If a bitmap exists for a shadow set
member, a minicopy operation starts by default when you specify the
MOUNT command to return a shadow set member to the shadow set. This
is equivalent to using the /POLICY=MINICOPY=OPTIONAL qualifier to
the MOUNT command. If a bitmap is not available, a full copy occurs.
An example of using the /POLICY=MINICOPY=OPTIONAL
qualifier with the MOUNT command follows:
$ MOUNT DSA5/SHAD=$4$DUA0/POLICY=MINICOPY=OPTIONAL volume-label
If the shadow set (DSA5) is already mounted and
a bitmap exists for this shadow set member ($4$DUA0), the command
adds the device $4$DUA0 to the shadow set with a minicopy operation.
If a bitmap is not available, this command adds $4$DUA0 with a full
To ensure that a MOUNT command succeeds only if
a minicopy can take place, specify /POLICY=MINICOPY only (that is,
omit =OPTIONAL). If a bitmap is not available, the mount fails.