Re: Problem Growing Raid 5 Array - Help Needed!

[David Greaves <david@dgreaves.com>]

Jeremy Leigh wrote:
> Hi David,
> Mount works fine for the LVM volume sitting on /dev/md0
> [root@FileServer ~]# mount /dev/LVMRAID/LV0 /home

Ah...

lvm is holding /dev/md0 open.

lvm is layered on top of, and uses, md - just like md uses your hard disks.

Try:
  /etc/init.d/lvm2 stop

That should do it.


> Finally, I can give you output of mdadm --detail, but to be honest, I don't
> know what else I can do... This is really frustrating.
It would be nice if something told you what was holding the lock.
I occasionally forget on the server that uses lvm.

> These commands are being run from root.
>
> [root@FileServer ~]# fsck /dev/md0
Yeah - that's a bad idea!!!
your filesystem lives on /dev/LVMRAID/LV0
  fsck /dev/LVMRAID/LV0

If you had been really unlucky, fsck could have found a superblock and started
scribbling all over your filesystem with potentially devastating results!
Always run filesystem tools on the device holding the filesystem, rather than
some random component ;)

and similartly
> [root@FileServer ~]# resize2fs /dev/md0
resize2fs /dev/LVMRAID/LV0

HTH

David