Volume Shadow Copy High CPU Usage, Windows Server 2008 R2
Posted on 2011-10-04
I have done some searching around this site and the web in general and have not found any specific information on this particular issue.
I am running a Windows Server 2008 R2 Fileserver on a VM. It is configured with 1CPU, 4GB RAM and about 700GB of storage. There is no antivirus or backup software currently installed on the server. I enabled Volume Shadow Copy configured to take 4 shapshots a day at 2 hour intervals beginning at 11am.
This all worked great and smooth for a several months then all of a sudden we began getting major slowdowns and intermitent connection failures to the files for 5-15 minutes. After lots of digging throuogh logs and tweaking I finally narrowed it down to VSS. Those failures and slowdows perfectly coincide with shadow copy schedule. When the snapshot process starts it consumes all of my CPU and this disconnects users from their documents and they lose connection to their DFS mapped drives and their computers become extremely slow or unusable, etc. until the snapsop process is completed. This usually lasts about 5-10 minutes thought the effects to the employees workstations can last up to 20 minutes.
Can anyone tell me if there is a way to stop the process from taking up all my CPU resources during that time, outside of disabling Volume Shadow Copy altogether? It is necessary for our environment as we need the 2 hr file recovery period.
My next step to try would be allocating another CPU to its resources to see if that makes a difference but i would like to know if there is another solution before I try that.