Posted by Finally there are hotfixes for the annoying CSV IO Paused during the back-up. The issue mostly occurs when multiple CSV VSS Snapshots are initiated. I’ve tested the hotfixes in my test envoirement and the issues seems to be gone now.
The components:
KB3090343 https://support.microsoft.com/en-us/kb/3090343
Component: Clussvc.exe
Resolves an issue when multiple VSS backups are in progress, the cluster service may crash because of inconsistent state in the CSV VSS provider.
KB3060678 https://support.microsoft.com/en-us/kb/3060678
Component: Volsnap.sys
Resolves an issue where unneeded snapshots may not be deleted after a backup is completed. This prevents future backups from failing due to a lack of free space consumed by snapshots.
KB3063283 https://support.microsoft.com/en-us/kb/3063283
Component: Hyper-v Integration Services
Increases the time-out to detect the volumes to shadow copy when the Guest OS has multiple volumes.
KB3072380 https://support.microsoft.com/en-us/kb/3072380
Component: Rdvgpuinfo.dll / Vmms.exe
Resolves an issue on a Hyper-V cluster where the heartbeat component times out during a long-running snapshot. The snapshot fails and the VM restarts.
The full list of Microsoft Cluster Hotfixes:
https://support.microsoft.com/en-us/kb/2920151