Re: how to reconstruct MD RAID device?
Clive Menzies --> debian-user (2005-08-24 15:08:11 +0100):
> On (24/08/05 15:53), Jukka Salmi wrote:
> > Clive Menzies --> debian-user (2005-08-24 14:22:39 +0100):
> > > On (24/08/05 14:45), Jukka Salmi wrote:
> > > > a Debian 3.1 system which uses md devices for all its file systems and
> > > > swap was reset by a power failure. On startup, the root file systems
> > > > md device failed to configure and is in degraded mode now. I think the
> > > > failed device is probably fine, but md configuration failed due to
> > > > parity errors or similar. After skimming through mdadm(8)'s man page
> > > > I still can't figure out what I need to do now, so help is appreciated.
> > >
> > > What is the output of:
> > >
> > > $ cat /proc/mdstat
> >
> > Sorry, I forgot to add that...
> >
> > $ cat /proc/mdstat
> > Personalities : [raid1]
> > md0 : active raid1 hda1[0] hdb1[1]
> > 62400 blocks [2/2] [UU]
> >
> > md2 : active raid1 hda3[0]
> > 39107264 blocks [2/1] [U_]
> >
> > md1 : active raid1 hda2[0] hdb2[1]
> > 976640 blocks [2/2] [UU]
> >
> > unused devices: <none>
>
> Have you tried something like:
>
> $ mdadm /dev/md2 -a /dev/hdb3
No. Unfortunately it's a production system, hence I'm a little bit
cautious with "trying" things... So, considering md2 is used as the
root file system device, is adding hdb3 to it as you describe dangerous?
What exactly does this command do? Does it also start reconstruction
onto hdb3? As you notice, I'm not familiar with Linux software RAID
at all...
Regards, Jukka
--
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$ ((RANDOM%6)) || rm -rf ~
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