Messages in this thread | | | From | Neil Brown <> | Date | Tue, 17 Sep 2002 09:41:10 +1000 | Subject | Re: Raid 1 Issues |
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On Friday September 13, lsawyer@gci.com wrote: > I'm running 2.4.18, and trying to use Raid-1. > > I created /etc/raidtab according to the instructions. > raiddev /dev/md0 > raid-level 1 > nr-raid-disks 2 > nr-spare-disks 0 > device /dev/hdc2 > raid-disk 0 > device /dev/hdb2 > raid-disk 1 > SNIP > "cat /proc/mdstat" shows the the devices connected, but not attached: > > Personalities : [raid1] > read_ahead 1024 sectors > md0 : active raid1 ide/host0/bus0/target1/lun0/part2[1] > ide/host0/bus1/target0/lun0/part2[0] > 77914752 blocks [1/1] [U] > unused devices: <none> >
There is an inconsistancy here. Your raidtab says "nr-raid-disks 2", but mdstat shows there is only 1 raid-disk in the array.
You will need to recreate the array using "mkraid -R /dev/md0" with a raidtab of > raiddev /dev/md0 > raid-level 1 > nr-raid-disks 2 > device /dev/hdc2 > raid-disk 0 > device /dev/hdb2 > failed-disk 1
or with mdadm -C /dev/md0 --level=1 -n 2 /dev/hdc2 missing
Then "raidhotadd /dev/md0 /dev/hdb2" or "mdadm /dev/md0 -a /dev/hdb2" should add the other drive in. Ofcourse you will need to unmount /usr and "raidstop -a" or "mdadm -Ss" first.
mdadm is available at http://www.cse.unsw.edu.au/~neilb/source/mdadm/
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