MCS (Multiple Connections per Session)

MCS creates multiple connections within a single iSCSI session to
manage load balancing and path failover

The feature is similar to LAGs in that it links multiple Ethernet ports
to form a higher speed link to the network device

For increased performance, the Ethernet ports must be on separate
subnets (the round-robin algorithm is normally subnet centric)

MCS can improve performance without the need for LAGs in some
configurations
MPIO (Multi-Path IO)

MPIO creates two separate sessions to the iSCSI array to manage
load balancing and path failover

MPIO provides link redundancy for path failover

MPIO can be used in conjunction with LAGs
D-Link Europe DSN Storage Array Training – March 2010
Microsoft iSCSI Initiator Configuration

Latest version is 2.08

Use Persistent Targets to
automatically reconnect on reboot

Supports MPIO and MCS:

MPIO creates 2 separate sessions to
the iSCSI array to manage load
balancing and path failover

MCS creates multiple connections
within a single iSCSI session to
manage load balancing and path
failover
D-Link Europe DSN Storage Array Training – March 2010
iSNS (iSCSI Storage Name Service)

Modeled on Fibre Channel Nameserver


Scalable discovery and configuration management


Discovery domains (i.e., ability to separate resources)
Asynchronous notification of changes
Initiator retrieves all iSCSI target info from iSNS


Rich information repository (e.g., IPsec config info, etc.)
Central resource management
D-Link Europe DSN Storage Array Training – March 2010
iSNS Domains
iSNS is part of the
infrastructure or a specific
management server
Storage A
iSNS
Host A will
not discover
Storage B
Host A
Different Discovery Domains
Storage B
Host B
Host C
Host B and C
will not discover
Storage A
D-Link Europe DSN Storage Array Training – March 2010
Linux Configuration

After you have installed the open-iscsi Software Initiator you may
need to make some modifications
 Check the parameters in the Volume Advanced Settings for target
volume with the values found in the iscsid.conf file, and make
changes to the iscsi.conf file as needed
D-Link Europe DSN Storage Array Training – March 2010
Macintosh Configuration

Third-party iSCSI
initiators

GlobalSAN


Free iSCSI Initiator from
Studio Network Solutions
ATTO Technology

Not free…

Easy-to-Use
 Persistent Target support
 MCS support for path
redundancy
D-Link Europe DSN Storage Array Training – March 2010
VMware – Basic Configuration





Provides full path redundancy for a 3server configuration
For the IP-SAN, each ESX Server uses 2
network ports that must be teamed to
support path failovers (IP addresses in use
must be a single subnet)
The bandwidth between the ESX servers
and each switch is 3x the bandwidth
between the switch and the storage array
Applications that are heavy in I/O can
result in a high usage of processor 0
Significant improvement in performance
can be realized by setting the affinity of a
Virtual Machine to disallow processor 0
ESX Svr 1
Switch 1
ESX Svr 2
Switch 2
ESX Svr 3
D-Link Europe DSN Storage Array Training – March 2010
xStack
Storage
Array
VMware - High Bandwidth
Configuration

Provides full path redundancy and
maximum bandwidth for 3 servers
configured with a modest number of
VMware LUNs (aka: Volumes)
ESX Svr 1


The ESX Servers Virtual switches and
port groups are configured as described
in the Basic configuration
The storage controller is configured with
6 Network Portals (IP addresses) on one
subnet providing a balanced
configuration
Switch 1
ESX Svr 2
Switch 2
ESX Svr 3
D-Link Europe DSN Storage Array Training – March 2010
xStack
Storage
Array
VMware - LAG Configuration

Provides full redundancy, maximum
bandwidth and a balanced network load
for a 3-server configuration

The ESX Servers Virtual switches and
port groups are configured as described in
the Basic configuration
ESX Svr 1
Switch 1



The controller is configured with Link
Aggregation Groups (LAGs)
Each LAG has 3 Ethernet Ports and 1
Network Portal (IP address); only one
subnet is used
ESX Svr 2
Switch 2
ESX Svr 3
The LAG support is vendor specific so the
switch must be manually configured for
LAG support, sometimes called
“trunking”
D-Link Europe DSN Storage Array Training – March 2010
L
A
G
L
A
G
xStack
Storage
Array
Best Practice and Troubleshooting
D-Link Europe DSN Storage Array Training – March 2010
IP-SAN Best Practices

Host Servers



Use server-class NICs designed for storage applications
Use of Jumbo Frames can reduce the overhead on both your servers and
iSCSI targets; for end-to-end support, each device in the network needs to
support Jumbo frames including the NIC and Ethernet switches
Network Switches

