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Old 07-02-2008, 06:20 PM   #1
sandaili
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Can I assign a UUID to a disk added without deleting data? How?


I have a disk that is not automounted by Fedora 9. I would like it to be, and I'd like preferably for it to have it's own UUID. But, just by adding a unique UUID to the fstab, obviously won't work.

But I am afraid I can't find any information about how to add a UUID to an existing disk that is full of data. Anywhere. I've searched and searched....

L

Nevermind, I'm a moron. I assumed there wasn't a UUID because I was getting an error. However, I needed the right command, and I was using the wrong one. This is the command to find a UUID for a device in Fedora: udevinfo -q env -n /dev/sdb1

Hope that helps someone.

Last edited by sandaili; 07-02-2008 at 06:27 PM. Reason: found solution
 
Old 07-02-2008, 09:00 PM   #2
GlennsPref
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Thank you.
I had a bit of trouble with 2 of my fat32 partitions having the same uuid number,

This might help me sort it out.

Regards, Glenn
 
Old 07-02-2008, 09:33 PM   #3
Mr. C.
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# uuidgen
# tune2fs /dev/hdaX -U numbergeneratedbyuuidgen
# vol_id /dev/hdaX
 
Old 07-02-2008, 09:57 PM   #4
syg00
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Not all filesystems support UUID - notably VFAT (and NTFS) last I looked. UUIDs can be generated for them, but labels are probably a better option for them.
 
Old 07-02-2008, 10:22 PM   #5
GlennsPref
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Hey, Thanks for the info,

Mr.C., Can you give me a short description of what you posted, please?


syg00, fstab has these entries for...sdb8 and sdb9 both had UUID=4807-901A and while it was only one partition would show up, and it was difficult to navigate, let alone read and write files. So I edited it back to the old way... Possibly not supported as you mention.

excerpt from fstab,

# Entry for /dev/sda1 :
UUID=4C54BBD554BBBFCE /mnt/win_c ntfs-3g defaults 0 0
# Entry for /dev/sdb8 :UUID=4807-901A
/dev/sdb8 /mnt/win_c2 vfat defaults,umask=0,quiet 0 0
# Entry for /dev/sda10 :UUID=4807-8FD4
/dev/sda10 /mnt/win_d vfat defaults,umask=0,quiet 0 0
# Entry for /dev/sdb9 /mnt/win_d2:
/dev/sdb9 /mnt/win_d2 vfat defaults,umask=0,quiet 0 0

(wip)
cheers,
Regards, Glenn
 
Old 07-02-2008, 10:39 PM   #6
Mr. C.
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Quote:
Originally Posted by syg00 View Post
Not all filesystems support UUID - notably VFAT (and NTFS) last I looked. UUIDs can be generated for them, but labels are probably a better option for them.
Yes, you are correct.

Quote:
Originally Posted by GlennsPref View Post
Mr.C., Can you give me a short description of what you posted, please?
[/QUOTE]


1) generate a UUID for the device
2) push that UUID onto the meta-data for the ext[23] file system
3) verify the value placed there

$ man uuidgen tune2fs vol_id

for the complete details.
 
  


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