I have a 2x4TB mirror disk pool.
Within this pool, there's an SMB shared dataset called "Syncback".
If I check the size of this dataset on Windows, it's around 1TB.
If I check the size on TrueNAS, it's 2.44TB.
Less than a month ago, the pool usage was at 30%; today it's at 70%.
2.44TB to store 1TB of usable data seems excessive.
Could you please help me? I'm not a ZFS expert.
I suspect the "snapshots" are the issue.
At this rate, the pool is going to explode.
Seeing that this behavior is not normal, I suggest you take a look at your snapshot retention policy first, then compare retained snapshots vs. the policy you set, then come back here and let us know what you found.
On the Periodic Snapshot Tasks page there should be a button “Snapshots”. This will open the page with all of your snapshots on the system, not just the ones shown. If you have any apps installed or ever installed, then snapshots were created that have a retention policy of Keep. This happens every time an app is updated. there may also be other snapshots retained and they should show there. You have to occasionally clear these snapshots out.
Also some backup methods may create a new full backup if a directory is changed leaving the old directory orphened which will silently eat space.
Thanks.
It works.
1 Like