CA Disk backup and archive facilities for VSAM, sequential (PS), and direct (DA) data sets can process datasets that span up to 59 DASD volumes. CA Disk reports handle datasets on any number of volumes. All other functions that encounter multivolume datasets print an error that indicates that the dataset has been bypassed, and then go on to the next dataset.
Processing of multivolume datasets requires that the dataset be cataloged. The volume serial numbers found in the catalog determine the location of all the parts of the dataset. An improperly cataloged dataset can cause loss of data.
In implicit mode, CA Disk selects multivolume VSAM for processing whenever any component is found, even if the data and index components reside on different volumes. For multivolume non-VSAM, selection is made only when the first volume of the dataset is selected for processing.
For non-VSAM datasets, specify if multivolume datasets are processed by including sysparm ARCMULTI for explicit archives, or RETMULTI for implicit archive. ARCMULTI is referenced by the archive proc and RETMULTI is referenced by the retain proc. The dms proc does not need a sysparm to process archive multivolume. The default specification is N, which causes CA Disk to bypass archive or backup processing for all multivolume non-VSAM data sets.
CA Disk restores VSAM datasets to multiple volumes as needed, and non-VSAM datasets to either the first volume or to the original volume allocation depending on the value of sysparm PRIALLOC. If there are problems during restore, preallocating the dataset usually solves the problem.
Note: For information about preallocation, see the sysparm description PREALLOCn in the Systems Guide (non-VSAM), or VSPREDEFn (VSAM) in the Systems Guide.
If the restore does not provide the desired results, use the EXTRACT utility, documented in Archive Extract Utility in the Systems Guide, to restore the dataset to one or multiple volumes.
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