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Forum Discussion
ReadyNas 6 locked up and now array is inactive
Hello! I have a 6 bay ReadyNas running 6.10.6. System has been expanded from 6x 6TB - > 4x10TB and 2x6TB about a year ago running RAID5 +XRAID. This afternoon the box just locked up, so I reboo...
StrawDragon wrote:
The total usable space should be ~38TB (10TB x 4 & 6TB x 2) in RAID 5 with XRAID.
Agreed. Which is the sum of the two RAID groups that comprise the volume - 27 + 10.9 TiB. The NAS reports space in TiB.
Once again: Do you mean that you have inactive volume (s) on the volume tab??? Your original post wasn't clear on that.
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).
How does the system uses the two defined arrays as a single? (md126 and md127) to form a single array of 38.18TB?
StrawDragon wrote:
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. And you can create file systems in linux that span multiple disks (concatenating the space). The file system is the volume.
Thanks for the screenshot, it is helpful. Don't remove those inactive volumes.
I suggest starting by looking at the smart stats for the disks. smartctl -x /dev/sda will show you stats for the first one, then proceed to sdb, etc. There is a lot of data (much of it extraneous). But -x adds in the error log stored on the drive, so look at that section for any recent errors. 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.
I also suggest running the smart self test with smartctl for each drive. 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.
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. But let's check the disk health before we move onto that.
Note there is another avenue - you could get a data recovery contract with Netgear. That is expensive, but it would give you the best odds of data recovery. https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service
I am not asking for a data recovery, I should be able to pay per incident for them to bring the array online if I cannot do so. There was no drive failure and smart shows 0 errors on the 6 drives.
One drive has a couple of errors but most recently was over ~1680 days ago on one of the two 6TB drives.
So I have two logical volume md126 and md127, how does it combine two virtual volumes? Does it use raid0? as parity is across each drive?
Concatenating the RAID groups is done by BTRFS, it's not RAID. It's nothing unique to ReadyNAS. XRAID is "just" some logic that makes doing that easier for those that don't care to go "under the hood" with generic Linux. The RAID groups (and their parity) are entirely independent of BTRFS, being created and maintained by mdadm.
But if BTRFS wasn't aware that the RAID groups belonged together, you'd be usually seeing multiple (inaccessible) volumes in the GUI, usually data and data-0 and/or data-1. Your display is what usually is shown when a volume has gone read-only due to an error, not one where the volume is inaccessible.
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