[Ubuntu] how to find a hard disks UUID

Jayla · 05-11-2008, 12:41 PM

Hi

I've just plugged in two new hard drives, and I need to add entries for them in /etc/fstab

I'd really like to follow suit an use UUIDs in the fstab, but I cant seem to find a command to find their UUID?

I have done it once before, but cannot find a link to where I found that information, can anyone please help?

Regards

druuna · 05-11-2008, 12:47 PM

Hi,

As root: udevinfo -q -n /dev/sdc2

The UUID will be somewhere in the output.
Change sdc2 into an appropriate value for your device.

Hope this helps.

Jayla · 05-11-2008, 12:49 PM

Thanks,

I've just tried that and getting an "unknown command query" back

Regards

druuna · 05-11-2008, 12:55 PM

Hi,

Sorry, my mistake (although you could have found it in the manpage). It should be:

udevinfo -q all -n /dev/sdc2

Jayla · 05-11-2008, 01:03 PM

hmm I can see two types of IDs an not sure which is the correct one

is there a good GUI tool I can use? I have tried gparted but there doesnt seem to be a "mount to" option

druuna · 05-11-2008, 01:15 PM

Hi,

What is the actuall output of the udevinfo command?

Example:

Code:

udevinfo -q all -n /dev/sdc2
P: /block/sdc/sdc2
N: sdc2
S: disk/by-id/ieee1394-00d04b810a08fd05:0:0-part2
S: disk/by-path/pci-0000:10:0b.0-ieee1394-0x00d04b810a08fd05:0:0-part2
S: disk/by-uuid/903f74d8-cc39-42d1-86b9-36c4846288ff
E: ID_SERIAL=00d04b810a08fd05:0:0
E: ID_BUS=ieee1394
E: ID_PATH=pci-0000:10:0b.0-ieee1394-0x00d04b810a08fd05:0:0
E: ID_FS_USAGE=filesystem
E: ID_FS_TYPE=ext3
E: ID_FS_VERSION=1.0
E: ID_FS_UUID=903f74d8-cc39-42d1-86b9-36c4846288ff
E: ID_FS_LABEL=
E: ID_FS_LABEL_SAFE=

The bold parts both show the UUID.

I don't use GUI's for these things, so I cannot point you to one.

druuna · 05-11-2008, 01:21 PM

Hi,

Just remembered:

/lib/udev/vol_id -u /dev/sdc2

sdc2 should reflect your device.

Jayla · 05-11-2008, 01:28 PM

Thanks druuna

Just found an awesome tutorial (doesnt include UUIDs, but I guess I can alter that later)

for future reference..

http://www.psychocats.net/ubuntu/mountlinux

Regards

Jayla · 05-11-2008, 01:29 PM

Quote:

Originally Posted by druuna

Hi,

What is the actuall output of the udevinfo command?

Code:

jimmy@nevada:~$ sudo udevinfo -q all -n /dev/sda
P: /block/sda
N: sda
S: disk/by-id/scsi-1ATA_ST310211A_7DB1D6ZX
S: disk/by-id/ata-ST310211A_7DB1D6ZX
S: disk/by-path/pci-0000:00:0d.0-scsi-0:0:0:0
E: DEVTYPE=disk
E: ID_VENDOR=ATA
E: ID_MODEL=ST310211A
E: ID_REVISION=3.54
E: ID_SERIAL=1ATA_ST310211A_7DB1D6ZX
E: ID_SERIAL_SHORT=ATA_ST310211A_7DB1D6ZX
E: ID_TYPE=disk
E: ID_BUS=scsi
E: ID_ATA_COMPAT=ST310211A_7DB1D6ZX
E: ID_PATH=pci-0000:00:0d.0-scsi-0:0:0:0

druuna · 05-11-2008, 01:54 PM

Hi,

The command you used doesn't give the UUID because your are asking information for the raw disk (/dev/sda)

/dev/sda -> Your HD. The raw container, nothing more.

/dev/sda1 -> A partition with a filesystem on it.
/dev/sda2 -> A partition with a filesystem on it.
.
.
.

You need the /dev/sda[number] part. or parts if you have more partitions on that disk.

After the disk is formatted(!), this should give you the UUID info:

/lib/udev/vol_id -u /dev/sda1

If you have more partitions (or /dev/sda1 is swap space), repeat with 2 3 4 etc.

BTW: Everytime you reformat a partition, the UUID changes. Most people format only once, so it should not be a problem.

Hope this clears things up a bit.

H_TeXMeX_H · 05-12-2008, 09:58 AM

Have you tried:

Code:

bash-3.1$ /sbin/blkid
/dev/hda1: UUID="4ec801af-e521-4ad4-ac24-28e33e084fca" TYPE="jfs" 
/dev/hda2: UUID="1928f341-9591-436d-94de-500df05a291b" TYPE="swap" 
/dev/hdc: LABEL="NOD95" TYPE="iso9660" 
/dev/loop0: LABEL="SIMBRYO" TYPE="iso9660"

You need a GUI for this ... my goodness, I'm speechless. Do you need a GUI for everything. Do you realize how bloated your computer would be if you did ?