Problem with booting newly compiled kernel

[Prasad Joshi]

On Tue, Dec 21, 2010 at 8:43 PM, John Mahoney <jmahoney at waav.com> wrote:
>>> b. Also, who generates these UUID - is it a disk property (like, ROM
>>> signature or stuff?), or this is some udev magic?
>>>
>>
>> IMHO, this is fixed for every device during manufacturing.
>>
>
> I believe the UUID is created per partition/file system and are
> created when creating the file system for a partition.  If anyone even
> had their drive changed from /dev/hda to /dev/sda due to linux
> changing how they labeled ide drives they will know why people use
> UUID instead of the device name .  Also, it is not guaranteed that
> they drives will always come up in the same order between kernel
> releases(This is my personal opinion).
>

I think you are correct, it is assigned when a file system is created.
It is a tunable parameter which can be chnaged using tune2fs -U
command.
A new UUID can be generated using command uuidgen.

> --
> John
>