Re: raid1 issue, somewhat related to recent "debian on big machines"
On Tue, Mar 03, 2009 at 10:59:50PM +0100, Francesco Pietra wrote:
> I understand that the double recommendation is fine. Though, I am
> pressed by answering the referees about a submitted paper as they
> requested additional computation. That was going on until the host
> suspended access to sda. As I find risky to go on with one disk only
> (for a many days computation), could you please explain how to
> reactivate the removed sda, or format it to try if it recovers? I made
> some proposals in previous post. Or indicated that the best is
> replacing the disk with a new one.
You can simply ask mdadm to readd it back and let it rebuild, but likely
the error will happen again and you will need to replace the disk.
If you replace the disk (with a disk at least as big as the old one),
then copy the partition table from the working drive and reread the
partition table (hdparm -z /dev/sda can do that for you) and finally
readd to the various raids again. You do not need to create a filesystem,
since the filesystem runs on the raid, not the individual partitions,
and hence you already have your filesystems made.
--
Len Sorensen
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