Start a write
bitmap. A write bitmap
is started by specifying the new qualifier /POLICY=MINICOPY[=OPTIONAL]
to the DISMOUNT command when removing a member from a shadow set. You can
also start a write bitmap with the MOUNT command when mounting a
shadow set less one or two members, as described in
Creating a Write Bitmap With MOUNT.
Use the write bitmap for a minicopy operation when
you return the shadow set member to the shadow set. If a write bitmap exists for the shadow set, a minicopy operation
is invoked by default by the following MOUNT command:
$ MOUNT DSA42/SHAD=$4$DUA42 volume-label
To guarantee that only a minicopy takes place, use the /POLICY=MINICOPY
qualifier, as shown in the following example:
$ MOUNT DSA42/SHAD=$4$DUA42 volume-label/POLICY=MINICOPY
If a write bitmap does not exist for a minicopy, the mount
fails. When a minicopy operation is completed, the write bitmap associated
with the disk is deleted.