Calculate snapshot occupied space in snap reserve

gaurav_verma — Thu, 05 Jun 2025 05:46:01 GMT

Hello People

I am looking for formula or tool to calculate snapshot size by single snapshot in the snap reserve area.

For example

In volume dfs1, 3621 MB is occupied by snapshots in total 50GB snap reserve.

filer01> df -h dfs1

Filesystem total used avail capacity Mounted on

/vol/dfs1/ 200GB 143GB 56GB 72% /vol/dfs1/

/vol/dfs1/.snapshot 50GB 3621MB 46GB 7% /vol/dfs1/.snapshot

filer01c> snap list dfs1

Volume dfs1

working...

%/used

%/total date

name

---------- ---------- ------------ --------

0% ( 0%)	0% ( 0%) Jan 08 00:00 nightly.0
0% ( 0%)	0% ( 0%) Jan 07 20:01 hourly.0
0% ( 0%)	0% ( 0%) Jan 07 16:01 hourly.1
0% ( 0%)	0% ( 0%) Jan 07 12:00 hourly.2
0% ( 0%)	0% ( 0%) Jan 07 08:00 hourly.3
0% ( 0%)	0% ( 0%) Jan 07 00:00 nightly.1
0% ( 0%)	0% ( 0%) Jan 06 20:01 hourly.4
0% ( 0%)	0% ( 0%) Jan 06 16:00 hourly.5
0% ( 0%)	0% ( 0%) Dec 17 00:00 filer03a(0151742962)_vfiler04a_dfs1_ccbudemo-src.1623 (snapmirror)
2% ( 2%)	1% ( 1%) Nov 27 07:55 filer01c(0101189678)_dfs1_FAST-AMS-dst.5964
2% ( 0%)	1% ( 0%) Nov 27 07:55 filer01c(0101189678)_dfs1_ccbudemo-dst.6404

Snapshot "filer01c(0101189678)_dfs1_FAST-AMS-dst.5964" is occupying some space out of 3621 MB but how much? I remember there used to be a formula to calculate space used by a snapshot based upon 2% and 1% and total volume capacity (or total snap reserve) but I can not recollect it now.

I am not looking for snap delta calculation but the actual space occupied by snapshot.

Thanks

Gaurav

Re: Calculate snapshot occupied space in snap reserve

aborzenkov — Wed, 08 Jan 2014 14:27:07 GMT

Closest to "space occupied by snapshot" is "snap reclaimable".

topic Calculate snapshot occupied space in snap reserve in ONTAP Discussions

Calculate snapshot occupied space in snap reserve

Re: Calculate snapshot occupied space in snap reserve