Joined: 02 Jan 2009 Posts: 115 Location: Hyderabad
Hi, Can someone clarify the following things?
1. What is the need of Management class and data class and what do they mean actually. ( while allocating a new dataset)
2. How do we set a password to a dataset. What is the use of "Data Set Password . . (If password protected)" in dataset utility menu
3. While allocating a new dataset, we have an option to set "Expiration date". What does it do? I tried using it. I have created a pds on 1-jan-2009 and i gave the expiration date as 2-jan-2009. But the is not deleted/migrated on 2-jan-2009.
Note: This parameter is used by MVS only if SMS (System Managed
Storage) is installed and operational.
The DATACLAS parameter provides the data class to be used for a
sequential data set, a PDS, or a VSAM data set that you are
creating. The class name must be one of those pre-established by
the storage administrator at your site. The data class, once
defined, provides attributes for the data set that were previously
supplied via JCL, such as DSORG, RECFM, LRECL, KEYLEN, key offset
SPACE values, RETPD or EXPDT, and certain VSAM SHROPTIONS.
The values derived from the DATACLAS can be overidden by the RETPD,
LRECL, DSORG, RECFM, KEYLEN, KEYOFF, AVGREC, SPACE, and EXPDT JCL
parameters if they are coded on the same DD statement.
Description: MGMTCLAS = Management Class (JCL Keyword)
a) A collection of management attributes, defined by the
storage administrator, used to control the release of
allocated but unused space; to control the retention,
migration, and backup of data sets; to control the
retention and backup of aggregate groups, and to control
the retention, backup, and class transition of objects.
b) A policy object that users can bind to each file to
specify how the server manages the file. The management
class can contain a backup copy group, an archive copy
group, and space management attributes. The copy groups
determine how the ADSM server manages backup versions or
archive copies of files. The space management attributes
determine whether files are eligible for migration from
2. I would steer clear of dataset passwords, let your security packages take care of that.
3. an expiry date just means that the dataset is not eligible to be deleted until the date has expired. Again, if it's a dasd dataset, I would refrain from using expiry dates.
By the way for DATACLAS I would like to add, DATACLAS is used primarily by storage management to classify and manage the dasd resource of the organization. This includes allocating the appropriate dasd by data/business classification, defining the migration strategy for datasets by rule to ensure space availabbility, and is often an integral part of the overall backup strategy.