Recently I encountered an issue with a client where VEAM backups were causing the DAG to fail over. This has led me to question whether or not VEAM is truly supported by Microsoft. I’ll need to scour for some Microsoft documentation to actually confirm. Either way, I digress as that is for another conversation in itself.
It seems that when VEAM is committing the snapshot the FCS sees the machine as down and in turn the DAG fails to the secondary site. In order to resolve this issue I have found that you must decrease the sensitivity of the FCS polling. This entails increasing the failure threshold as well as the frequency in which FCS polls.
You can set the maximum values via cmd prompt on the mailbox servers in question:
cluster /prop SameSubnetDelay=2000:DWORD
cluster /prop CrossSubnetDelay=4000:DWORD
cluster /prop CrossSubnetThreshold=10:DWORD
cluster /prop SameSubnetThreshold=10:DWORD
Let me know how this goes for you.
Denny
February 10, 2013 4:09 amHi ,
This is Denny, the creator of this free automated employee
provisioning/termination app– Z-hire. I wrote this app for the TechNet community a year ago.
Since you run a very informative blog, I would like your help
spread the word. Since my application is free, i need supporters from the
community. It would means a lot if you can help.
Here is a link to my app
http://gallery.technet.microsoft.com/Z-Hire-Employee-Provisionin-e4854d6b
Thanks
Denny