[linux-lvm] Software RAID and LVM hangs

[Andreas Dilger]

Jens Bruckmann writes:
> I have problems using software-RAID and LVM. We have connected two HP
> XP256 via two fiber channel controllers and want to mirror from one
> storage-box to the other. So I set up a RAID1-device /dev/md0 which
> mirrors from one LUN of the 1st box to another LUN in the 2nd box. After
> that, I set up a VG on that device with one LV.
> 
> So far, all works fine.
> 
> Then we tested, what happens, if one link to one of the two boxes fails
> and we saw, that the software raid does not continue working if one link
> is down. As I understand, the RAID1 should go on working on the second
> copy and do a resync after the failed connection returns (that's what I
> know from HP-UX with MirrorDisk/UX).
> 
> In /proc/mdstat you cannot see any hint, that one link is broken.
> 
> Do you have any solutions for this behaviour. Otherwise it would not make
> any sense to use the software-raid in a high-availability environment.

This should probably be sent to the RAID list, and not the LVM list.  It
does not really have anything to do with LVM.

Cheers, Andreas
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert