Defining separate libraries had occurred to me, but it seems like it
could also be dangerous, if both logical libraries were to try to check
in the same volume using a search. How do I avoid that? That is, if I
create two libraries, one of them with the LTO-4 drives and the other
with the LTO-5 drives, both libraries will have access to all the tape
slots. Does this mean I cannot use CHECKIN LIBVOL SEARCH=YES but instead
I should check in new volumes by name? Would this be similar to sharing
a physical library with another application, except that the other
application happens to be the same TSM server?

This configuration of two logical library definitions for one physical
library would appear to have some risks. Or is it safe? Are there any
other problems I should expect with this kind of configuration?

Roger Deschner      University of Illinois at Chicago     rogerd AT uic DOT edu



On Tue, 12 Jun 2012, Remco Post wrote:

>did you define separate libraries for those device classes?
>
>On 12 jun. 2012, at 08:15, Remco Post wrote:
>
>> check the format= option on your device class...
>>
>> On 12 jun. 2012, at 08:02, Roger Deschner wrote:
>>
>>> We have a tape library (Oracle/Sun/STK SL500) which contains both LTO-4
>>> and LTO-5 drives, and both LTO-4 and LTO-5 media. I am trying to keep
>>> TSM from mounting an LTO-4 cartridge in an LTO-5 drive, but it is
>>> insisting on doing it anyway.
>>>
>>> We have 4 LTO-4 drives and 3 LTO-5 drives. The mount limits for the two
>>> devclasses are set accordingly - to 4 for the LTO-4 devclass and 3 for
>>> the LTO-5 devclass. When a request to mount an LTO-4 cartridge comes, it
>>> seems to use any of the 7 drives, regardless of whether it is an LTO-4
>>> or LTO-5 drive. Therefore some tape mounts for LTO-5 cartridges are
>>> failing or being delayed due to there being no available LTO-5 drives
>>> when some of them are occupied by LTO-4 tapes. This is despite the claim
>>> in the section of the TSM Administrator's Guide for AIX servers titled
>>> "Mount limits in LTO mixed-media environments" (on book page 221 /
>>> physical page 249 in TSM V6.2 for AIX, or book page 198 / physical page
>>> 232 at V6.3) that setting the mountlimit to the actual number of
>>> earlier-generation drives will prevent the use of later-generation
>>> drives for the earlier-generation devclass.
>>>
>>> BTW, this is a library manager configuration, which may complicate
>>> things. The devclass definititions do match on the library manager and
>>> both of its library clients. The library manager is at 6.2.2.30, and its
>>> two clients are at 5.5.6.0 and 6.2.2.30.
>>>
>>> So, the question is, how do I prevent LTO-4 cartridges from being
>>> mounted in LTO-5 drives? I would prefer not to use the hardware library
>>> partitioning feature, which has its own set of hassles.
>>>
>>> Roger Deschner      University of Illinois at Chicago     rogerd AT uic DOT 
>>> edu
>>> ==== "NO OVERNIGHT CAMPING AUTOMATIC SPRINKLER SYSTEM IN OPERATION" ====
>>> ==== --sign, I-70 rest area, Parachute, Colorado =======================
>>
>> --
>> Met vriendelijke groeten/Kind Regards,
>>
>> Remco Post
>> r.post AT plcs DOT nl
>> +31 6 248 21 622
>
>--
>Met vriendelijke groeten/Kind Regards,
>
>Remco Post
>r.post AT plcs DOT nl
>+31 6 248 21 622
>