Re: using UUID's for a raid1 in /etc/fstab instead of /dev/md0
Alex Samad wrote:
On Tue, Apr 08, 2008 at 11:08:11PM -0400, Mitchell Laks wrote:
Someone recently talked about using
ls -l /dev/disk/by-uuid
to figure out the correct UUID to put into /etc/fstab
for hard drives.
I have /home on a raid1 /dev/md0 which is composed of two drive partitions
Now in /etc/mdadm/mdadm.conf
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=3cfd16a0:6eaa64dd:0dfcf1b5:2690c9eb
Now, I thought to try that UUID, but when I tried that
and put the line
UUID=3cfd16a0:6eaa64dd:0dfcf1b5:2690c9eb /home ext3 defaults,errors=remount-ro 0 1
It was a real bust and dropped me into control d boot land. I then fixed it
/etc/fstab back to /dev/md0 and all was ok.
thats because you have placed the UUID of the parts not the fs system
that exists on the raid
try tune2fs -l /dev/md0 and use the UUID from there
So that must be the UUID for the individual /dev/sda1 and /dev/sdb1.
What is the UUID for the raid1 itself?
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I looked at tune2fs -l /dev/md0:
Filesystem UUID: d3bb5b79-2d5f-438d-a60e-5437e80e2edf
from ls -l /dev/disk/by-uuid
root root 9 2008-04-07 12:51 d3bb5b79-2d5f-438d-a60e-5437e80e2edf ->
As you can see, same UUID. So then I went to look at /etc/fstab:
UUID=d3bb5b79-2d5f-438d-a60e-5437e80e2edf /home ext3
defaults 0 2
As you can see, same uuid and md0 is mounted by uuid.
from my menu.lst
title Ubuntu 7.10, kernel 2.6.22-14-generic
kernel /boot/vmlinuz-2.6.22-14-generic root=UUID=cbec0e90-a36f-4850-8da0-8c4ab3d94247 ro quiet splash
different uuid becuse / is not on a raid, only /home is. From fstab for /:
UUID=cbec0e90-a36f-4850-8da0-8c4ab3d94247 / ext3
defaults,errors=remount-ro 0 1
Disclaimer, this is NOT debian, but ubuntu 7.10. Due to not being able
to print in debian, I am currently forced to run ubuntu. Very close to
What you did not say was what version of Debian are you running? It all
works here. There is the bug listed above but the dev says that sid does
not fix the issue. If you are running ubuntu, it should work. (it does
here, YMMV.). But then again, it always worked for me in Debian also.
Damon L. Chesser