topic Re: aggregate - snapshot uses more space than reserved - how to delete? in ONTAP Discussions

aggregate - snapshot uses more space than reserved - how to delete?

fohringer0 — Thu, 05 Jun 2025 07:30:58 GMT

Hello Community,

How can i release "useded snapshot space on an aggregate?

df -A -g shows:

NASHEAD2> df -A -g
Aggregate                total       used      avail capacity
aggr0                    227GB      144GB       82GB      63%
aggr0/.snapshot           11GB      145GB        0GB     1221%

and aggr show_space shows

NASHEAD2> aggr show_space
Aggregate 'aggr0'

Total space WAFL reserve Snap reserve Usable space BSR NVLOG
278507008KB 27850700KB 12532812KB 238123496KB 0KB

Space allocated to volumes in the aggregate

Volume Allocated Used Guarantee
vol0 10632672KB 365404KB volume

Aggregate                       Allocated            Used           Avail
Total space                    10632672KB        365404KB      86998740KB
Snap reserve                   12532812KB     153013648KB   17039388348KB
WAFL reserve                   27850700KB         17348KB      27833352KB

But there is no snapshot on the aggregate - also snapshots are turned off:

NASHEAD2> aggr options aggr0
root, diskroot, nosnap=on, raidtype=raid4, raidsize=8,
ignore_inconsistent=off, snapmirrored=off, resyncsnaptime=60,
fs_size_fixed=off, snapshot_autodelete=on, lost_write_protect=on

So how can i release the "used space"?

On the aggregate is on volume (system volume)

NASHEAD2> df -L -g
Filesystem               total       used      avail capacity Mounted on
/vol/vol0/                 8GB        0GB        7GB       3% /vol/vol0/
snap reserve               2GB        0GB        2GB       0% /vol/vol0/..

Is there any help for me?

Re: aggregate - snapshot uses more space than reserved - how to delete?

chriskranz — Mon, 09 Feb 2009 22:33:13 GMT

Looks like there may be a locked snapshot for some reason. What does "snap list -A" show you?

The default should be to automatically delete aggregate snapshots as and when it needs to, but this might not clear down user created snaps, or locked snaps. "snap list -A" should show you these and there status.

Re: aggregate - snapshot uses more space than reserved - how to delete?

fohringer0 — Mon, 09 Feb 2009 22:54:45 GMT

Hi Chris,

snap list -A shows the following:

NASHEAD2> snap list -A
Aggregate aggr0
working...

No snapshots exist.

So there is actually no snapshot there ....

kind regards

Roman

Re: aggregate - snapshot uses more space than reserved - how to delete?

chriskranz — Mon, 09 Feb 2009 23:02:28 GMT

There is definitely something wrong there!

That snapshot usage would be imposing on your aggregate usable data, which I don't think it is. This may just be a bug with the display. What version of OnTap are you running and what's the system?

Re: aggregate - snapshot uses more space than reserved - how to delete?

fohringer0 — Mon, 16 Feb 2009 07:57:40 GMT

Sorry for the Delay,

I am Using "Data ONTAP Release 7.2.3"

Regards