glabel and real disk IDs

[Pawel Jakub Dawidek]

On Fri, Jul 10, 2009 at 09:37:30AM -0700, Marcel Moolenaar wrote:
> 
> On Jul 9, 2009, at 3:24 PM, Pawel Jakub Dawidek wrote:
> >>I see ZFS getting confused when disks are shuffled around.
> >>The confusion is the result of having device paths stored
> >>in the ZFS label match the device name of some other vdev
> >>that part of the same pool.
> >>
> >>Replacing a device with itself doesn't help, because ZFS
> >>complains that the vdev is part of an active pool in that
> >>case. It seems that only labels will work here...
> >
> >Solaris is using device names stored in ZFS label and if this is not  
> >the
> >drive it was looking for, it is doing ID-to-path translation to find  
> >new
> >path name. On FreeBSD on the other hand (after upgrade to v13) I  
> >gave up
> >doing similar thing because disk IDs weren't available from all disk
> >device drivers (I implemented it for ATA and I received no help with
> >other drivers). Currently the idea is to just go through all GEOM
> >providers looking for proper ZFS metadata (think of it as manual
> >tasting), so even if device name changes, ZFS should be able to locate
> >it. If there are still problems locating the disk, there simply  
> >might be
> >a bug in the code of some sort.
> 
> Disks are found correctly, it's just that ZFS' internal
> state is messed up. It uses both the device special file
> name and the stored vdev path and as such can end up with
> multiple VDEVs of the same name. As such, some VDEVs are
> marked as corrupted/faulted.
> 
> I can reproduce it if you're interested.

I am, but I'm leaving tomorrow and I'll be out of e-mail probably for
the next two weeks.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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