Use non-blocking Ethernet switches and set the negotiated speed on the
switches
 Enable Flow Control on network switches and NIC/adapters
 Disable uni-cast storm control on iSCSI ports
D-Link Europe DSN Storage Array Training – March 2010
IP-SAN Best Practices

Network Infrastructure

Segregate IP-SAN and LAN traffic
 Minimizes

congestion and latency
Configure additional Paths for High Availability
 Use
OS MPIO or MCS (multiple connections per session)
 Additional NICs in the server create additional connections
 Redundant Ethernet switches for maximum redundancy


Use CAT6 rated cables for GbE Network Infrastructures
Use CAT6a or CAT7 for 10Gigabit installations
 required
for distances > 55 meters
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack Best Practices

Save a System Configuration File

Allows you to recover the system configuration in the
event of a controller replacement:

Network Portals, LAG’s, etc.

System Advanced Settings

Initiator access for all volumes

Avoids having to manually re-enter that information

A new System Configuration File should be saved after
making any configuration changes

In the System Administration View, select “Settings”
then select “Save”
D-Link Europe DSN Storage Array Training – March 2010
DSN xStack Best Practices


Always operate the system with a fully-charged
battery

Default behavior will change to “write-thru” mode when the
battery is charging or missing, which results in SLOWER
PERFORMANCE (unless you select “Ignore Battery Status”)

Battery may not be fully charged upon initial system
installation, so wait for the battery to become fully charged
before evaluating performance
Disable Windows Firewall during Firmware
Upgrade

The system will display a pop-up warning message if the
firewall is enabled

Firewall can be re-enabled after completing the firmware
upgrade
D-Link Europe DSN Storage Array Training – March 2010
System Troubleshooting Tools


Save Event History

Download the Event Log and other system information from the GUI

Select “Save Event History” from the System Actions pane

Forward the file named EventHistory.log to iStor Technical Support
System Diagnostic Capture

Active link on the Default Web Page to download the diagnostic capture from
each controller

Forward the captured file(s) to iStor Technical Support for analysis

256MB NAND Flash memory required


Older controllers may only have 128MB
Serial Console Output

Any error messages will be helpful

Version 2.7 (and later) will automatically include this information as part of
the System Diagnostic Capture
D-Link Europe DSN Storage Array Training – March 2010
System Troubleshooting Tips

Always have the customer save the event history when
requesting help

Required Information from the Customer:

Product Model
 Operating system
 General configuration (NIC, switch)
 Application


In some cases a capture of the serial console output may be
needed to resolve an issue
If customers using LAGs ensure the switch is
configured and flow control is enabled

Lack of proper switch configuration can result in poor
performance due to packet dropping
D-Link Europe DSN Storage Array Training – March 2010
System Troubleshooting Tips

Use of Jumbo Frames


The 4-port and 10G products support 9K frames. The 8-port
products support a 4K frame (remember switch and NIC must
also be configured).
Redundant Controllers require a Switch


The switch is required for path failover.
Management ports from BOTH controllers must be connected
to the network


The management ports are not connected internally so therefore
both must be connected to maintain communication on a failover
SATA supported on single controller ONLY

Installing a SATA drive in a dual controller system will cause a
‘Fail to Bind’ error on a boot or restart of the system.
D-Link Europe DSN Storage Array Training – March 2010
System Troubleshooting Tips

The customer can ping the management port but
cannot display the default web page


Have the customer lower the security level of the browser
Have the customer reboot if a volume has gone offline
due to a drive failure or drive removal




The system updates meta-data on the 1st drive failure to
remove that drive as a volume member
The system does not update meta-data when a drive failure
results in a volume offline state
A failed drive may stay operational long enough to copy the
data to another volume
If the wrong disk is removed causing the volume(s) to go
offline, re-insert the disk and then restart the system.
D-Link Europe DSN Storage Array Training – March 2010
System Troubleshooting Tips

Cannot bring up GUI from remote Host


E-mail notification not working



Must be able to ping mail server IP address from Management
Port.
Can use ‘Test’ button in Management Center
Host doesn’t recognize Volume



Host maybe on different subnet requiring a gateway IP
address for the management port.
Maybe due to 2TB limit (Linux/Vmware/XP)
Check access controls
Can ping Management port IP address but cannot
access GUI

Ensure system is ready (Ready/Fault LED)
D-Link Europe DSN Storage Array Training – March 2010
System Troubleshooting Tips

SAN

automatic File Sharing
File sharing software is required to manage multiple host
access to the same volume (MSCS, Vmware, etc.)
D-Link Europe DSN Storage Array Training – March 2010