When backing up data using CMSALLOC format, CA VM:Backup reads the block allocation map on CMS minidisks to identify which blocks are or are not in use, and physically backs up only those that are in use. Because less data is written to tape, CMSALLOC backups are faster than both CMS backups of all files and physical backups of every block. You can use it to back up data that does not require a file-level restore. Data backed up in CMSALLOC format is device-dependent when it is restored. If you restore a CKD device, the target volume must be the same device class and type as the source volume; for example, you must restore a 3380 device to a 3380 device. If restoring an FBA device, the target volume must be an FBA device.
Note: You cannot use CMSALLOC format for incremental backups.
If you specify a CMSALLOC backup, CA VM:Backup backs up data using this format unless the minidisk:
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