> You will install a single library with a command similar to this:
>
> define library 3575 device=/dev/lb0 (lb0.0.0.1 for NT) libtype=scsi
>
> Then define the drives:
>
> define drive 3575 drive1 device=/dev/mt1 (mt1.0.0.0 for NT) element=elem# (as 
> provided by lbtest or the manufacturer)
>
> repeat for all four drives.
>
> Then you will want to define a device class that uses this library.

Actually, I cannot speak for NT, but on Solaris, the lb/mt drivers are
only used for non-IBM libraries.  The 3575, being an IBM library, using
the IBMtape drivers (st for drives, smc for library).

Here is my L12, which is 1/2 of a L24:

dsm> q library 3575 f=d

                  Library Name: 3575
                  Library Type: SCSI
                        Device: /dev/rmt/1smc
              Private Category:
              Scratch Category:
              External Manager:
Last Update by (administrator): RODER
         Last Update Date/Time: 12/28/98   17:06:42

adsm> q drive

Library Name     Drive Name       Device Type     Device              ONLINE
------------     ------------     -----------     ----------------    ----
3575             D1               3570            /dev/rmt/0st         Yes
3575             D1               3570            /dev/rmt/0st         Yes
3575             D2               3570            /dev/rmt/2st         Yes
3575             D3               3570            /dev/rmt/4st         Yes
3575             D4               3570            /dev/rmt/6st         Yes
3575-2           D1-2             3570            /dev/rmt/12st        Yes
3575-2           D2-2             3570            /dev/rmt/14st        Yes
3575-2           D3-2             3570            /dev/rmt/8st         Yes
3575-2           D4-2             3570            /dev/rmt/10st        Yes
DLT4700          DLT4000          DLT             /dev/rmt/17mt        Yes
MANUAL_DLT       DLT7000          DLT             /dev/rmt/16mt        Yes

Notice that the DLT's use lb/mt.  The IBMtape equiv. of lbtest is tapeutil
in /opt/IBMtape.

Depending on how your 3575 is configured, it may have a changer accessible
as lun1 on all four drives.  This allows you to still communicate with the
library if the drive you are using fails...just update your library to use
one of the other device files in /dev/rmt.  This was also necessary for
IBM to allow the library to be partitioned into multiple logical
libraries.

Hope this helps.

Steve (unVMix Systems Programmer/Dude) Roder
(tkssteve AT ubvm.cc.buffalo DOT edu | tkssteve AT acsu.buffalo DOT edu | 
(716)645-3564 ,
   | http://ubvm.cc.buffalo.edu/~tkssteve)