Updated to 6.7.5 on Ultra 6 plus and now I have 2 Raid groups

[jamestx10]

On 6.7.4 I had one RAID volume using all six disks in X-Raid. Updated to 6.7.5, system rebooted got a degraded alert and now I have Raid Group 1 using disk 1, 2, 3, 5 & 6 in raid 5 and Raid Group 2 using disk 4, 5 & 6 in raid 5. From a simple first check data seems to be fine and I can access shares.

Any ideas on what to try?

[StephenB · Accepted solution]

Interesting - I'm not seeing that.  Not sure if it's because your volume is degraded, or if it's because all my disks are the same size.

I'd make a backup first.

You could try removing disk 4, unformatting it, and then reinserting it.

[StephenB]

Are your disks of unequal size?  That would explain multiple RAID groups.  If so, can you let us know that the disk size in each slot?

[jamestx10]

They are different sizes:

Disk 1, 2 & 3 are all 2 TB

Disk 4, 5 & 6 are all 3 TB

I did not see anything in the release notes about that feature changing.

[StephenB]

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@jamestx10 wrote:

I did not see anything in the release notes about that feature changing.

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Perhaps I am not understanding what you mean by RAID group.  I was assuming that you were looking at mdstat.log.

Mixed disk sizes with XRAID require multiple groups as outlined here: https://community.netgear.com/t5/ReadyNAS-in-Business/Mixing-drive-makes-models-within-a-NAS/m-p/131...  This has always been the case, it is not something new for 6.7.5.

So you should have two RAID-5 groups for the data volume - one that uses 2 TB per disk and spans disks 1-6, and a second that uses 1 TB per disk and spans disks 4-6.  These should be labled md1xx in mdstat.log.

mdstat.log will show two more groups for OS use - md0 and md1.

The data volume RAID groups are assembled into one volume.

Anyway, if you are looking somewhere other than mdstat.log, please let us know where.

[jamestx10]

This is in the GUI and was not reported like that before this OS update.

Raid1

Raid2

Raid 1 is also missing disk 4 and I would guess that is why it says that "Volume data is Degraded". I am fine with it displaying the 2 raid groups but I would like to get the volume healthy again.

[StephenB · Accepted solution]

Interesting - I'm not seeing that.  Not sure if it's because your volume is degraded, or if it's because all my disks are the same size.

I'd make a backup first.

You could try removing disk 4, unformatting it, and then reinserting it.

[jamestx10]

I will have to try that when I am back at that location. Thankfully this IS my backup device so worse case I could repopulate it over the LAN if it all goes south. Thanks for your quick input and I will update after I have tried that.

[jamestx10]

That worked. I still have two raid groups showing in the GUI and it does not say that it is X-Raid so that is a little concerning down the road if I would replace some of the 2 TB drives with larger ones but for now the volume is online and happy. THANKS

[StephenB]

Glad that it is redundant again.

Is the green stripe present on the XRAID control?  If not, you might turning XRAID back on - that is non-destructive.

[jamestx10]

No green strip so I clicked it, switched to X-Raid and now the GUI no longer shows two raid groups.