Chris Hopkins wrote:
>
> In discussions with IBM support regarding sharing drives between two RS6000s
> I was told that a drive CANNOT be shared.  It must be 'given' to one ADSM
> installation.  Furthermore, if you run the server twice on the same CPU, you
> must still allocate a drive to a server and CANNOT share it between the two
> servers.
>
> Our drives are dual ported via SCSI.  I am not sure if this has anything to
> do with the limitation between CPUs.  The restriction applying to multiple
> servers on the same CPU is a real shortcoming in my opinion.
>
> Disclaimer:  I have not seen any of this on paper either!!!
>
> >One uses the Define Drive command to specify the tape drives which
> >ADSM may use in a given 3494 Library.  If two RS/6000s will be
> >accessing that Library, is there any need to dedicate the 3494's
> >tape drives to each accessing RS/6000?  (Much in the same way that
> >tapes are segregated by category codes associated with each Library
> >name.)  The manuals don't talk about this one way or the other.
> >From my research I believe that with the Reserve/Release functions
> >provided in the device driver that there should be no need to
> >dedicate tape drives.  That is, each RS/6000 can use any free drive.
> >But I want to make sure...
> >      thanks,  Richard Sims, Boston University OIT
> >
> >
> ----------------------------------------------------------
> Chris Hopkins                          cjhopkin AT on.bell DOT ca
> Sr. System Designer
> Highway 407 Electronic Toll Collection System
> Bell Sygma Telecom Solutions
> Toronto: (416) 215-2910
> Ottawa:  (613) 781-4544
> ----------------------------------------------------------    Chris, we have 
> solved this by buying a GRAU robotic tape Library,
        it uses exactly the same drives as the 3494. We are sharing 8
        drives between 2 ADSM servers.

        Brian Johnson BT (British Telecom)
        Open Systems Storage Management Group