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Re: using UUID's for a raid1 in /etc/fstab instead of /dev/md0

On Tue, Apr 08, 2008 at 11:08:11PM -0400, Mitchell Laks wrote:
> Hi,
> 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
> /dev/sda1
> /dev/sdb1
> Now in /etc/mdadm/mdadm.conf
> I have:
> 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  
> /etc/fstab
> using
> http://linuxbasics.org/tutorials/during/uuid_naming?rev=1207514451
> thus
> 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?
> Thanks.
> Mitchell
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