Information Media

Configuring mksysb image on system backup tapes

Use the mksysb command to ensure that the boot image, BOS Installation/Maintenance image, and the table of contents image are created with a tape block_size value of 512.

Bootable mksysb tapes comprise the following images:

·         Boot image

·         BOS Installation/Maintenance image

·         Table of contents image

·         System backup image

The system backup image is the actual backup of the files in the rootvg in all JFS-mounted file systems.

The boot image, BOS Installation/Maintenance image, and the table of contents image must be created with a tape block_size value of 512. The mksysb command ensures that the block size is 512 when these images are created. There are no restrictions on the block size used for the fourth (system backup image) on the tape. The block size of the system, before it was temporarily set to 512, is used for the fourth image on the tape.