32 Converting to DFSMSrmm from TLMS
You can create a vital record specification chain to cause a sequence of volume
moves. The first vital record specification in the chain is a data set name, SMS
management class, DFSMSrmm management value or volume vital record
specification. These specify one location in which the data set or volume being
retained is to be stored. You would add one name vital record specification for
each additional location or retention value that applies to the volume or data set.
DFSMSrmm records the starting location for a volume when the volume is
initially defined to DFSMSrmm, or when the volume information is changed. This
starting location is known to DFSMSrmm as a home location. Home is the place
from which volumes start, and to which they are returned, when the identified
retention and movement actions have been completed.
Data set retention
You use data set names and data set name masks to define retention policies for
data sets, and you use job names and job name masks to define retention
policies to further qualify the criteria for applying retention and movement
policies. For data sets, you can request the following types of retention.
Retention by PARMLIB option - VRSEL(NEW|OLD)
You can control the extent to which data set name and management value
VRSs are used. You can define different retention criteria in a next VRS only if
you specify VRSEL(NEW).
Retention by cycles
You can retain a minimum number of cycles or copies of a data set. This type
of retention applies to generation data groups (GDGs) or like-named data
sets identified by pseudo-GDG data set names. For non-GDG data sets,
DFSMSrmm considers each occurrence of a data set to be a cycle.
Retention by BYDAYSCYCLE
You can specify to retain all instances of a data set created on a single day as
a single cycle.
Retention until expired
You can retain a data set until volume expiration date has been reached or the
retention amount has elapsed.
Retention by number of elapsed days
You can retain each copy of a data set a given number of days since it was
Retention by days since last referenced
You can retain each copy of a data set for a set number of days since the data
set was read or written.
Retention while data set is cataloged
You can retain any data set as long as it remains cataloged. Catalog status