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Exchange 2010 cluster issue

Posted on 2015-02-22
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Last Modified: 2015-02-24
Hi Experts,

I have recently started to receive issue with our exchange 2010 DAG, one of the primary site DAG member server which is holding the active DB copy move the DB to another member server in the primary site.

DAG Member : Primary Site: Server01(DB01,DB02), Server02(DB03,DB04)
Secondary site: Server04 (DB01,DB02,DB03,DB04) passive copy

As part of the investigation, notice that Windows service 'ClusSvc' is stopped and the server which is moving the active DB copy is doing the v-motion during that time and causing the cluster service to fails and move the DB.

I have found that Vmware has article addressing the Microsoft Failover Cluster for Exchange best practices by adjusting Samesubnetdelay to two seconds and keeping the SameSubnetThreshold to 5, which gives a 10 seconds threshold heartbeat.

http://www.vmware.com/files/pdf/using-vmware-HA-DRS-and-vmotion-with-exchange-2010-dags.pdf


Could you please advise how can I  investigate how many seconds the Exchange box lost the network connectivity during the Vmotion, does the Cluster log  helps to identify? and adjusting Samesubnetdelay to two seconds and keeping the SameSubnetThreshold to 5, which gives a 10 seconds threshold heartbeat, will that help. Please advise.
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Question by:ipsec600
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4 Comments
 
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Assisted Solution

by:Amit
Amit earned 100 total points
ID: 40625728
I saw the pdf document and VMware is recommending to use 2 second and MS recommend max 10 second, so I don't see any issue in changing it to 2 sec as VMware recommending. I suggest implement and see if that resolve the issue or not.
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Veerappan Sundaram earned 200 total points
ID: 40625810
This is know issue with VMware and Exchange 2010 cluster service. First, check the underlying hardware platform bottlenecks - instead of adjusting the threshold. If you do not have any option to fix the hardware layer performance bottleneck, then you have to think about modifying the thresholds.
VMware logs should give you a clear indication for the V-motion.
If the problem is at hardware platform level, then cluster logs will have the information about disk/network response latency.

Thanks,
Veera.
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LVL 19

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by:Adam Farage
Adam Farage earned 200 total points
ID: 40626156
Could you please advise how can I  investigate how many seconds the Exchange box lost the network connectivity during the Vmotion

You are doing a cold boot when the vmotion is done? Doing a live vmotion is not supported by Microsoft and can cause some issues.
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by:ipsec600
ID: 40628233
Thanks Guys for the clarification.
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