Restoring a RAID 10 disk array

Restoring a RAID 10 disk array

[Theodotos Andreou]

Hi to all,

I have a RAID 1 RAID 10 setup that failed. I booted with a recovery usb 
(grml) to try to recover the system. Let me explain the setup to you.

This is my parted listing:

http://pastebin.com/6QdyXRQN

The first partitions (/dev/sd[ad]1) are for EFI. No  RAID here

The second partitions (/dev/sd[ad]2) are the /boot filesystem. This used 
to be /dev/md0 and it is a RAID 1 setup.

The third partitions (/dev/sd[ad]3) is the LVM physical volume which 
hosts all the rest. It used to be /dev/md1 and it is a RAID 10 setup.

For the parted listing it looks like there is some partition table 
corruption on /dev/sdd.

When I try 'mdadm --verbose --assembly --scan' I get:

http://pastebin.com/iqGF9En7

The output of 'mdadm -Evvvvs' is:

http://pastebin.com/kizjT7xE

Assuming I replace the sdd disk and create the appropriate partition 
scheme, what is the correct methodology to restore my md devices? I 
don't care much about /dev/md0 but mostly for the /dev/md1 partition 
where there are all the data.

Regards

Theo

Re: Restoring a RAID 10 disk array

[Theodotos Andreou]

On 23/06/2014 05:04 μμ, Theodotos Andreou wrote:
> Hi to all,
>
> I have a RAID 1 RAID 10 setup that failed. I booted with a recovery 
> usb (grml) to try to recover the system. Let me explain the setup to you.
>
> This is my parted listing:
>
> http://pastebin.com/6QdyXRQN
>
> The first partitions (/dev/sd[ad]1) are for EFI. No RAID here
>
> The second partitions (/dev/sd[ad]2) are the /boot filesystem. This 
> used to be /dev/md0 and it is a RAID 1 setup.
>
> The third partitions (/dev/sd[ad]3) is the LVM physical volume which 
> hosts all the rest. It used to be /dev/md1 and it is a RAID 10 setup.
>
> For the parted listing it looks like there is some partition table 
> corruption on /dev/sdd.
>
> When I try 'mdadm --verbose --assembly --scan' I get:
>
> http://pastebin.com/iqGF9En7
>
> The output of 'mdadm -Evvvvs' is:
>
> http://pastebin.com/kizjT7xE
>
> Assuming I replace the sdd disk and create the appropriate partition 
> scheme, what is the correct methodology to restore my md devices? I 
> don't care much about /dev/md0 but mostly for the /dev/md1 partition 
> where there are all the data.
>
> Regards
>
> Theo
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It turns out the sdd disk was unplugged and I mistakenly took the USB 
drive as the internal disk. This explains why the UUIDs did not match 
the device name.

After I plugged the sdd disk back all went back to normal.

So next time... Don't panic! :)

Sorry for the false alarm guys
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