MVS tape prefix

Hi Michael,
  You cannot change the prefix for a tape devclass on MVS, that would
make any existing tapes unusable.  What you can do is set the prefix
when the devclass is defined, so you will need to define a new devclass
with the ADMS.P prefix.
  Carol Trible
  ADSM Development

 referenced append follows:
------------------------------
   Date:    Tue, 18 Feb 1997 14:25:32 -0500
   Date:    Tue, 18 Feb 1997 14:25:32 -0500
   From:    Michael Knutson <MSKNUTSO AT HEWITT DOT COM>
   Subject: ADSM Newbie Question about Tapes ...

   Hello! As new ADSM users currently evaluating the product on an MVS server,
   we're wondering:

   ** How can we change the dataset name prefix for devclass Cartridge and
   devtype CARTRIDGE ???? We want to change ADSM to ADSM.P so that tape DSNs
   follow our "standard."

   adsm> q devclass cartridge f=d

                Device Class Name: CARTRIDGE
           Device Access Strategy: Sequential
               Storage Pool Count: 0
   Last Update by (administrator): MSKNUTSO
            Last Update Date/Time: 02/18/1997 13:51:04
                      Device Type: Cartridge
            Maximum Capacity (MB):
          Estimated Capacity (MB): 180.0
              Dataset Name Prefix: ADSM
                      Mount Limit: 2
            Mount Retention (min): 60
                       Label Type: IBMSL
                  Expiration Date:
                 Mount Wait (min): 60
                        Unit Name: TAPE
                           Volser:
                      Compression: Yes
                       Protection: No
                        Retention:

   We've tried using the UPDATE syntax as shown in the manual using the
   PREFIX= parameter, but ADSM says NOPE. We have successfully changed
   expiration date to 99365,

   adsm> update devclass cartridge exp=99365
   ANR2205I Device class CARTRIDGE updated.

   so we're puzzled about the PREFIX parm. Here's what happens:

   adsm> update devclass cartridge prefix=adsm.p
   ANR5503E UPDATE DEVCLASS: Invalid parameter for update - PREFIX.
   ANS5102I Return code 3.

   BTW, this is the Windows NT command line admin client ... haven't tried it
   from SERVER_CONSOLE (MVS).

   Arggghhhhh ...

   TIA!! Michael

   Michael Knutson
   Hewitt Associates LLC
   Computer Resource Management - Lincolnshire (LS 98)
   telephone: (1)(847) 295.5000 x14549
   e-mail: michael_knutson AT hewitt DOT com