On Sun Jan 19, 2020 at 11:02:54AM -0600, William Morgan wrote:
> bill@bill-desk:~$ sudo lsblk -f
> NAME FSTYPE LABEL UUID
> FSAVAIL FSUSE% MOUNTPOINT
> .
> .
> .
> sdj
> └─sdj1 linux_raid_member bill-desk:0
> 06ad8de5-3a7a-15ad-8811-6f44fcdee150
> └─md0 ext4
> ceef50e9-afdd-4903-899d-1ad05a0780e0
> sdk
> └─sdk1 linux_raid_member bill-desk:0
> 06ad8de5-3a7a-15ad-8811-6f44fcdee150
> └─md0 ext4
> ceef50e9-afdd-4903-899d-1ad05a0780e0
> sdl
> └─sdl1 linux_raid_member bill-desk:0
> 06ad8de5-3a7a-15ad-8811-6f44fcdee150
> └─md0 ext4
> ceef50e9-afdd-4903-899d-1ad05a0780e0
> sdm
> └─sdm1 linux_raid_member bill-desk:0
> 06ad8de5-3a7a-15ad-8811-6f44fcdee150
> └─md0 ext4 ceef50e9-afdd-4903-899d-1ad05a0780e0
>
> But then I get confused about the UUIDs. I'm trying to automount the
> array using fstab (no unusual settings in there, just defaults), but
> I'm not sure which of the two UUIDs above to use. So I look at mdadm
> for help:
>
> bill@bill-desk:~$ sudo mdadm --examine --scan
> ARRAY /dev/md/0 metadata=1.2 UUID=06ad8de5:3a7a15ad:88116f44:fcdee150
> name=bill-desk:0
>
> However, if I use this UUID starting with "06ad", then I get an error:
>
> bill@bill-desk:~$ sudo mount -all
> mount: /media/bill/STUFF: mount(2) system call failed: Structure needs cleaning.
>
> But I don't know how to clean it if fsck says it's OK.
>
> On the other hand, if I use the UUID above starting with "ceef", then
> it mounts and everything seems OK.
>
> Basically, I don't understand why lsblk lists two UUIDs for the array,
> and why mdadm gives the wrong one in terms of mounting. This is where
> I was confused before about the UUID changing. Any insight here?
>
One is the UUID for the array (starting with "06ad") - this is what you
use in /etc/mdadm.conf. The second is the UUID for the filesystem you
have on the array (starting with "ceef") - that's used in /etc/fstab. If
you recreate the filesystem then you'll get a different filesystem UUID
but keep the same array UUID.
Cheers,
Robin
--
___
( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
/ / ) | Little Jim says .... |
// !! | "He fallen in de water !!" |
