Exchange Server 2010 SP2 High Availability Deep Dive Scott Schnoll Principal Technical Writer Microsoft Corporation

Deep Dive Code changes in Service Pack 2 (SP2) and Update Rollup 3 for SP2 Recent Behavior Changes

High Availability Concepts

Deep Dive Database Availability Group Networks

Server / Network IP Address / Subnet BitsDefault Gateway EX1 – MAPI / EX1 – REPLICATION /24N / A EX2 – MAPI / EX2 – REPLICATION /24N / A NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork /24EX1 ( ) EX2 ( ) True DAGNetwork /24EX1 ( ) EX2 ( ) FalseTrue

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork /24EX1 ( )True DAGNetwork /24EX1 ( )FalseTrue DAGNetwork /24EX2 ( )True DAGNetwork /24EX2 ( )FalseTrue Server / Network IP Address / Subnet BitsDefault Gateway EX1 – MAPI / EX1 – REPLICATION /24N / A EX2 – MAPI / EX2 – REPLICATION /24N / A

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork /24EX1 ( )True DAGNetwork /24EX1 ( )FalseTrue DAGNetwork /24EX2 ( )True DAGNetwork /24EX2 ( )FalseTrue Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork01 -Subnets , ReplicationEnabled:$false Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork02 -Subnets , Remove-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork03 Remove-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork04

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork /24EX1 ( )True DAGNetwork /24EX1 ( )FalseTrue DAGNetwork /24EX2 ( )True DAGNetwork /24EX2 ( )FalseTrue Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork01 -Subnets , ReplicationEnabled:$false

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork / /24 EX1 ( ) EX2 ( ) TrueFalse DAGNetwork /24EX1 ( )FalseTrue DAGNetwork03 DAGNetwork /24EX2 ( )FalseTrue Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork01 -Subnets , ReplicationEnabled:$false

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork / /24 EX1 ( ) EX2 ( ) TrueFalse DAGNetwork /24EX1 ( )FalseTrue DAGNetwork03 DAGNetwork /24EX2 ( )FalseTrue Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork01 -Subnets , ReplicationEnabled:$false Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork02 -Subnets ,

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork / /24 EX1 ( ) EX2 ( ) TrueFalse DAGNetwork / /24 EX1 ( ) EX2 ( ) FalseTrue DAGNetwork03 DAGNetwork04

Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork01 -Subnets , ReplicationEnabled:$false Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork02 -Subnets , Remove-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork03 Remove-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork04 NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork / /24 EX1 ( ) EX2 ( ) TrueFalse DAGNetwork / /24 EX1 ( ) EX2 ( ) FalseTrue DAGNetwork03 DAGNetwork04

NameSubnet(s)Interface(s)MAPI Access Enabled Replication Enabled DAGNetwork / /24 EX1 ( ) EX2 ( ) TrueFalse DAGNetwork / /24 EX1 ( ) EX2 ( ) FalseTrue Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork01 -Subnets , ReplicationEnabled:$false Set-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork02 -Subnets , Remove-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork03 Remove-DatabaseAvailabilityGroupNetwork -Identity DAG2\DAGNetwork04

Blocked Allowed Subnet 3 Subnet 4 Subnet 2 Subnet 1 M M MM R RRR

Deep Dive Active Manager

Deep Dive Best Copy Selection

CriteriaCopy Queue LengthReplay Queue LengthContent Index Status 1< 10 logs< 50 logsHealthy 2< 10 logs< 50 logsCrawling 3N / A< 50 logsHealthy 4N / A< 50 logsCrawling 5N / A< 50 logsN / A 6< 10 logsN / AHealthy 7< 10 logsN / ACrawling 8N / A Healthy 9N / A Crawling 10 Any database copy with a status of Healthy, DisconnectedAndHealthy, DisconnectedAndResynchronizing, or SeedingSource

Database CopyActivation Preference Copy Queue Length Replay Queue Length CI StateDatabase State Server2\DB1240Healthy Server3\DB1322HealthyDiscAndHealthy Server4\DB14100CrawlingHealthy DB1 Server1 Server2 Server3 Server4 DB1 X

Database CopyActivation Preference Copy Queue Length Replay Queue Length CI StateDatabase State Server2\DB1240Healthy Server3\DB1322HealthyDiscAndHealthy Server4\DB14100CrawlingHealthy

Lowest copy queue length – tried first Database CopyActivation Preference Copy Queue Length Replay Queue Length CI StateDatabase State Server2\DB1240Healthy Server3\DB1322HealthyDiscAndHealthy Server4\DB14100CrawlingHealthy

DB1 Server1 Server2 Server3 Server4 DB1 X Database CopyActivation Preference Copy Queue Length Replay Queue Length CI StateDatabase State Server2\DB1240Healthy Server3\DB1322HealthyDiscAndHealthy Server4\DB14100CrawlingHealthy

Database CopyActivation Preference Copy Queue Length Replay Queue Length CI StateDatabase State Server2\DB1240Healthy Server3\DB1322HealthyDiscAndHealthy Server4\DB14100CrawlingHealthy

Lowest preference value – tried first Database CopyActivation Preference Copy Queue Length Replay Queue Length CI StateDatabase State Server2\DB1240Healthy Server3\DB1322HealthyDiscAndHealthy Server4\DB14100CrawlingHealthy

Deep Dive The MommyMayIMount Bit Datacenter Activation Coordination Mode

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