can I label a swap partition or find its UUID ?

centguy · 06-17-2009, 10:03 AM

My /dev/sda2 is a swap partition.

Quote:

[root@centos52-64-fuj /]# e2label /dev/sda2
e2label: Bad magic number in super-block while trying to open /dev/sda2
Couldn't find valid filesystem superblock.

and

Quote:

[root@centos52-64-fuj /]# dumpe2fs /dev/sda2
dumpe2fs 1.39 (29-May-2006)
dumpe2fs: Bad magic number in super-block while trying to open /dev/sda2
Couldn't find valid filesystem superblock.

I am trying to label a swap partition or to find out its UUID. Thanks.

Uncle_Theodore · 06-17-2009, 10:12 AM

e2label and dumpe2fs work with the ext2/3 filesystems.
Try the
blkid
command.

farslayer · 06-17-2009, 10:39 AM

man mkswap

mkswap -L label-name /dev/device

ls -al /dev/disk/by-uuid
ls -al /dev/disk/by-id
ls -al /dev/disk/by-path
ls -al /dev/disk/by-label

I don't think you can assign a uuid to a swap partition.. the others should work

nsine · 09-12-2010, 01:37 PM

Sorry for bringing this up but it can be usefull for other people searching this.

I turned off swap (swapoff)
Then made a label for my swap partition because i gave up trying to give it an UUID.
When the label was created, the command returned the label AND an UUID
The UUID of the swap partition is still not printed out when i ls -l by-uuid

And the UUID is valid, I use it in fstab.
(ofcourse i turned swap back on

)

Hope this is helpfull to someone