Transcript THE EMC EFFECT/Template
THE EMC EFFECT
Building the ESN Infrastructure
EMC Enterprise Storage Network Doing business without barriers
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Agenda
Fibre Channel Basics Enterprise Storage Network (ESN) Introduction ESN Connectivity — Direct Connect — FC-AL Hubs — Connectrix Fibre Channel Director ESN Access Control — Zoning — Volume Logix Case Studies Page.2
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Fibre Channel Characteristics
High speed serial data transfer Unaware of content of information being transferred Simultaneously supports multiple protocols Potential connectivity of millions of devices Increases distance between devices Network that performs channel operations Page.3
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Fibre Channel
Channels Static Configuration Short Distance Single System Connectivity Fibre Channel High Performance Networks Dynamic Configuration Low Performance Multi-system Connectivity Low Protocol Overhead Extended Distance High Protocol Overhead Network that performs channel operations!
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Fibre Channel Architecture
A layered protocol stack similar to OSI FC0-FC2 provide transport services FC3 not currently implemented FC-4 provides encapsulation of other protocols FC4
SCSI HIPPI ESCON IP
FC3
COMMON SERVICES
FC2
FRAMING/FLOW CONTROL ATM
FC1
ENCODE/DECODE
FC0
12.5
MB/sec 25 MB/sec 50 MB/sec 100 MB/sec Future Higher Rates
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ANSI Fibre Channel Standards
Protocol Mappings (FC-4) — SCSI FCP Fibre Channel Protocol for SCSI-3 Physical Signaling (FC-0, FC-1, FC-2) — FC-PH Fibre Channel Physical and Signaling — FC-PH-2 Fibre Channel 2nd Generation Physical and Signaling — FC-PH-3 Fibre Channel 3rd Generation Physical and Signaling Topologies and Services — FC-FG Fibre Channel Fabric Generic — FC-AL Fibre Channel Arbitrated Loop — FC-AL-2 Fibre Channel 2nd Generation Arbitrated Loop — FC-SW Fibre Channel Switched Fabric Page.6
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Fibre Channel Classes of Service
Class 1 - dedicated connection, flow controlled, acknowledged Class 2 - connectionless, multiplexed, flow controlled, acknowledged Class 3 - connectionless, multiplexed, flow controlled, datagram Class F - inter-switch communications Class 4 - fractional bandwidth, quality of service, virtual channels Page.7
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Fibre Channel Topology Terms
Node - An end point in the network Link - A connection between two nodes Fabric - Multiple Fibre Channel switches interconnected and using Fibre Channel methodology for linking nodes and routing frames n a Fibre Channel network N_Port - Node port, a port at the end of a point-to-point link.
NL_Port - A port which supports the arbitrated loop topology F_Port - Fabric port, the access point of the fabric which connects to a N_Port FL_Port - A fabric port which connects to a NL_Port E_Port - Expansion port on a switch. Links multiple switches.
G_Port - A port on a switch with the ability to function as either a F_Port or a E_port.
GL_Port - A port on a switch with the ability to function as either a FL_Port or a E_Port.
HBA - Host Bus Adapter, the interface between the server bus and storage network.
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Fibre Channel Topologies
Point-to-Point - Dedicated link between two ports.
Fibre Channel Arbitrated Loop (FC-AL) - Shared interconnect between 2 to 126 nodes. Fibre Channel Switched Fabric (FC-SW) Dynamic connectivity between greater than 16 million nodes.
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Point-To-Point
N_Po rt N_Po rt
Dedicated full bandwidth connection two nodes No special protocol required to gain access to the link Basic fabric connection type Page.10
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FC-AL Hub
Physical star, Logical loop (FC AL) 2 to 126 nodes per loop Nodes arbitrate for control of the loop One full bandwidth circuit open at a time
NL_Po rt FC Hub NL_Po rt
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Switched Fabric (FC-SW)
Point-to-point connection between each node and the switch N x 100 MB/sec scaled bandwidth N/2 simultaneous full bandwidth circuits Greater than 16 million nodes per fabric EMC Connectrix!
N_Po rt F_Po rt FC Switch
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Fabric Services
Host SCSI-3 FCP SNS Switch Fabric Controller FCP Login Server Fabric Login (FLOGI) Fabric Login (FLOGI) Symmetrix FA SCSI-3 FCP Port Login (PLOGI) Simple Name Service (SNS) login supported by switch Buffer-to-buffer flow control between nodes and switch Fabric Controller routes frames between nodes Class 3 implemented today Page.13
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Fabric Zoning
Creates logical subsets of devices Devices can only “talk” to devices in the same zone Increases control of the fabric Zone 1 Zone 2 Page.14
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Switch versus Hub Comparison
SWITCHES HUBS • • • • FC-SW Architecture scaleable to millions of connections.
Bandwidth per device stays constant with increased connectivity.
Bandwidth is scaleable relative to connections.
Switch software includes robust capabilities for managing a topology.
• • • • FC-AL is limited to 127 devices. (substantially fewer connections can be implemented for ideal system performance).
Bandwidth per device diminishes with increased connectivity.
Aggregate bandwidth is NOT scaleable relative to connections.
Limited software management functionality.
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Data Flow Comparison
Hub (loop) - Nodes arbitrate for shared bandwidth.
Switch (fabric) - Full bandwidth on each link.
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Supported Media Types
Media Copper (Twinax) Multimode Fiber, 62.5 Micron Multimode Fiber, 50 Micron Singlemode Fiber, 9 Micron Distance 30 Meters 175 Meters 500 Meters 10 Kilometers Page.17
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Connectivity Evolution
REMOTE CAMPUS DATA CENTER
SCSI 25M ESCON / BUS & TAG 1990 1994 FC-AL (Direct Connect) 500M 1997 FC-AL HUB FC-AL 1998 SYMMETRIX 1 -- 11 KM FC-SW SWITCH FC-SW 1999
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