RESTORE/RECOVER › Restore and Recover of VSAM Clusters › Restoring to Predefined and Reusable Clusters

Restoring to Predefined and Reusable Clusters

CA Disk allows restoring to predefined and reusable clusters by specifying sysparm VSPREDEF with a value of Y. CA Disk in determining when to use a predefined or reusable cluster's definition, employs the following logic:

1. An attempt to define the entity is performed. If the define is successful, the cluster was not predefined and normal restore procedures are used.
2. If the define failed because the entity already exists, a check is made to determine if the SCRATCH parameter was specified on the RESTORE or RECOVER command. If it was specified, the cluster is scratched and redefined, regardless of the value specified in sysparm VSPREDEF.
3. If the define failed and SCRATCH was not specified, but VSPREDEF is specified with a Y, the cluster's attributes are retrieved from the current (predefined) definition. If it is defined as reusable, and is not an empty cluster, it is opened with the reusable option and the restore continues. Otherwise, the restore for the data set is bypassed.

Note: When restoring data sets using the predefined or reusable option, CA Disk has to assume that the definition that has been found is indeed correct. Since it cannot be, CA Disk can assume no responsibility for the validity of the restored data. This option should only be used with the utmost care. Also note that empty clusters will not be restored over an existing data component when VSPREDEF is specified without the SCRATCH parameter.