Issue in hyper-v backup.

Hello,

We are facing some issue with veritas for our hyper-v 2012 infrastructure. we take full vm backup and incremental backup.

We have 10-12 VM's per hyper-v and backup schedules full and weekly incremental. Backup job's get fail if we take backup of all vm's in one job and in other hand if take backup of individual VM's that get completed successfully. while failing logs come show vss writter failing. but vss writters are running and all are stable.

also, sometime veritas creates hyper-v checkpoint and setting for checkpoints is disable in hyperv. Please help us in troubleshooting this issue.

Thanks,

sam