James Bensley wrote:
2009/12/31 Luciano Rocha strange@nsk.no-ip.org:
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 can't say this with 100% certainty but I would of thought that it would been fine. I've lost my mdadm.conf (reinstalled OS) with a separate 4 disk RAID 5 array and re-assembled the array and carried on as if nothing had happened.
Yes, I thought mdadm.conf wasn't really necessary these days and if the partitions are type FD (autodetect) the md devices are assembled before you'd be able to read /etc anyway. If your partitions aren't set to autodetect, you might be able to change that, reboot, and come up working.
Use "sudo mdadm -E --scan" do get a list of discovered RAID devices like this example:
ARRAY /dev/md0 level=raid0 num-devices=2 UUID=fde94900:3f3f3bf6
Pop the results in your mdadm.conf and that should sort you out after a reboot (I think). Also try something like "sudo mdadm --assemble /dev/md1 /dev/sdb1 /dev/sdc1" to assemble the RAID manually.
'cat /proc/mdstat' should show the status of the md devices and the partitons that are working so far.