linux storage – How to View All UUIDs for All Available Disks on Linux

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My /etc/fstab contains this:

# / was on /dev/sda1 during installation
UUID=77d8da74-a690-481a-86d5-9beab5a8e842 /               ext4    errors=remount-ro 0       1

There are several other disks on this system, and not all disks are being mounted to the correct location (For example, /dev/sda1 and /dev/sdb1 are sometimes reversed).

How can I see the UUIDs for all disks on my system? Can I see the UUID for the third disk on this system?

Best Answer

In /dev/disk/by-uuid there are symlinks mapping each drive's UUID to its entry in /dev (e.g. /dev/sda1)

You can view these with the command ls -lha /dev/disk/by-uuid

Assuming ext-family filesystem

# tune2fs -U <output of uuidgen> /dev/sdb1

Or if you're confident uuidgen is going to work:

# tune2fs -U $(uuidgen) /dev/sdb1

Assuming btrfs filesystem

# btrfstune -U $(uuidgen) /dev/sdb1

The UUID is stored in the superblock, so a byte-for-byte copy of the filesystem will have the same UUID.

Best Answer

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Assuming ext-family filesystem

Assuming btrfs filesystem

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