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Solved
ReadyNAS 313 - 6.2.0 - Can't remove Snapshot
So I have a readynas that years ago was using snapshots. That Share is barely used now (One folder only). It says it has Zero snapshots but there is a snapshot with a c_2018_07_12__00_00_13 folder in...
Forcing the snapshot upgrade can only be done in 6.4.0 and later.
Anyway 6.2.0 was the first firmware with the new snapshots and was released many years ago. You shouldn't still be running firmware that old.
/data/Backup/.snapshots/1/snapshot is a new snapshot.
I've also tried
btrfs subvolume list -s /data/Backup
It lists
ID 13510 gen 953507 cgen 953507 top level 4416 otime 2018-07-12 00:00:14 path .snapshots/1/snapshot
So then I do
btrfs subvolume delete /data/Backup/.snapshots/1/snapshot
And I get cannot delete - Device or resource busy.
It is a very large structure of folders totalling ~2.5TB and I initially had two Readynas and planned to use RSYNC to sync between them across a WAN link for backup purposes but RSYNC couldn't copy even on Lan with the size of the share and just crashed (Long time ago, can't remember specifics but wouldn't work).
Perhaps its trying to do the Snapshot upgrade but not completing due to the size - I'll leave it a couple of days and check back but does anyone have any advice?
Forcing the snapshot upgrade can only be done in 6.4.0 and later.
Anyway 6.2.0 was the first firmware with the new snapshots and was released many years ago. You shouldn't still be running firmware that old.
/data/Backup/.snapshots/1/snapshot is a new snapshot.
Thanks for that info. At least I have a plan now. I’ll get the firmware updated after backing up the critical data.
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