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Solved
Problem Adding a Drive to ReadyNAS RN628X
I've had a ReadyNAS RN628X for a few years. The first 4 drives were 12 TB and I expanded with 2 16TB drives. The size of the volume expanded as expected each time. It was around 58 TB with 6 drives...
OK, so this is the command you need to issue from SSH to change it to RAID5:
mdadm --grow /dev/md127 --level=5 --raid-devices=7 --force --verbose
That will cause it to re-sync to a RAID5 configuration. For some reason, you may need to issue it again once the sync is complete for it to be properly recognized as RAID5, but it won't have to re-sync again. If you add yet another drive, you'll have to do it again (with --raid-devices=8, obviously) and you'll likely need to do it for md126, too (with 4 devices), as it will convert to RAID6 when the 4th drive is added (at least that's what happens on my 12-bay NAS).
As with any sync, a power cycle can be deadly to your volume and things can always go wrong. So insure your backup is up to date and your NAS is on an UPS before you do this.
If that doesn't work, as it didn't once for me, you will have to convert to FlexRAID and remove one drive (logically, not physically) from the volume and re-install it.
For reference, see here:RAID6-to-RAID5-without-volume-re-creation-is-possible
Some more information. When I added the new drive the messages were different from previous drive adds:
| Nov 07, 2023 11:12:45 AM |
| Volume: Volume data is resynced. |
| Nov 06, 2023 07:20:03 PM |
| Volume: Volume data health changed from Degraded to Redundant. |
| Nov 06, 2023 01:00:35 AM |
| Volume: Volume data is Degraded. |
| Nov 05, 2023 03:50:27 AM |
| Volume: Volume data health changed from Redundant to Degraded. |
| Nov 05, 2023 03:50:27 AM |
Volume: Resyncing started for Volume data.
I understand that a degraded message happens when a drive is failed, but it's reporting all drives are OK and the Degraded message appears to have gone away now that the volume has been rebuilt. It's just much smaller than expected.
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