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Appendix D. Data Sets with SMS
For example, you can select the data class named DCLAS01 for a new data set
with:
//SMSDS1
DD
DSNAME=MYDS1.PGM,DATACLAS=DCLASð1,DISP=(NEW,KEEP)
In the example, SMS uses the attributes in the data class named DCLAS01 to
manage the data set. The installation-written ACS routines can select the
management class and storage class.
Note that an ACS routine can override the data class, management class, or
storage class that you specify.
Overriding Attributes Defined in the Data Class
For a new data set, you can, if needed, override the data class attributes defined in
the data class for the data set by coding one or more of the following DD
parameters:
RECORG (record organization) or RECFM (record format)
LRECL (record length)
KEYLEN (key length)
KEYOFF (key offset)
DSNTYPE (type, PDS or PDSE)
AVGREC (record request and space quantity)
SPACE (average record length, primary, secondary, and directory quantity)
RETPD (retention period) or EXPDT (expiration date)
VOLUME (volume-count)
For example:
//SMSDS2
//
DD
DSNAME=MYDS2.PGM,DATACLAS=DCLASð2,DISP=(NEW,KEEP),
LRECL=256,EXPDT=1996/ð33
In the example, the logical record length of 256 and the expiration date of February
2, 1996, override the corresponding attributes defined in the data class for the data
set.
With SMS, you can associate a data class with any new data set, (whether or not it
is system-managed). If you do not specify one or more of the DD parameters listed
earlier (RECORG, RECFM, LRECL, KEYLEN, and so forth), the system uses the
defined data class attributes.
For an existing system-managed DASD data set, note that you cannot use the
volume-count subparameter to override the current volume count. (If you use the
subparameter, the system ignores your specification and uses the current volume
count.)
Overriding Attributes Defined in the Management Class
There are no attributes in the management class that you can specify via JCL. The
storage administrator at your installation controls the migration and backup of
SMS-managed data sets.
Appendix D. Data Sets with SMS
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