[CentOS] Lost mdadm.conf

Luciano Rocha strange at nsk.no-ip.org
Thu Dec 31 15:42:14 UTC 2009

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,

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