On 14/05/14 08:31, Wang Shilong wrote:
On 05/14/2014 09:18 AM, Eric Sandeen wrote:
Allow the specification of the filesystem UUID at mkfs time.
(Implemented only for mkfs.btrfs, not btrfs-convert).
Just out of curiosity, this option is used for what kind of use case?
I notice Ext4 also has this option.:-)
I have used it a few times when replacing the hard disc of a Linux
system, while trying to leave everything else untouched.
Many distros, including Debian and Ubuntu write the /etc/fstab to
specify volumes by UUID instead of by label or device path.
I have also had the misfortune to use an embedded system where the boot
volume UUID was configured into the flash in a non obvious way, so the
easiest fix was to set-up the boot and root volumes on the replacement
hard disc to have the same UUID.
Of course in either case I could have just taken a bit for bit copy of
the source volume using dd, but that had it'd own problems because the
destination was smaller. I also wanted to defrag the fs while copying it.
--
David Pottage
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