Hello All,

I have seen many answers to this question posted.... all of which are
"technically" accurate. However, the only ADSM "supported" configuration to
date is as so........

Regardless of the interal cabling / number of control paths (for example: 2
drives per scsi initiator) you should only have one /dev/smc0 device listed
for this unit when issueing 'lsdev -C tape'.

This is the library device that should used when defining the library to
ADSM with the DEFINE LIIBRARY command.

NOTE:
There is an error in the ADSM Admin Guide and Admin Reference indicating
that the /dev/rmtX.smc special file should be used as the library device.
Although this will work in most circumstances, there are documented
instances with Support that substantiate that it does not function properly
in all cases.

NOTE:
Although it is possible to create a /dev/lb0 and use the library, again, it
should not be used.

There should be only one library definition per unit; and as many drive
definitions as there are drives.

The only IBM tape devices at this time that support multiple library
definitions are the:

3494 with up to 8 logical library controllers

7331 / 7336 operated in "split mode" allowing a single unit to operate as
a dual library unit. It will have 2 library devices defined as lb0 and lb1.

3570 operated in "split mode" allowing a single unit to operate as a dual
library unit. It will have 2 library devices defined as lb0 and lb1.

Best Regards,

J. Davis




At 08:14 AM 9/10/98 -0400, you wrote:
>On Thu, 10 Sep 1998, Bill Smoldt wrote:
>> Works both ways actually.  You go back into SMIT and configure the ADSM
>> library and it shows as both devices, lb0 and rmt0.smc.  You can delete the
>> latter.  Or, if you choose to set the library up differently, the control
>> device can be /dev/rmt1.smc, /dev/rmt2.smc, etc.
>>
>> However, the original question was whether it appears as a single library.
>> It does, regardless of which device you choose for configuration.
>
>The 3575 Model 2 can be configured as mulitple logical libraries as a
>customer option.  The original Model 1 could not.  Therefore, with a Model
>2, it can be one library, or more than one library...
>
>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)
>
>