System Programmer Reference › Backing Up Data › Backup Formats › Logical Backups

Logical Backups

When backing up minidisks logically, CA VM:Backup identifies the type of minidisk being processed, then determines the appropriate backup format. CA VM:Backup first attempts a CMS-formatted backup. If it is not successful, CA VM:Backup performs a physical backup according to the minidisk device type.

CA VM:Backup performs a physical backup when the minidisk:

• Is a non-CMS minidisk
• Contains a file that has an invalid CMS format
• Is reserved
• Contains a recomputed portion; only the recomputed portion is backed up physically
• Continues to change during backup and the number of backup attempts specified in the backup job template file has been exceeded. For more information, see Minidisks That Are Changing During Backups.

When backing up SFS or BFS data logically, CA VM:Backup uses SFS format. For details, see SFS Backups.