Explanation: INTERVALMIGRATION and NOINTERVALMIGRATION
are mutually exclusive, optional parameters specifying whether DFSMShsm
should perform interval migration. The purpose of interval migration
is to prevent the DFSMShsm-managed volumes from running out of space
during the day. DFSMShsm normally does a space check every hour. Therefore,
if you request interval migration, DFSMShsm uses this hourly space
check to determine on which volumes interval migration is done.
INTERVALMIGRATION specifies that interval migration is performed.
NOINTERVALMIGRATION specifies that interval migration is not performed.
SMS relationship: Parameter differs in meaning
when applied to SMS-managed or non-SMS-managed DASD volumes or data
sets.
SETSYS default: None.
DFSMShsm default: If you do not specify either
parameter on any SETSYS command, the DFSMShsm default is INTERVALMIGRATION.
Note: - If you want the operator to decide whether interval migration
should be allowed after DFSMShsm decides it is necessary, specify
the INTERVALMIGRATION parameter and the REQUEST parameter. Interval
migration does not occur during the DFSMShsm startup process.
- With Tape Mount Management (TMM), interval migration can still
be performed on SMS volumes in a storage group having the attribute
of AUTO MIGRATE=I, regardless of the setting for the SETSYS INTERVALMIGRATION
parameter or the SETSYS NOINTERVALMIGRATION parameter.
- Only primary space management will be performed on SMS volumes
in a storage group having the attribute of AM=P. When this attribute
is specified, interval migration is not performed even if the SETSYS
INTERVALMIGRATION parameter is specified.