I've got 2 FAS 2220 with 8.1.1 7-mode.
I activated asynchronous snapmirroring (on nfs_logs) , and it's working fine, but I can see that agregate free space is going down.
The first time (before snapmirroring), the output was like it:
aggr show_space -h
Total space WAFL reserve Snap reserve Usable space BSR NVLOG A-SIS Smtape
24TB 2479GB 0KB 21TB 0KB 0KB 0KB
Space allocated to volumes in the aggregate
Volume Allocated Used Guarantee
vol0 173GB 4258MB volume
nfs_logs 21TB 105MB volume
Aggregate Allocated Used Avail
Total space 21TB 4363MB 626GB
Snap reserve 0KB 0KB 0KB
WAFL reserve 2479GB 18GB 2460GB
vol0 173GB 4653MB volume
nfs_logs 21TB 8425MB volume
Total space 21TB 12GB 614GB
Snap reserve 0KB 11GB 0KB
I dont't understand why snap reserve is growing, because agregate scheduling isn't working:
snap sched -A
Aggregate aggr0: 0 0 0
See The Solution
All is ok now, no more agregate snapshots arre generated.
Thanks you Said.
View solution in original post
Could you give ; df -Ah and snap list -A
Hello Said, this is the output:
Aggregate total used avail capacity
aggr0 21TB 21TB 614GB 97%
aggr0/.snapshot 0GB 11GB 0GB ---%
snap list -A
%/used %/total date name
---------- ---------- ------------ --------
17% (17%) 0% ( 0%) Nov 30 09:00 hourly.0
20% ( 4%) 0% ( 0%) Nov 30 00:00 nightly.0
22% ( 4%) 0% ( 0%) Nov 29 19:00 hourly.1
25% ( 3%) 0% ( 0%) Nov 29 14:00 hourly.2
27% ( 4%) 0% ( 0%) Nov 29 09:00 hourly.3
Could you verify the date at which you disabled the aggragat snap sched ?
Is there any script taking this snap ?
If no , delete this snap and observe what is going to take place.
I disabled agregate snap sched on Nov 30, to see if agregate snapshots will be the same size in the future or not.
But i noticed that it was the same problem and agregate snapshot are using more and more space, so the agregate free space is goig down, whereas no agregate scheduling is active.
Snapshots keep track of the blocks that have changed between snapshots and the current filesystem. The changes introduce to a filesystem can increases the snapshot size.
If you dont' need those snap, delete them.
I deleted all existing agregate snapshots, I'll see tomorow if somme agregate snapshots will be generated or not.
I hope "no".
Also note that when you delete aggregate snapshots, not all blocks are freed immediately. There's a WAFL scan running to reclaim the freed aggregate blocks ... This may distort any "df -A" or "aggr show_space" figures you look at.
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