We are a long time SnapCenter user, and have not had this issue before, so we suspect upgrade to 5.0 or 5.0P1 to be a play here...
Basically we get a failed backup of our SQL servers because it has exceeded the number of snapshots allows (1023) on our snapinfo volume... We have a very simple policy of Full DB backup with log daily, where we haev set the retention to: "Keep log backups applicable to last 14 days" and "Keepp Snapshot copies for 14 days"... we also run log only backups every hour. So in my mind this should result in 14 days times 24 snapshots = 336 snapshots, and not 1000+ 🙂 Not sure if SnapCenter cleans up as part of the backup job (but I think so), or it it has a "cleaup job" that runs at a part of the "Purge jobs" thing?
#Way too many snapshots... :-)
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Ahh SnapCenter... what a funny product to work with... We think we found the main cause of this issue... it was of cause due to the fact we have upgraded, and some API broke so we had to put a line in the snapcenter configuration file on the SnapCenter server... "<add key="IsRestEnabledForStorageConnection" value="false" />" So NetApp in their visdom choose to use the REST API which must be broken some how... because the result in this setup was that it could create plenty of snapshots etc.. but didn't clean up the snapshots... or at least this is the throry right now... we came across this KB because we had some "Log Backup Retention of Resource Group" jobs that was unable to run due to timeouts... strangely this job isn't to be found anywhere on the systems.. searched anythere on the filesystem for a joblog with the job ID.. but nothing... we had these jobs for every resource group and we had them every hour going back several days... all in a warning state... after we applied the above key to the SnapCenter server, they were gone... not even a "Completed" version or anything... Not sure if this is something that is just ran in the background and not shown in the logs other than if it fails?
Holy wall of text batman.