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Intermittent unavailability of an instance in a failover cluster while a standby node is offline.

Posted By:      Posted Date: October 10, 2010    Points: 0   Category :Sql Server

Hi everyone.

I've got a small failover cluster that I run for the websites my company has. During a RAM upgrade of the standby server, our websites started to show errors about not being able to access the database server. I verified that the instance was indeed up and the server accessable via remote desktop.
I also tried a SQL connection to it and it worked, but that might have been after it became available again.

This happened on and off until we were able to roll back the hardware changes that were in progress on the standby server and we were able to bring it back up.

There was nothing of interest in the SQL Server log, but there is a continous log for the whole duration of the problem, so there was no restart of the SQL Server service. The event viewer is of more interest, since it shows events relating to the heartbeat network card, but I don't know how that would affect the availability of the server, since the standby node is offline. I'd appreciate any help you can provide, it's not very redundant if it also depends on the standby server being up. :)

Here are the event logs from the time of the problem:

Level Date and Time Source Event ID Task Category
Information 4/23/2010 10:55:56 AM Microsoft-Wind

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