Use catalog shadowing to create a copy of an existing image catalog.
Use the Create Image Catalog (CRTIMGCLG) command to create a copy of an image catalog. The reference image catalog contains information about images. The dependent image catalog is a copy of the reference image catalog at a single point in time when the Create Image Catalog (CRTIMGCLG) command was performed.
CRTIMGCLG IMGCLG(dependent) DIR(*refimgclg) REFIMGCLG(reference)
There can be up to 35 ready dependent catalogs pointing to one reference catalog. Each of the tape reference catalogs are read only and write accessible. However optical reference and all dependent image catalogs are read-only and can be used for restore operations.
In order to delete the reference catalog or to delete any one image file all of the dependent image catalogs must be deleted first. The volume name for the optical dependent catalogs has a four character prefix. The prefix is added once the optical dependent catalog is made ready. Use the Work with Image Catalog Entries (WRKIMGCLGE) to find the optical dependent volume name.
