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RN104 data-0 inactive since April, still stuck after PSU fix - need assemble advice
Hi all, I have a ReadyNAS 104 (firmware 6.10.10) with a 4-bay X-RAID2 setup: two Seagate IronWolf 4TB drives and two WD Red 3TB drives. The 3TB baseline across all four disks forms a RAID5 volume...
OK, just to make sure what's going on is understood:
Is data-0 something you actually created, or something that showed up after the failure? It's highly unusual that you would have a volume called data-0 that was ever usable. Normally, data-0 shows up as the name for a part of your data volume when the NAS cannot properly assemble data since two volumes cannot have the same name. When this happens, both data and data-0 are unusable, but both do contain your files -- just not fully assembled in a usable form. Is data showing up in addition to data-0? If not, did you do anything to data, like delete it?
This is not unusual when a power supply fails, though having one dead drive at the time may have made it more likely and/or affect recovery likelihood. Note that by not unusual, I don't mean it happens every time; but it happens enough that it's one of the reasons real backup on a separate device or the web is necessary to fully protect your data.
Letting StephenB analyze your logs is your best next step, but this information may help him.
BTW, SSH may not be working because it's not enabled. But volume recovery is best done from tech support mode anyway, even if SSH works. In tech support mode, the OS has made no attempt to mount the volume.
Thanks for checking, that's a great question. I can answer it directly from the NAS's own logs: "data" carries its own RAID metadata showing a creation date of April 20, 2016, so it's a genuinely separate volume that has existed for about a decade, not something that appeared this month as a fallback naming workaround. Both "data" (931 GB, healthy after a recent resync) and "data-0" (8.17 TB, still inactive) are showing side by side in the interface right now. I haven't deleted anything called "data" or touched it in any way. Getting the full logs ready to send over to StephenB now, thank you both for the help.
Both "data" (931 GB, healthy after a recent resync) and "data-0" (8.17 TB, still inactive) are showing side by side in the interface right now
Both RAID groups are normally concatenated into a single BTRFS filesystem. It sounds like something failed with the 4x3TB group, so it no longer assembles.
If you are lucky, the group is simply out of sync. You will be able to force the re-assembly, as was done in the thread you reference. But the precise commands needed to need to be tailored to your system (particularly here, when you have multiple RAID groups in the volume).
And of course the cause in your particular case might be different.
For a vertically expanded volume, the MDADM RAID groups that make up the data BTRFS volume would normally be data-0 and data-1 if you have expanded once. There would be a data-2 if you had expanded twice. But you are mixing up RAID groups and volumes. The OS tries to separately assemble the part of the BTRFS volume that it could not include in the main one and reports it as data-0 in such a case, but that does not mean it's the data-0 RAID group. Yes, it can be confusing.
From your description, I believe you should have only one volume, data, and the data-0 VOLUME did just show up in the GUI following the failure and is a sign the volume cannot be fully assembled. Furthermore, I don't believe the BTRFS data volume is healthy. Can you actually access anything on it?
That data does still show up and you didn't delete it is good. Had you done so, the volume would be unrecoverable.
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