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ReadyNAS 316 out of memory during Balance
ReadyNAS 316 6.9.2 RAID 5
Had a 11TB Lun with 1.7TB free space / 2 recent snapshots using about 5.7TB
Seemed like the snapshots were taking up a lot of space so I ran a Balance operation to see ...
I just want to follow up with my solution in case this helps anyone in the future. My data was intact on the iSCSI target and I disabled snapshots. I was unable to delete the existing snapshots through the web interface so my available space was still less than 20%. I used btrfs commands to find and delete those snapshots, rebooted and I am happy to report I have recovered all the space formerly used by the snapshots. The NAS has been stable and running for several weeks now. I appreciate the advice I was provided here and I found my solution from reading some of the other community posts.
You do need to be careful when using snapshots with iSCSI LUNs. There's very limited situations in which using them would be advisable.
A balance is not going to make snapshots use less space. All a balance does is move around data and metadata to empty chunks.
Also balancing works best when the volume usage is below 85%.
With 5.7TB consumed by recent snapshots the LUN must be changing very significantly. This could be e.g. due to running a defrag of the filesystem on the LUN (e.g. if you're using the Microsoft Initiator in Windows, I'd suspect you may have run a defrag of the NTFS filesystem on the LUN using Windows). Another possibility would be modifying/adding/deleting a huge number of files on the LUN.
Is your backup up to date?
If not you may wish to contact support. Support does sell data recovery services however do note that the attempt may be completely unsuccessful.
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