Re: btrfs listing is wrong

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Root is mounted.   This is the same picture after several reboots.


I've actually did some switching things around, drive swaps and some expansions but it's still oddly displayed.

Label: 'Root'  uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
        Total devices 2 FS bytes used 5.81GiB
        devid    3 size 10.00GiB used 6.78GiB path /dev/sdd6
devid 4 size 10.00GiB used 6.78GiB path /dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa

cartman {~} root# ls -al /dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa lrwxrwxrwx 1 root root 10 Sep 16 16:05 /dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa -> ../../sdd6


cartman {~} root# blkid  /dev/sdd6
/dev/sdd6: LABEL="Root" UUID="d71404d4-468e-47d5-8f06-3b65fa7776aa" UUID_SUB="4ab62e9d-e1dc-4cea-92da-b2640fa841d0" TYPE="btrfs"

cartman {~} root# blkid  /dev/sdi6
/dev/sdi6: LABEL="Root" UUID="d71404d4-468e-47d5-8f06-3b65fa7776aa" UUID_SUB="bf76e31c-a49c-4497-83fb-5cb6567b5ad3" TYPE="btrfs"

(dev 4 is really /dev/sdi6)

This was originally a natively created btrfs via mkfs



On 09/13/2014 02:27 AM, Anand Jain wrote:


Hi Mark,

Label: 'Root'  uuid: d71404d4-468e-47d5-8f06-3b65fa7776aa
         Total devices 2 FS bytes used 7.46GiB
         devid    1 size 9.31GiB used 8.06GiB path /dev/sdh6
         devid    3 size 9.31GiB used 8.06GiB path
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa

 I hope this taken when Root is mounted, (just for confirmation),
 which means those are read from the btrfs kernel. Not by scanning
 the udev.

# ls -al /dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa
lrwxrwxrwx 1 root root 10 Sep 11 10:43
/dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa -> ../../sdh6


 when we read /dev/sdh6 it was devid 1.
When we read /dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa it was devid 3.

 But udev also says
   /dev/disk/by-uuid/d71404d4-468e-47d5-8f06-3b65fa7776aa
 is nothing but a soft link to /dev/sdh6 !!

 Very strange !  Can you run blkid and show its output ?

 Also by any chance did we do a disk to disk copy ?

devid 3 should really  be showing /dev/sde6

 A reboot or btrfs kernel module reload might update the stale
 and tell the facts.


Thanks, Anand

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