Thanks for all the help. I decided to use the WWID of the drives, as it
was about the only clearly unique thing that I could find. It also is
robust to changes in the FC fabric. I've created a file in
/etc/udev/rules.d/local.rules with the following:

# tape changer
KERNEL=="sg*[0-9]", ENV{ID_SERIAL}=="200900d0715a2007a",
SYMLINK+="tape/neo8000"
# first tape drive by WWID
KERNEL=="st*[0-9]", ENV{ID_PATH}=="*500110a00058bd40*",
SYMLINK+="tape/drive0"
# second tape drive by WWID
KERNEL=="st*[0-9]", ENV{ID_PATH}=="*500110a00058c2f0*",
SYMLINK+="tape/drive1"

Hope that can be of help to anyone else. I spent most of the day chasing
this tail.

Robert LeBlanc
College of Life Sciences Computer Support
Brigham Young University
(801) 422-1882
leblanc AT byu DOT edu


> -----Original Message-----
> From: Alan Brown [mailto:ajb2 AT mssl.ucl.ac DOT uk]
> Sent: Wednesday, November 19, 2008 10:37 AM
> To: Robert LeBlanc
> Cc: John Drescher; bacula-users AT lists.sourceforge DOT net
> Subject: Re: [Bacula-users] Fibre Channel drives keep switching
> 
> On Wed, 19 Nov 2008, Robert LeBlanc wrote:
> 
> > > You can write a udev rule to lock the drives down. I wrote one
> awhile
> > > back to keep the changer device the same.
> > >
> > > dev6 ~ # cat /etc/udev/rules.d/55-bacula.rules
> > > SUBSYSTEM=="scsi",ATTRS{vendor}=="EXABYTE*",ATTRS{type}=="8",
> > > SYMLINK+="autochanger1 changer"
> 
> For the drives you're better off creating udev rules to create
> something
> like /dev/scsi/ntape/{drive-WWID} and /dev/scsi/generics/{WWID}
> 
> These won't change no matter where on the scsi/fabric the drive is.
> 
> I've had a request ticket in with Redhat to implement this on RHEL4/5
> for
> a long time, ditto with the /dev/sg/ devices for the same reason.
> 
> (Not to mention a strong wish for multipath support for tapes and
> generics...)
> 



-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users