ReadyNas 6 locked up and now array is inactive

Question

Hello!&nbsp;I have a 6 bay ReadyNas running 6.10.6.System has been expanded from 6x 6TB - &gt; 4x10TB and 2x6TB about a year ago running RAID5 +XRAID.This afternoon the box just locked up, so I rebooted it.When logging into my NAS I saw that all drives were not inactive volumes.&nbsp;First I tried to reboot the device. No change.Powered off and reseated the drives.. No Change.&nbsp;I ssh into the NAS and found /devt/md0, md1, md126 (27TB) and md127 (11TB)&nbsp;md126 contains /dev/sd[abcdef]3md127 contains /dev/sd[abcd]4&nbsp;So that is where I am lost on how to try and resolve this. I only had one DATA volume created in the ReadyNAS gui.How does btrfs play in here with the two volumes? I should have a single DATA volume of nearly 40TB.&nbsp;I am fairly confident in my Linux skills so any help would be awesome. I have googled the heck out of the internet for some information. If I can at least get my array online and move the data off. That would be perfect.&nbsp;&nbsp;

StephenB · Answer

StrawDragon&nbsp;wrote:
&nbsp;
System has been expanded from 6x 6TB - &gt; 4x10TB and 2x6TB about a year ago running RAID5 +XRAID.
&nbsp;
I ssh into the NAS and found /devt/md0, md1, md126 (27TB) and md127 (11TB)
&nbsp;
md126 contains /dev/sd[abcdef]3
md127 contains /dev/sd[abcd]4
&nbsp;
So that is where I am lost on how to try and resolve this. I only had one DATA volume created in the ReadyNAS gui.
How does btrfs play in here with the two volumes? I should have a single DATA volume of nearly 40TB.
&nbsp;

You do have only one volume.&nbsp; But because of the expansion you have two RAID groups - which are concatenated together.
&nbsp;
One is 6x6TB, the other is 4x4TB (filling the remaining space on the four 10 TB drives).&nbsp;
&nbsp;
Raw space on the 6x6 TB group is 36 TB (32.7 TiB).&nbsp;&nbsp;Available storage - subtracting RAID redundancy - is 30 TB ( 27 TiB)
Raw space on the 4x6 TB group is 16 TB (14.5 TiB), and available storage is 12 TB (10.9 TiB).
&nbsp;
So this part looks correct.
&nbsp;
StrawDragon&nbsp;wrote:
&nbsp;
This afternoon the box just locked up, so I rebooted it.
When logging into my NAS I saw that all drives were not inactive volumes.

Do you mean that you have inactive volume (s) on the volume tab???

StrawDragon · Answer

Thank you.&nbsp;The total usable space should be ~38TB (10TB x 4 &amp; 6TB x 2) in RAID 5 with XRAID.&nbsp;Yes it was a single volume.&nbsp;

StephenB · Answer

StrawDragon&nbsp;wrote:
&nbsp;
The total usable space should be ~38TB (10TB x 4 &amp; 6TB x 2) in RAID 5 with XRAID.
&nbsp;

Agreed.&nbsp; Which is the sum of the two RAID groups that comprise the volume - 27 + 10.9 TiB.&nbsp; The NAS reports space in TiB.
&nbsp;
Once again:&nbsp;Do you mean that you have inactive volume (s) on the volume tab???&nbsp; Your original post wasn't clear on that.

StrawDragon · Answer

Yes, they show as red inactive drives and the gui suggests to remove them from the raid.I did include a picture of the volume page in my last post. (see below).&nbsp;How does the system uses the two defined arrays as a single? (md126 and md127) to form a single array of 38.18TB?&nbsp;&nbsp;&nbsp;&nbsp;

StephenB · Answer

StrawDragon&nbsp;wrote:
&nbsp;
How does the system uses the two defined arrays as a single? (md126 and md127) to form a single array of 38.18TB?

Each array creates a virtual disk.&nbsp; And you can create file systems in linux that span multiple disks (concatenating the space).&nbsp; The file system is the volume.
&nbsp;
Thanks for the screenshot, it is helpful.&nbsp; Don't remove those inactive volumes.
&nbsp;
I suggest starting by looking at the smart stats for the disks.&nbsp; smartctl -x /dev/sda will show you stats for the first one, then proceed to sdb, etc.&nbsp; There is a lot of data (much of it extraneous).&nbsp; But -x adds in the error log stored on the drive, so look at that section for any recent errors.&nbsp; Note the time is in power-on hours, so you do need to look at the current power on hours to get some idea of how recent the errors are.&nbsp;
&nbsp;
I also suggest running the smart self test with smartctl for each drive.&nbsp; If you want to take the time, you could also run the full test - though that will take a long time, given the number and size of the disks you have.
&nbsp;
There is a command you could try which (if successful) will allow the volume to be remounted - with perhaps a small amount of data corruption/loss.&nbsp; But let's check the disk health before we move onto that.
&nbsp;
Note there is another avenue - you could get a data recovery contract with Netgear.&nbsp; That is expensive, but it would give you the best odds of data recovery.&nbsp;&nbsp;https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service

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ReadyNas 6 locked up and now array is inactive

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