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Forum Discussion
ReadyNAS 626 Status Is "Degraded" After Successful Resync
Just added a new HDD and am seeing this message after the resync: Dec 13, 2022 06:33:28 AM
Volume: The resync operation finished on volume data. However, the volume is still degraded. Any i...
Just an update to all this.
I RMA'd the Seagate EXOS 18TB X18 drive that the 626 had flagged as faulty. (During a pre-return wipe of the data, the HDD failed completely.) The seller sent a replacement HDD and I added that to the unit.
After re-syncing, the 626 is now showing healthy status and data redundancy. So things have stabilized and I have more peace of mind.
HOWEVER...
When I inserted the new HDD, the NAS immediately began re-syncing. I wasn't prompted to format the disk. This immediate re-sync has never happened before.
The NAS re-synced, then hung on apparent completion of that operation. No shares or data were accessible via FTP, GUI or SMB. This error has happened repeatedly with every new HDD I've inserted since 6.10.8. To restore access, the only solution is to power off the NAS physically.
After the NAS rebooted, it was showing a superfluous "data 4" volume. I had to delete that (using the DESTROY command) that to get the NAS to re-sync once again. During this time, the 626 said it was "reshaping" data (as opposed to re-syncing).
After the reshape, the 626 re-synced yet again. It was only after this that the volume showed as "Healthy."
This whole re-sync/reshape/re-sync process took about 4 or 5 days, if I recall.
So even though the volume is now reporting that it's "healthy," I have very little faith in the integrity of my data.
If you insert an unformatted drive that is a replacement for another missing ot dead one, then the NAS will automatically start the re-sync. The bad drive must have caused the NAS to at least start the process of adding the drive, so it considered the replacement drive just that -- a replacement.
I suspect that the "new volume" was data-4, not data 4. That's the name it gives the 4th MDADM RAID in a NAS with multiple groups, like yours. And when BTRFS can't figure out where it belongs, it shows up as a separate volume. But, usually, it is supposed to be part of the main volume and may contain data from it. Destroying it may not have been a good thing, you'll just have to see if any of your data is now corrupt.
If your RAID1 layer is now expanding to RAID5, that's what's reshaping.
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