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The use of expiration attributes and retention limit z/OS DFSMSdfp Storage Administration SC23-6860-01 |
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DFSMShsm determines if a data set has
expired based on the expiration
date found in the catalog entry of the data set. OAM determines if
an object has expired based on the expiration date in its object directory
entry. If an expiration date is not found, DFSMShsm and OAM use the
management class expiration attributes. These attributes are used
as follows:
Tip: If you want to change
the expiration date in a catalog entry, you can either use the access
method services ALTER command or you can specify either the RETPD
or EXPDT parameter in the JCL for an old managed non-VSAM data set,
as long as the new expiration date is valid based on the retention
limit specified. See z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support for
information on changing the expiration date of an object.
Data sets or objects having the INTERIM management class defined in Defining management class expiration attributes become eligible for expiration when both of the following criteria are met: at least seven days since allocation and not referenced in the last two days. Table 1 shows several combinations of retention
attributes used for space management processing. Use the highlighted
values for each instance.
In Case 3, the user-specified or data class values fall within the retention limit. So, DFSMShsm uses the values of 60 and 60. OAM uses a RETPD value of 60, because OAM does not consider EXPDT. In Case 4, the RETPD and EXPDT are used because the retention period value is NOLIMIT. In Case 5, because no user-specified or data class derived values are available, DFSMShsm and OAM use the values specified in the management class expiration attributes which are shown on the Management Class Define panel. After you specify the expiration attributes, issue the DOWN command to see the next page of the Management Class Define panel, on which you can specify the migration attributes. |
Copyright IBM Corporation 1990, 2014
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