Transcript AZR302 SQL Server Word Server Exchange Online SQL Azure Datacenter Spine TOR TOR TOR TOR TOR DLA Architecture (Old) Quantum10 Architecture (New) DC Router DCR Access Routers BL BL Aggregation + LB Spine AGG AGG L B L B L B 20Racks AGG L B AGG L B L B AGG L B L B 20Racks L B L B 20Racks TOR 20Racks TOR TOR TOR TOR TOR TOR TOR TOR TOR TOR TOR TOR TOR TOR Digi Digi Digi Digi Digi Digi Digi Digi Digi Digi Digi Digi Digi Digi 40 Nodes 40 Nodes 40 Nodes 40 Nodes 40 Nodes 40 Nodes 40 Nodes 40 Nodes 40 Nodes 40

AZR302
SQL
Server
Word
Server
Exchange
Online
SQL Azure
Datacenter
Spine
TOR
TOR
TOR
TOR
TOR
DLA Architecture (Old)
Quantum10 Architecture (New)
DC Router
DCR
Access
Routers
BL
BL
Aggregation +
LB
Spine
AGG
AGG
L
B
L
B
L
B
20Racks
AGG
L
B
AGG
L
B
L
B
AGG
L
B
L
B
20Racks
L
B
L
B
20Racks
TOR
20Racks
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
TOR
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
Digi
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
40 Nodes
APC
APC
APC
APC
APC
APC
APC
APC
APC
APC
APC
APC
APC
APC
…
…
…
BL
Spine
Spine
L
B
Digi
…
BL
AGG
L
B
TOR
…
Spine
DC Routers
DCR
…
…
40 Nodes
APC
TOR
…
TOR
TOR
Image Repository
Maintenance OS
FC Host
Agent
Fabric Controller
Windows
Azure
Parent
OS
Role
Role
Role
Role
Images
Images
Images
Images
Windows
Azure
Node
OS
Windows Azure Hypervisor
Windows
Deployment
Server
PXE
Server
Fabric Controller
US-North Central Datacenter
A(h, g) = C(h, g) / ∑ 𝐶 ℎ, 𝑔′ : 𝑔′ ∈ 𝐺
𝑋 𝑔 = 𝑚𝑖𝑛𝐴(ℎ, 𝑔)
ℎ∈𝐻
Role B
Worker Role
www.mycloudapp.net
Count: 2
Update Domains: 2
Size: Medium
www.mycloudapp.net
Load
Balancer
Physical Node
Guest
Partition
Guest
Partition
Guest
Partition
Guest
Partition
Role Instance
Role Instance
Role Instance
Role Instance
Guest
Agent
Guest
Agent
Guest
Agent
Guest
Agent
Trust boundary
Host Partition
FC Host Agent
Fabric Controller (Primary)
Image Repository (OS VHDs,
role ZIP files)
Fabric Controller (Replica)
…
Fabric Controller (Replica)
Role Virtual Machine
C:\
Resource Disk
Dynamic VHD
Windows VHD
Role VHD
OS Volume
Resource Volume
Role Volume
Guest Agent
Role Host
Role Entry Point
Virtual Disk Driver
Local RAM Cache
Local On-Disk Cache
Disk
Blob
Role Virtual Machine
C:\
OS Disk
RAM Cache
Local Disk Cache
D:\
Resource Disk
Dynamic VHD
E:\, F:\, etc.
