topic NDMP Backup and snapshot commvault in ONTAP Discussions

NDMP Backup and snapshot commvault

luciferHK — Wed, 04 Jun 2025 11:03:25 GMT

NetApp NDMP backup with commvault consuming more snap reserve space for large size volume and volumes that are undergoing frequent block level changes . Current protection is NFS =1 hr and iSCSI=3 days.

what would be ideal snapshot policy time to apply to handle write intensive application?

Can we use auto delete for snapshot? which that impact on backup?

Vol Dedup is not enabled. planning to enable this. hoping to reduce snapshot size.

Re: NDMP Backup and snapshot commvault

TMACMD — Sun, 28 Jun 2020 19:09:22 GMT

Enabling dedupe will only have an effect on active data, not those blocks that are protected by Snapshots. What I tell customers with large data sets changing is to minimize the Snapshot frequency when possible. Then figure out how long a dedupe run takes. Schedule the Dedupe run to run AND finish before the scheduled snapshot time. This will provide the best results. If the dedupe run take around 2 hours and if you take Snaps at 0800,1200 & 1600, maybe have the dedupe run at 0500, 0900 and 1300. That would capture most changes and be best in the Snapshots.

Autodelete may not be the best in this case. Most protections apps (like CommVault) take a snapshot and expect it to be there until it deletes it. If the autodelete removes a CV snapshot, it may get confused.

I am not familiar enough with CommVault to answer further.

Hope this helps at least a little.

Re: NDMP Backup and snapshot commvault

luciferHK — Mon, 29 Jun 2020 17:28:00 GMT

thanks for the suggestion. it helps..

Re: NDMP Backup and snapshot commvault

luciferHK — Tue, 30 Jun 2020 14:18:38 GMT

Have created this table to tackle snap reserve space usage. any comments?

Volume Size	Snap Reserve	Snapshot space	Description(disk type)
< 1TB	20%	200GB	High performance,General purpose storage
>1TB< 2TB	15%	300GB	High performance,General purpose storage
>2TB<5TB	5%	~250GB	General purpose storage,Utility storage
>5TB	5%	250GB	General purpose storage,Utility storage