Horst,
I can send you assembler and VMSES instructions for a working DFSMS exit
FSMRMSHR (RMS Library Partitioning).
FSMRMSHR calls a Rexx EXEC to do its actual work.
You would have to adjust a few assembler lines and names to convert it into
your desired FSMRMDEV exit that calls a Rexx EXEC.
The main effort is the 2 exits have different parameters but should be easy
for adventurous, novice assembler to adjust the parameter references. The
parameter types of FSMRMDEV are a subset of the types used by FSMRMSHR except
for FSMRMDEV's 'Real dev address' bit(16) input parameter for which an example
is probably in the 'z/Vm Application Dev Guide for Assembler'.
John (Novice assembler)
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From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of
Rempel, Horst
Sent: Wednesday, January 30, 2008 7:23 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: DFSMS for VM Exit FSRMDEV
Hello VMers,
we have a problem with DFSMS/RMS for VM and our IBM 3494 TapeLibrary with
mixxed tapedrives 2 x 3490 and 4 x 3590.
When we do mount requests without specifying a real device RMS will try to use
the first available device nevertheless its
a 3490 or a 3590.
So the recommandation from IBM to solve our problem is to modify the exit
FSMRMDEV.
The exit should be written as a assembler program that calls a REXX-procedure
where the logic resides.
I found the following text in the redbook 'Guide to Sharing and Partitioning
IBM Tape Library Dataservers' SG24-4409-02
FSMRMDEV
The real-device-selection exit, FSMRMDEV, can select a device when a real
device address is not specified in the incoming request. Users can provide
their
own device selection algorithm. The product default processing selects the
first
available (unattached) library tape device that can be located. The request
fails
if no devices are available.
Note: This exit becomes highly interesting in an environment of mixed drive
types where getting the correct media-drive match is critical. A
sophisticated exit may be required here, to match a selected device type
to a particular scratch pool being requested, or a volume serial number
within a customer-defined range that represents a certain media type.
Has anyone modified this exit ? I am looking for a sample how to do it ?
I am familar with REXX but not really with assembler. I appreciate any sample.
Kind regards,
Horst Rempel
Berufsgenossenschafthttp://www.bgchemie.de
der chemischen Industriee-mail [EMAIL PROTECTED]
Abteilung EDV/DV-ORG
Kurfürstenanlage 62
69115 Heidelberg
