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In a Microsoft Exchange 2007 Service Pack 1 (SP1) cluster environment, the System Attendant (SA) resource is not brought online or offline during a failover. When this problem occurs, the following events are logged in the Application log:
Log Name: ApplicationSource: MSExchangeSAEvent ID: 1031Task Category: GeneralLevel: ErrorKeywords: ClassicDescription:One of the System Attendant's task is blocked. Function: ScStopVM
Log Name: ApplicationSource: MSExchange ClusterEvent ID: 1020Task Category: ExResLevel: ErrorKeywords: ClassicDescription:Clustered Mailbox Server: <Server name>Physical Server: <Server name>Failed to bring the resource Exchange System Attendant Instance (xxxx) offline due to a timeout.
When the System Attendant resource goes offline, it tries to shut down any child tasks. One child task tries to contact all Public Folder servers in the top level hierarchy. If there are many public folder servers in the Exchange organization, this procedure takes a long time. Therefore, the SA resource times out. Because of this, the SA resource may stay in the "Offline Pending" state on the failed node of the cluster or it may stay in the "Online Pending" state on the node to which it is failing over.
To resolve this problem, install Update Rollup 9 for Exchange 2007 Service Pack 1. For more information about Update Rollup 9 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: