The non-SMS volumes are not automatically processed like the SMS ones, you
have to specify them specifically.  You use the ADDVOL parameter (look in
the HSM Storage Administration Reference for ADDVOL).  You don't specify
ADDVOL for SMS volumes, just the non-SMS one.

Brian Westerman

and From the HSM Primer:

1.5 DFSMShsm functions for non-SMS-managed volumes

For non-SMS-managed volumes, DFSMShsm uses volume parameters to
determine how each data set on the volume is managed.
Dump and restore functions: The dump function for non-SMS-managed
volumes is governed by parameters of the DFSMShsm commands, but it is
performed the same way as for SMS-managed volumes.
Backup and recovery functions: The volume-basis operation of
DFSMShsm for non-SMS-managed volumes causes differences in how
backup is performed. For non-SMS-managed volumes:

• If automatic backup is in effect for the volume, all changed data sets that
DFSMShsm can manage are backed up.

• All data sets processed by a particular DFSMShsm host have the same
backup frequency unless the frequency has been modified for that data
set by a DFSMShsm command.

• All data sets processed by a particular DFSMShsm host have the same
number of backup versions, unless the number of backup versions has
been modified for that data set by a DFSMShsm command.
In addition, you can specify the number of days to retain backup versions of
non-SMS-managed data sets only by command parameters for the entire
system complex.

Space management function: Space management consists of removing
appropriate data sets from the level 0 volumes and reducing the space
occupied on the level 0 volumes by the data sets that remain there. In
removing the data sets, you can have DFSMShsm either delete them entirely
or move them to other DASD or tape volumes. If you move the data sets to
other DASD or tape volumes (ML1 or ML2), they can be automatically deleted
from the migration volumes when they expire.

Differences in the way that DFSMShsm performs space management for
non-SMS-managed data sets include:

• The deletion age and management technique are the same for all data
sets on a volume managed by the deletion (delete by age) technique.

• The deletion age and management technique are the same for all data
sets on a volume managed by the retirement (delete if backed up)
technique.

• The migration age and management technique are the same for all data
sets on a volume managed by the migration technique.

• The time for the data set to remain unopened before migration from ML1
to ML2 volumes is the same for all non-SMS-managed data sets in the
system complex.

A data set migrated from a non-SMS-managed volume can be recalled to an
SMS-managed volume if SMS is active and if the data set meets the
conditions for selecting SMS management for that data set. DFSMShsm
recalls a non-SMS-managed data set to a non-SMS-managed volume only if
the data set does not meet the conditions to become an SMS-managed data
set, or if a command forces the recall to a non-SMS-managed volume.

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