If a write 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 write 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 write 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
write bitmap is not available, this command adds $4$DUA0 with a
full copy.
To ensure that a MOUNT command succeeds only if a minicopy
can take place, specify /POLICY=MINICOPY only (that is, omit =OPTIONAL).
If a write bitmap is not available, the mount will fail.