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I've upgraded the original 1TB drives in my 2120 to 3TB drives (one at a time, of course). Seemed to have a glitch with the final drive. Sequence of upgrade was...
1) Remove drive 1 -- system becomes 'degraded'
2) Insert 3TB drive in slot 1 -- resync starts (after deleting volumes on, or reformating the new drive)
3) About 6 hours later the "Volume data is resynced", and Health changes from Degraded to Redundant. There is no appreciable increase in available disk space. (Not a surprise.)
4) Remove drive 2 -- system goes from redundant to degraded
5) Insert 3TB drive in slot 2 -- resync starts (after deleting volumes on, or reformating the new drive)
6) About 6 hours later the "Volume data is resynced", and Health changes from Degraded to Redundant.
7) Immediately thereafter, "Resyncing started for Volume Data". This WAS a surprise -- a second resync cycle?
😎 About 6 hours later, the "Volume data is resynced."
At this point, the total available storage has been increased from 2.63TB to 4.43TB
9) Repeat steps 4-8 on slot 3 (second resync takes about 18 hours!)
At this point, the total available storage has been increased from 4.43TB to 6.25TB
10 Repeat steps 4-6 above on slot 4
The second resync does not start, Total available space still at 6.25TB. Status on the overview page shows "Healthy", not "Redundant". HTTP response seems sluggish. I SSH in, 'top' shows not much happening, all disks status leds are quiet, activity leds quiet. Eventually SSH stops logging in (get banner but no prompt) and Admin page won't progress beyond it's first screen (Banner/Version page). Power button on front has no effect. Reset button on front has no effect.
Eventually I performed a Power Reset. System comes back up and seems intact. It now starts the "2nd" resync. About 8 hours later it says the "Volume data is resynced", and "Disk in channel 4 (Internal) changed from RESYNC to ONLINE. This is a new log message not seen in the previous cycles. There has still been no increase in Total Space for the upgrade of the 4th drive.
Current status on the System Overview screen shows "Healthy", not "Redundant"
Volumes page shows all 4 3TB drives as green, and online, Performance page shows all green.
There was no increase in space for the 4th drive, still at 6.25TB.
Not sure where to go from here. Any help would be appreciated.
Your root volume was oddly marked as having 5 disks with one missing. I fixed that.
As for your data volume one of the 3TB disks was marked as spare in the new layer. I just fixed that. The volume is currently reshaping. Once that is complete the volume should then expand.
7) Immediately thereafter, "Resyncing started for Volume Data". This WAS a surprise -- a second resync cycle?
XRAID creates RAID layers. The first resync was to restore the 1 TB layer you already had. The vertical expansion creates a second 2 TB layer, which is merged into the virtual disk. That needs its own sync/creation, and I think that is what you are seing here.
9) Repeat steps 4-8 on slot 3 (second resync takes about 18 hours!)
Resync requires either reading from or writing to every disk sector in the volume. So the larger the volume is, the longer it takes. And of course the upper 2 TB layer will take longer than the base 1 TB layer. Another factor is that disk reads/writes are faster at the beginning of the disk, and slows as you move towards the end.
Current status on the System Overview screen shows "Healthy", not "Redundant"
Volumes page shows all 4 3TB drives as green, and online, Performance page shows all green.
There was no increase in space for the 4th drive, still at 6.25TB.
Not sure where to go from here. Any help would be appreciated.
Probably best to contact support - perhaps wait a little bit, and see if someone from Netgear offers to look at the logs.
You could also try rebooting the NAS, and/or look in rn_expand.log, mdstat.log and smart_history.log yourself.
There are some issues with ARM platforms that are fixed in 6.4.2-RC1, so trying that might help. I'd wait for log analysis/support help before trying that step though.
Your root volume was oddly marked as having 5 disks with one missing. I fixed that.
As for your data volume one of the 3TB disks was marked as spare in the new layer. I just fixed that. The volume is currently reshaping. Once that is complete the volume should then expand.
