To direct an allocation to a specific SMS volume, the Storclass will need to 
have Guaranteed space = YES.
 
If the allocation is to go to a non-SMS volume, why is Dataclas= and Storclas= 
in the jcl?

________________________________

From: Hunkeler Peter (KIUK 3) [mailto:[EMAIL PROTECTED]
Sent: Wed 6/6/2007 7:10 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: explicity coding for STORCLAS & DATACLAS



>After I hard code the VOL=SER=XXXXXX, it will allocate to SMS managed
volume
>
>IEBDG    EXEC PGM=IEBDG
>SYSPRINT DD SYSOUT=*
>OUT      DD DSN=SSMD.TESTXX,DISP=(,CATLG),
>     UNIT=(SYSDA,2),STORCLAS=SC4G,DATACLAS=DC4G,
>     SPACE=(CYL,(2,10),RLSE),VOL=SER=XXXXXX,
>     DCB=(RECFM=FB,LRECL=900,BLKSIZE=0)

What STORCLAS and DATACLAS did the data set actually have in this case?

It seems that your ACS routines do not allow the explicit assignment of
STORCLAS, or perhaps the explicit assignment of STORCLAS SC46.

It further seems that VOL=SER=XXXXXX triggers SMS management of the data
set, be it with the specifed STORCLAS or with one determined by the ACS
routine.


>Any shop using explicitly coding instead of ACS to control?

We've got a need for some data sets to be EXTENDED format PS data sets
which predates DSNTYPE=EXTREQ which came with z/OS V1.7. It was
implemented
via special volume serial number (ABCXYZ) which will be recognized by
the ACS routines. Correct attributes (like DATACLAS) are then assigned.
Seems similar to your VOL=SER=XXXXXX.

We're also allowed to explicitly specify MGMTCLAS even though the ACS
routines will assign one based on the data set name if none is specified
via JCL, ISPF 3.2, etc.


Peter Hunkeler
Credit Suisse

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