Upgrading Netgear ReadyNAS Disks

[Graham-]

I have tried to increase capacity in my RN214 (firmware 6.9.3) from 4 x 3TB to 4 x 10TB. 

I replace the drive one at a time and let them sync before changing the next. All went well until I replaced the 4th disk when the NAS created 2 RAID groups. 

RAID group #1 seems to be using all 4 disks but RAID group #2 only shows the first 3.

Total capacity of the NAS is 20TB not the 30TB as expected.

I can still access all my data but how can I get back to a single RAID with 30TB?

[StephenB]

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@Graham- wrote:

All went well until I replaced the 4th disk when the NAS created 2 RAID groups. 

With vertical expansion, the NAS would always create a second RAID group.  However, with XRAID it wouldn't be shown on the volume page.

Are you currently in XRAID or FlexRAID?  If you are in XRAID you will see a green stripe on the XRAID control on the volume page.

[mdgm-ntgr]

What does your mdstat.log look like?

[Graham-]

I'm sure it was on X RAID but it's now showing as RAID 5

[Graham-]

Logs have been emailed

[mdgm-ntgr]

X-RAID uses RAID-5 for 3 or more disks in the RN214 by default. As StephenB mentioned Its whether you see the green stripe or not that tells you whether you're using X-RAID.

Look in mdstat.log and you'll see

md126 : active raid5 sdb4[2] sda4[1] sde4[0]
      13672082432 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU]

So there's no sdd4 in md126

Look in partitions.log and we see that sdd4 doesn't exist

   8       64 9766436864 sde
   8       65    4194304 sde1
   8       66     524288 sde2
   8       67 2925545912 sde3
   8       68 6836172304 sde4
   8        0 9766436864 sda
   8        1    4194304 sda1
   8        2     524288 sda2
   8        3 2925545912 sda3
   8        4 6836172304 sda4
   9      126 13672082432 md126
   8       16 9766436864 sdb
   8       17    4194304 sdb1
   8       18     524288 sdb2
   8       19 2925545912 sdb3
   8       20 6836172304 sdb4
   9        1     523712 md1
   8       48 9766436864 sdd
   8       49    4194304 sdd1
   8       50     524288 sdd2
   8       51 2925545912 sdd3

If you look in disk_info.log you'll see that disk sdd is in channel 3 (if counting 0 to 3, it would be in drive bay 4 if counting from 1-4).

You should try a reboot and see if a resync starts.

Failing that there's a few options:

1. Remove disk 4 and reinsert it to trigger a resync and hopefully the addition of partition 4, adding it to md126.

Or 2. I could add partition 4 to that new disk and manually add it to md126. Once the sync completes (this will take a while) the volume should then expand.

[mdgm-ntgr]

The sync has started. This will take several hours, perhaps a few days or so. After the sync completes the volume will then expand.

[Graham-]

Thanks for you help mdgm.