Slow VM snapshot deletion on NFS volumes on ESXi hosts
Because VMware snapshots is always a topic for backups, I want to share my latest experiences with VM-snapshots on NFS. I had to troubleshoot a problem with system time within a VMware vSphere VM. During backup VM freezes for more than 30 seconds. When this happens, system time in VM also stops and resets to current time after the freeze. And this behavior causes massive problems in the application-layer. During troubleshooting we found a very slow VM snapshot deletion on NFS volumes on ESXi hosts.EnvironmentIn this setup, we were running:HPE SimpliVity Hyper-converged infrastructure running in current Version. Notice: SimpliVity uses NFS v3 to present volumes to their hosts. VMware vSphere 6.7 in quite current version. Current Version of Veeam Backup and Replication.SymptomsSlow VM snapshot deletion on NFS volumes on ESXi hosts. Snapshot removal of comparable VMs, running on block storage last about 1-2 seconds. Deletion of a snapshot, hosted on a SimpliVity volumes (NFS v3) lasts at