On Fri, Aug 08, 2003 at 10:45:00AM -0500, Bruntel, Mitchell L wrote:
>    mtx -F <changerdev> load tape 44 into drive 2
> Very Close Jon:
> 
>  mtx [ -f <loader-dev> ] [invert] load <storage-element-number> [<drive#>]
> (so for me:  mtx -f  /dev/changer load 44 2)
> (and yes, after finally getting all that SCSI junk done, it's /dev/changer 
> which points to
>  /dev/scsi/changer/c1t0d0
> 
> So you (too) think that driveslot IS required to point to correct drive.
> 
> Now, which tapedev do I point to in amanda.conf... This gets more confusing...
> 
> 
> 
> -----Original Message-----
> From: Jon LaBadie [mailto:jon AT jgcomp DOT com]
> Sent: Friday, August 08, 2003 11:28 AM
> To: amanda-users AT amanda DOT org
> Subject: Re: A last question (here) on chg-MTX-ZD
> 
> 
> On Fri, Aug 08, 2003 at 10:00:41AM -0500, Bruntel, Mitchell L wrote:
> > Hopefully this is it.  sorry it's so lengthy.  
> > 
> > Question is kind of short.
> > 
> > In the changer script chg-zd-mtx script Variable :DriveSlot  
> > is defined as 
> >             Figure out the drive slot number.  By default, it is set to 0. 
> > In the example above, 
> >             the tape drive ("Data Transfer Element") is in slot 0. If your 
> > drive slot is not 0, you
> >             need to set the drive slot number with the "driveslot" variable.
> > 
> > ====================
> > Here's the question.
> > ====================
> > I'm lucky(?) enough to have a three drive robot.
> 
> Here is my question, forgetting amanda, how would you load a tape, say
> tape 44 into the third tape drive using the mtx command from the shell
> prompt?  Never having had the 'luxury' of a multiple drive library,
> I don't know if or how you can say something like:
> 
>    mtx -F <changerdev> load tape 44 into drive 2
> But if you have to specify a number for the drive, I'd suspect that
> is the number to use for the "driveslot".
> 
> BTW, you are using names like /dev/rmt/0 ...  I assume it is Solaris.
> Those names are for the drives when reading and writing tapes.  I'd
> expect that when your library is installed (or installed correctly :)
> there would be a separate device created just for the changer mechanism.
> 
> The change device would be the device to use with mtx, not the read/write
> devices.  Often the changer device gets created under /dev/scsi/... or
> /dev/changer.  It may require editing of the /kernel/drv/sgen.conf file
> before it can be created.
> 
> -- 
> Jon H. LaBadie                  jon AT jgcomp DOT com
>  JG Computing
>  4455 Province Line Road        (609) 252-0159
>  Princeton, NJ  08540-4322      (609) 683-7220 (fax)
> 
> 
>>> End of included message <<<

What is so confusing.  You have 4 devices, 3 tape drives /dev/rmt/{0,1,2}
and one changer /dev/changer.

changerdev is ... duh ... /dev/changer

tapedev is one of the others, whichever of the 3 drives you want to use
for this amanda configuration.  One amanda config can only use one one
tape drive.  And set driveslot to the same number, 0,1,2 as your tape device.

BTW the driveslot and the tapedevice number don't have to match, they just
happen to nicely match in your installation.  If for example you had two
other tape drives installed, say a DAT tape and a reel to reel, they "might"
be installed as /dev/rmt/0 and 1.  Then your library drives would be 2,3,4
but their driveslots would still be 0,1,2 (i.e. within that library).

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
 4455 Province Line Road        (609) 252-0159
 Princeton, NJ  08540-4322      (609) 683-7220 (fax)