Dell Storage Manager 2020 R1 Administrator's Guide

Description	Snapshot creation and deletion fails.
Cause	Probable causes might be: There are many client I/O requests waiting to be serviced, including a request to remove a large directory. There are many snapshot creation/deletion requests being currently processed. Another snapshot request for the NAS volume is currently being executed. The total number of snapshots reached the system limit. The wrong IP address was specified in the backup job.
Workaround	For a manual request failure, retry taking or deleting the snapshot after a minute or two. If the request originated from the snapshot scheduler, wait another cycle or two. If the failure persists, try taking or deleting the snapshot manually on the same NAS volume. If the system is under a heavy workload, wait until the workload decreases and reissue the snapshot request. Check the snapshot schedule. A very dense snapshot schedule has a negative impact on the overall performance of the system. The accumulated snapshot rate must not exceed 20 snapshots per hour per system. Check the total number of snapshots in the system. If the number is in the thousands, delete a few snapshots and retry. Ensure the client VIP is specified in the backup job. Check if a recent delete of a big volume (TB) was executed. If so, wait for some time and retry the activity.

Troubleshooting Snapshots