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Bug#389881: RC-ness of this bug

On Wed, Mar 14, 2007 at 04:57:51PM -0700, Steve Langasek wrote:
> > >, it changes if you change the SCSI/IDE bus address
> > > of the drive
> > the same applied in the old hd? and sd? days, drives names changing when
> > you change thier IDE/SCSI ids is something admins expect and are used to.
> Um.  Have you ever even used SCSI?

Someone which uses scsi-over-fc have much better identification, the wwnn,
which is used in by-id:

| $ ls -al /dev/disk/by-id/scsi-320000020371a*
| lrwxrwxrwx 1 root root  9 Mar  2 23:24 /dev/disk/by-id/scsi-320000020371a2f24 -> ../../sda
| lrwxrwxrwx 1 root root 10 Mar  2 23:24 /dev/disk/by-id/scsi-320000020371a2f24-part1 -> ../../sda1
| lrwxrwxrwx 1 root root 10 Mar  2 23:24 /dev/disk/by-id/scsi-320000020371a2f24-part2 -> ../../sda2

> Well, some of us have, and I don't think any admin of such systems enjoys
> having to fix /etc/fstab by hand.

Also many fc-users wants multipath anyway, which also uses the wwnn for

> Using dd to back up a partition to another isn't a very sensible backup
> schema anyway.  I think more people move PCI devices than back up systems
> this way...

It is widely used in form of snapshots.

> What does the kernel do when it finds two filesystems with colliding uuids?
> Ideally, to avoid any accidents, it should rename them both.  With that fix
> (if indeed it needs fixing), I think all the main problems of by-uuid go
> away.

It does nothing special. This is completely userspace. And current udev just
uses the last seen one, which is usualy the removable device in this case.


Every living thing wants to survive.
		-- Spock, "The Ultimate Computer", stardate 4731.3

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