ReadyNAS 104 in X-RAID mode: More disks do not increase the capacity

[ernsts]

Hi,

I am using a ReadyNAS 104 with 2x3 TBytes hard disks operated in X-RAID mode (OS Version 6.6.1)

As the used capacity increased over 80% I added two more hard disks of the same type. The are recognized by the NAS (the volume page shows 4 SAT 3 TByte harddisks), but the total capacity is not increased. I expected that the capacity is increased to at least 6 TBytes.

In the manual it is written, that the capacity is increased automatically when new hard disks are added.

Any ideas how to increase the capacity without formatting all hard drives?

Thanks for your answers!

[jak0lantash]

Can you post a screenshot of the status of your volume? Under System / Volumes.

[ernsts]

This is a screen shot of the volume page.

[StephenB]

Sometimes they end up marked as "spare".

Can you download the logs and look in volume.log and mdstat.log?   If you search on "spare" in those files, you should be able to figiure out if that has happened.

Also, when did you add the disks?

[ernsts]

I added the hard disks on 2017-04-24 during power down of the NAS, both at the same time.

In the mdstat.log file of 2017-04-24 the text is as follows (There is no 'spare' in the volumes.log):

Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md127 : active raid1 sdc3[0] sda3[3](S) sdb3[2](S) sdd3[1]
      2925414784 blocks super 1.2 [2/2] [UU]
     
md1 : active raid6 sda2[0] sdd2[3] sdc2[2] sdb2[1]
      1046528 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/4] [UUUU]
     
md0 : active raid1 sdc1[0] sdb1[2] sda1[3] sdd1[1]
      4190208 blocks super 1.2 [4/4] [UUUU]
     
unused devices: <none>
/dev/md/0:
        Version : 1.2
  Creation Time : Mon Apr 27 21:46:04 2015
     Raid Level : raid1
     Array Size : 4190208 (4.00 GiB 4.29 GB)
  Used Dev Size : 4190208 (4.00 GiB 4.29 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Mon Apr 24 18:32:49 2017
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

           Name : 0e36bd68:0  (local to host 0e36bd68)
           UUID : 93dc7bdd:9bc20ecb:ddb5fd1f:3a7cc56f
         Events : 66

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1
       3       8        1        2      active sync   /dev/sda1
       2       8       17        3      active sync   /dev/sdb1

[StephenB]

Something is wrong here:

md127 : active raid1 sdc3[0] sda3[3](S) sdb3[2](S) sdd3[1]

[ernsts]

Do you have any idea how to fix it?

I have the impression that after teh additon of hard disks I got a 3 TByte volume with 3 mirrors and not at least a 6 TByte volume with one mirror.

[mdgm-ntgr]

Well first you'd want to check that all the disks are healthy when it comes to looking at the SMART stats and that the logs don't show issues with the disks in recent days.

You'd also want to verify that the disks are all the same size e.g. by looking in partitions.log (sometimes a disk can be slightly smaller than another)

Then you can force the expansion manually from the backend using a one line command that changes the RAID level to 5 and also specifies the number of disks in the array (in this case 4)

[StephenB]

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@ernsts wrote:

not at least a 6 TByte volume with one mirror.

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You should have a RAID-5 array with 4x3TB.  That is a 9 TB (~8.2 TiB) volume protected with parity blocks distributed across all disks.  That has no "mirror" - a "mirror" by definition has to take half the space.

[ernsts]

Thank you very much for your support.

I check the log files and the health status several times, it is all ok and the hard disk are of the same size.

So, what command should I enter? One additional question: Will the data content on the disks be destroyed?

[Toa84]

I'm having the exact same trouble with my 104. Hope they can sort it out.

[StephenB]

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@Toa84 wrote:
I'm having the exact same trouble with my 104. Hope they can sort it out.

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Please start a new thread, and post the firmware you are running and the details on the added disks.

I'm locking this thread.