The virtual tape images are stored as files in the IFS. Refer to the IBM Information Center for all the nitty-gritty details, but in a nutshell it works like this:
- You create an image catalog in the IFS. (CRTIMGCLG)
- You add entries to this image catalog. Each entry is treated as a separate virtual tape volume. (ADDIMGCLGE)
- You create a virtual tape device and vary it on. (CRTDEVTAP and VRYCFG)
- You associate an image catalog with the virtual tape. (LODIMGCLG)
Run your backup like you always do except write to the virtual tape drive instead of a real one. The image catalog files can then be FTPed to a storage system anywhere in the world.
This was first published in April 2008