Reason for Exchange cluster failover

Hi

I'm running Exchange 2007 SP2/Windows 2008 Server in Active-Passive SCC cluster.

Node1: Exchp1.domain.com
Node: Exchp2.domain.com
CMS: ExchCMS.domain.com

Last night, the CMS failed over from P1 to P2 it seems. I notice that because when I connected to ExchCMS this morning, I connected to P2.

I think there were some performance issues on the P1 server, but I'd like to know what actually caused the CMS to fail over? Is there a certain criteria? And what would we look for in the Event Log to show what caused it?
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kam_ukAsked:
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AmitIT ArchitectCommented:
Check system logs, if you see any errors or warning related to cluster failed. Secondly i would check below

What time did the failover occur?
Has other cluster nodes failover in the past week?
Was there any type of business related operations/maintenance being performed when the failover occurred?
Is there any change control process implemented?
Was there other symptoms before the failover occurred?
Client latency?
Queue buildup?
Unexpected database/transaction log growth?
Network related issues?
Unexpected process terminations?
Performance related (VM Fragmentations, Non-Paged Pool depletions, High RPC, etc…)

Some of the common causes of a cluster failover are:
Server performance
Unexpected process termination
Unresponsive process(es)
Disk subsystem latencies
Anti-Virus configuration
Network changes

Check Cluster.log for more information
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AmitIT ArchitectCommented:
Found an article. Please check it. It is related to SCC

http://technet.microsoft.com/en-us/library/bb397217(EXCHG.80).aspx
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kam_ukAuthor Commented:
Hi

So we may have had high load on the active node before the failover. In your answer above, you say:

>>>Some of the common causes of a cluster failover are:
Server performance
Unexpected process termination
Unresponsive process(es)
Disk subsystem latencies
Anti-Virus configuration
Network changes

Is there a log or Event ID anywhere that will tell me which one of these caused the CMS to fail over to the passive node?
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AmitIT ArchitectCommented:
Check the System Logs. You might see the warning and error messages during that time, when failover was happened.
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