Data Disks
FrontFrontEnd-1
End-2
max is 20
Middle
Middle
Tier-1
Tier-3
Tier-2
FrontEnd-1
FrontEnd-2
Middle
Tier-1
Middle
Tier-2
Middle
Tier-3
Update
Domain 1
Update
Domain 2
Update
Domain 3
Problem
Fabric Detection
Fabric Response
Role instance crashes
FC guest agent monitors role termination
FC restarts role
Guest VM or agent crashes
FC restarts VM and hosted role
Host OS or agent crashes
FC host agent notices missing guest agent
heartbeats
FC notices missing host agent heartbeat
Detected node hardware issue
Host agent informs FC
Tries to recover node
FC reallocates roles to other nodes
FC migrates roles to other nodes
Marks node “out for repair”
Guest Agent
Heartbeat
5s
25 min
Guest Agent
Heartbeat Timeout
10 min
Guest Agent
Guest
Agent
Connect
Timeout
Role Instance
Role
Instance
Launch
Indefinite
Role Instance
Load Balancer Load Balancer
Role Instance
Heartbeat “Unresponsive” Timeout Heartbeat
Timeout
15s
15s
15 min
30s
30s
Role
Role
Instance Instance
Start
Ready
(for updates only)
FrontEnd-1
FrontFrontEnd-2
End-2
Middle
Tier-1
Middle
Middle
Tier-2
Tier-2
Middle
Middle
Tier-3
Tier-3
Role B
Worker Role
www.mycloudapp.net
Count: 2
Update Domains: 2
Size: Medium
www.mycloudapp.net
Load
Balancer
Service B
Role A-1
UD 2
Service B
Role B-2
UD 2
Allocation 1
Allocation algorithm:
Prefer nodes hosting same
UD as role instance’s UD
Service B
Role A-1
UD 2
Service B
Role B-2
UD 2
Allocation 2
FrontEnd-1
FrontFrontEnd-2
End-2
Middle
Tier-1
Middle
Middle
Tier-2
Tier-2
Middle
Tier-3
expiredate.year = currentdate.year + 1;
Start
End
Date
Primary
Secondary
Backup1
Backup2
Friday, January 13 2012
11:00 AM
10:59 AM
densamo
gagupta
padou
anue
Saturday, January 14 2012
11:00 AM
10:59 AM
jimjohn
mkeating
chuckl
padou
Sunday, January 15 2012
11:00 AM
10:59 AM
anilingl
absingh
chuckl
padou
Monday, January 16 2012
11:00 AM
10:59 AM
sushantr
lisd
saadsyed
sushantr
Tuesday, January 17 2012
11:00 AM
10:59 AM
coreysa
ppatwa
ksingh
ritwikt
Wednesday, January 18 2012
11:00 AM
10:59 AM
wakkasr
soupal
ritwikt
padou
Thursday, January 19 2012
11:00 AM
10:59 AM
roylin
mkeating
anue
padou
Event
Date (PST)
Response and Recovery Timeline
Initiating Event
2/28/2012 16:00
Leap year bug begin
Detection
2/28 17:15
3x25 min retry for first batch hit, nodes start going to HI (cascading failure)
Phase1
2/28 16:00 – 2/29
05:23
New deployments fail initially and then marked offline globally to protect
clusters
Phase 2
2/29 02:57 – 2/29
23:00
Service management offline for 7 clusters (staggered recovery)
Host OS
Host
Agent
Application VM
Guest Agent
Public Key
Private
Key
Hypervisor
Host OS
Host
Agent
Application VM
Guest
Agent
Hypervisor
App VM
App VM
Guest
Agent
Guest
Agent
44
 Customer 1:
 Customer 2:
 Customer 3:
45
119 HA v2
119 GA v2
119 Networking
Plugin
119 OS
VM
119 GA v1
VM
VM
119 GA v1
119 GA v1
119 HA v1
119 HA v1
119 HA v1
119 Networking
Plugin
119 Networking
Plugin
119 Networking
Plugin
119 OS
119 OS
Network
119 OS
Network
118 HA
HA v2
118
v2
119 Networking
Plugin
118
OS
118 OS
VM
VM
VM
118 GA v1
118 GA v1
118 GA v1
118 HA v1
118 HA v1
119 HA v1
118 Networking
Plugin
118 Networking
Plugin
119 Networking
Plugin
118 OS
118 OS
Network
119 OS
Network
119 HA
HA v2
119
v2
119 Networking
Plugin
119 OS
119
OS
VM – 1
VM – 2
VM – 3
VM – 1
VM – 3
VM – 4
VM – 2
VM – 4
VM – 5
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118 HA v2
118 HA v2
118 HA v2
119 Networking
Plugin
119 Networking
Plugin
119 Networking
Plugin
118 OS
118 OS
Network
118 OS
Network
119
119
GA
GA v2
v2
VM – 1
118
GA
v1
VM – 2
VM – 3
VM – 1
VM – 3
VM – 4
VM – 2
VM – 4
VM – 5
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
119 HA v2
119 HA v2
119 HA v2
119 Networking
Plugin
119 Networking
Plugin
119 Networking
Plugin
119 OS
119 OS
Network
119 OS
Network
119
119
119
GA
v2
GA
GA v2
v2
VM – 1
VM – 2
VM – 3
VM – 1
VM – 3
VM – 4
VM – 2
VM – 4
VM – 5
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
118
GA v1
119 HA v2
119 HA v2
119 HA v2
119 Networking
Plugin
119 Networking
Plugin
119 Networking
Plugin
119 OS
119 OS
Network
119 OS
Network
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