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ReadyNAS Pro 6 - Disk showing "dead" even though bay is empty
ReadyNAS Pro 6 - Running RAIDiator 4.2.31 - X-RAID2
5 x 3TB - Seagate ST33000650NS - Dual Redundancy
Disks installed in bays 1 thru 5
Whilst running my monthly data scrubbing, disk in Bay 1 di...
Had to covert files to PDF. Looking at this file, it is obvious that the RNP thinks I only have 4 working disks yet Frontview shows different.
You can just copy/paste text snippets from the logs.
mdstat shows the system is somewhat confused.
- md1 and md4 are using all disks (including the missing/dead one)
- md0 and md3 are using the missing/dead disk, but not the new one
- Only md2 is correct.
This could probably fixed with ssh (or by paid support). Another approach is just do a factory reset, and restore the NAS from backup.
Hi Stephen,
I am happy to try fixing with SSH. If that fails I can always do a factory reset but it will take a long time to resore everything due to only having USB2 speeds.
Can you tell me what I should modify?
File "/proc/mdstat" is a zero length file but when I type "cat mdstat" it shows what is in the log file. And if I try "vi mdstat", i get a new file.
Thanks,
Andy.
AndyWheatcroft wrote:
it will take a long time to resore everything due to only having USB2 speeds.
It's quite a bit faster to connect the USB drive to a PC and transfer over the network.
AndyWheatcroft wrote:Can you tell me what I should modify?
You'd need to run mdadm to add drive 5 to the RAID groups that are missing it, and then remove drive 1 one from the RAID groups that still have it.. I'm not certain of exactly what the commands would be. Sandshark probably has a better idea, since he has recently been playing with mdadm on OS-6.
You seem to have too many mdadm arrays, and some have 5 drives and others only 4. But maybe they were created because of incremental upgrades. I don't really know much about how the 4.2.x version of XRAID did its magic, as I knew a lot less Linux when I still had 4.x based systems (I upgraded my Pros to OS6 early on). AFAIK, the EXT file system can't span volumes, so something like LVM (Logical Volume Manager) has to be in the middle. I have no experience with that.
I suspect those arrays with only 4 elements are what's causing it to say you are degraded, and I think you very well may still be. And it may also be that those arrays never having re-sync'ed with the new drive 6 and still showing drive 1 as the "missing" one is what's causing the phantom "dead" drive.
You can gain some additional insight using:
fdisk -l
mdadm --detail /dev/md0
mdadm --detail /dev/md1
mdadm --detail /dev/md2
mdadm --detail /dev/md3
mdadm --detail /dev/md4
But it's good your backup is in order. A factory default may be the only solution. Consider moving to OS6 if you do need to default.
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