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Solved
Snapshot bug?
I'm doing a lot of housekeeping on my NAS which was rebuilt a week ago after file system corruption. I've been advised to keep as much free space available as possible and keep snapshots to a mini...
My second large data copy just completed and, after verification, I deleted the source data.
All my space was now made available, including the previous snapshot space. Snapshot space is now zero.
Problem solved I guess.
I've now deleted every snapshot from every share. I still have 826GB used by snapshots but my total snapshot count is zero.
Running OS 6.6.0, built on this version last week.
Just ran balance on the volume, it completed successfully but no snapshot space was cleared, I'm still missing 826GB.
My second large data copy just completed and, after verification, I deleted the source data.
All my space was now made available, including the previous snapshot space. Snapshot space is now zero.
Problem solved I guess.
I'm not sure what's going on with your snapshots, but I am wondering what ReadyNAS model you have (and if you have lifetime chat support). If so, you might want to use it - Netgear can likely fix this if they access your system remotely.
I've seen cases of very old snapshots getting lost from the web ui, and it is possible that you had an old snapshot like that on the share. That snapshot would still grow when you deleted files from the main share if those files existed when the snapshot was taken. If you have the space you could try copying the remaining files to a new share, and then deleting the original share (not the files, the share itself).
I did want to point out generally that since snapshots only take space when files are changed or deleted, snapshots of archival files cost nothing. A snapshot also protects against accidental deletion, so it's not completely pointless on an share that doesn't change.
If you are comfortable with ssh, you can copy the data to a new share without increasing space usage by using the --reflink option on the cp command. Deleting the original copy will still increase the snapshot usage though.
EDIT - this post crossed the OP's solution.
Thanks for the reply and suggestions StephenB, hopefully they'll help somebody else in future.
Obviously quite odd at this point, I went from disabling/deleting the snapshots to then having some kind of phantom snapshot when the original data was deleted.
I was copying the data from one share to another using the built in backup tool, which meant the source share was still internally busy copying the second bulk of data. Perhaps when the second job finished it was no longer in use and able to clear up better?
All guessing games but at least it is fixed.
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