Start a bitmap.

A 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 bitmap with the MOUNT command when mounting a shadow set less one or two members, as described in “Creating a Bitmap With MOUNT”.

Use the bitmap for a minicopy operation when you return the shadow set member to the shadow set.

If a 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 bitmap does not exist for a minicopy, the mount fails.

When a minicopy operation is completed, the bitmap associated with the disk is deleted.