[CentOS] Lost mdadm.conf

robert mena robert.mena at gmail.com
Thu Dec 31 16:24:23 UTC 2009


Hi,

it worked (kind of). Thanks.

I was able to recreate (the all appear in /proc/mdstat) and in the rescue
I've mounted the /boot which maps to /dev/md0. But I can't mount any other
partition.

they all complain with the same error

mount: Mounting /dev/mdX on /tmp/mountpoint failed: no such file or
directory


Any ideas?


On Thu, Dec 31, 2009 at 11:42 AM, Luciano Rocha <strange at nsk.no-ip.org>wrote:

> On Thu, Dec 31, 2009 at 11:39:25AM -0400, robert mena wrote:
> > Hi,
> >
> > I lost my mdadm.conf (and /proc/mdadm shows nothing useful) and I'd like
> to
> > mount the filesystem again.  So I've booted using rescue but I was
> wondering
> > if I can do a command like this safely (i.e without losing the data
> > previously stored).
> >
> > mdadm -C /dev/md0 --level=raid0 --raid-devices=2 /dev/sda1 /dev/sdb1
> >
> > Where of course the raid devices and the /dev/x are the correct ones
>
> I've collected an howto somewhere from the 'net:
>
> $ cat docs/sysadm/mdadm_recovery.txt
>
> ## define possible devices with arrays
> echo 'DEVICE /dev/hd[a-l]* /dev/sd[a-l]*' > mdadm.conf
>
> ## scan
> mdadm --examine --scan --config=mdadm.conf >> mdadm.conf
>
> ## review configuration, copy to /etc
> cp mdadm.conf /etc/
>
> ## create devices
> MAKEDEV md || { for ((i=0; i <= 31; i++)); do mknod /dev/md$i b 9 $i;
> done; }
>
> ## start arrays
> mdadm --assemble --scan
>
> Best of luck,
>
> --
> lfr
> 0/0
>
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>
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