Rescue md/software RAID array

Christopher Chan christopher.chan at
Tue Jul 6 01:25:49 UTC 2010

On Tuesday, July 06, 2010 09:13 AM, drew einhorn wrote:
> On Mon, Jul 5, 2010 at 6:51 PM, Christopher Chan
> <christopher.chan at
> <mailto:christopher.chan at>> wrote:
>     On Tuesday, July 06, 2010 01:30 AM, Matthias Brennwald wrote:
>      > Dear all
>      >
>      > Last weekend my server "crashed". The machine was running Ubuntu
>     Server 10.04. The file system (except /boot, which is on a different
>     disk) was on a md software RAID (3 disks in RAID 5, plus 1 spare
>     disk). This morning I tried to log in remotely using ssh, but
>     immediately after login the terminal was closed again (so the
>     machine was still running somehow, but it did not want me to be
>     logged in).
>      >
>      > I didn't think much and tried to reboot the machine (I forgot to
>     try logging in directly at the machine). During booting I got a
>     message that the md RAID was degraded, and if I want to continue
>     booting. I answered yes. Immediately after this, I got a message
>     saying that a device/disk UUID could not be found and then got an
>     "(initramfs)" shell.
>      >
>      > I am able to boot using a rescue CD (I used the Ubuntu alternate
>     installer disk, because the Live CD does not have md/softraid
>     support), but I don't really know how to proceed in order to fix
>     things. I would greatly appreciate any hints on how to get the
>     machine up and running again. For instance, which commands should I
>     try after booting into the Ubuntu rescue CD?
>     mdadm --assemble --scan
> I believe that after booting the live cd you can do install any software
> you need to proceed.
> It will disappear when you reboot.  But if you are more comfortable in
> the live cd environment that's an option.  (Actually I'm extrapolating
> from another distribution, but I believe I am correct).

He's trying to fix his raid array. I personally would just use TRK than 
the Ubuntu Live CD for this purpose.

> --
> Drew Einhorn
> "You can see a lot by just looking."
>   --  Yogi Berra

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