RE: mount-by-label finds drive not array ????

-----Original Message-----
From: linux-raid-owner@vger.kernel.org 
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Luca Berra
Sent: 22 July 2004 17:54
To: linux-raid@vger.kernel.org
Subject: Re: mount-by-label finds drive not array ????

On Thu, Jul 22, 2004 at 05:33:13PM +0100, 
robin-lists@robinbowes.com wrote:

quoted

quoted

/dev/md0        /mnt/bar      ext3      defaults        0 4

Since if I do it by "LABEL=", it tries to mount hda1, not md0!

Is this just a known/accepted brain-deadness of the mount code?

Tom,

I'm just considering doing something like this.

Did you ever get any resolution to this issue?

is there any need to mount a md device by label, since you 
can already identify the md components by uuid when you 
assemble the raid.

Probably not. It's just something I'm trying.

Incidentally, it seems to work OK for me.

I'm using Fedora Core 2. Here's my /etc/fstab (only labelled partitions
listed):

LABEL=dude_root         /                       ext3    defaults        1 1
LABEL=hda_music         /home/slimserver/music  ext3    defaults        0 0
LABEL=/                 /mnt/hda                ext3    defaults        1 1
LABEL=/boot             /mnt/hda/boot           ext3    defaults        1 2
LABEL=/home             /mnt/hda/home           ext3    defaults        1 2
LABEL=/opt              /mnt/hda/opt            ext3    defaults        1 2
LABEL=/tmp              /mnt/hda/tmp            ext3    defaults        1 2
LABEL=/usr              /mnt/hda/usr            ext3    defaults        1 2
LABEL=/usr/local        /mnt/hda/usr/local      ext3    defaults        1 2
LABEL=/var              /mnt/hda/var            ext3    defaults        1 2

And here's what get's mounted:

/dev/md0 on / type ext3 (rw)
/dev/hda11 on /home/slimserver/music type ext3 (rw)
/dev/hda7 on /mnt/hda type ext3 (rw)
/dev/hda1 on /mnt/hda/boot type ext3 (rw)
/dev/hda3 on /mnt/hda/home type ext3 (rw)
/dev/hda5 on /mnt/hda/opt type ext3 (rw)
/dev/hda10 on /mnt/hda/tmp type ext3 (rw)
/dev/hda2 on /mnt/hda/usr type ext3 (rw)
/dev/hda6 on /mnt/hda/usr/local type ext3 (rw)
/dev/hda9 on /mnt/hda/var type ext3 (rw)

The reason I decided I'd like to use labels is because I found I was
spending far too much time trying to find file systems on old disks to copy
data across in a new system.

Take the example above: /dev/hda is from another system and I wanted to
mount all partitions to check some config settings. I found I was doing
stuff like:

# cat /proc/partitions
major minor  #blocks  name

   3     0  120060864 hda
   3     1     104391 hda1
   3     2    3068415 hda2
   3     3    2048287 hda3
   3     4          1 hda4
etc.

# mkdir /mnt/hda1 ; mount /dev/hda1 /mnt/hda1
# ls /mnt/hda1
(ah, /dev/hda1 must me the old /boot partition)
# umount /dev/hda1
etc.

Eventually I'd find the root filesystem, mount it, then mount all the other
filesystems on the old root fs.

With labels I can just do this:

# findfs LABEL=hostname_root
/dev/hda7

# mount /dev/hda7 /mnt/hda

Or even:

# mount `findfs LABEL=hostname_root` /mnt/hda

Or even;

# for d in usr usr/local tmp home var ; do mount `findfs LABEL=hostname_$d`
/dev/hda/$d ; done

R.