Re: Confused about UUID mounting and mirrors

["michael@kmaclub.com" <michael@kmaclub.com>]

Michael Tokarev wrote:
> michael@kmaclub.com wrote:
> []
>> mdadm --detail /dev/md0 | grep UUID
>>            UUID : 3531a48d:1180bdf3:bfcd9e76:5b7e5957
> 
> This is a RAID (md) -- i.e., device, UUID.  Think of it
> as of disk drive serial number for example -- look at
> /dev/disk/by-id/.
> 
>> mount -U 3531a48d:1180bdf3:bfcd9e76:5b7e5957 /mnt
>> mount: no such partition found
> 
> And mount expects *filesystem* UUID, not a device UUID.
> I.e., the UUID which was written by mkfs.  For a ext[234]fs,
> tune2fs -l /dev/md0 will show it; for other filesystems
> use appropriate tools.


I understand.  I was trying this based on a suggestion further back in 
this thread.

Using the filesystem ID doesn't work either because /dev/sda, /dev/sdb, 
and /dev/md0 all have the same UUID since it is a mirror.  How do you 
tell the system to mount /dev/md0 and not the individual drives which is 
what it is trying to do now.

Michael