The CA Disk functional capability detects and processes data sets with external problems, such as obsolete or unused data sets. The processing technique as described previous also allows detection of internal problems or unusual conditions within the data sets, disk packs or catalogs themselves. Historically, this second type of detection has not been available at all (or only after it was far too late — an invalid data set shuts down a monthly job six hours into the run, and all the track-image backups contain the same invalid track images). Consequently, users can be surprised by some of the diagnostic messages issued when CA Disk is first implemented.
If continued CA Disk processing does not hinder the integrity or recovery of the resource a message is issued and execution proceeds. If the condition invalidates the previous, messages are issued and the resource is bypassed if possible. Both of these cases provide the user with quick identification of problems, and hence the opportunity to make corrections in a more timely manner.
For example, if the directory of a PDS has been written over, default processing will issue messages to this effect and refuse to copy it to tape. Recovery of the valid backup copy of the data set can now be accomplished prior to its actual need, an ability that is usually greatly appreciated and much preferred over discovering too late that the backup copies are just as bad as the on-line data.
For more information, see Processing PDS that Contain Anomalies in the Systems Guide.
Following are some of the types of diagnostics that can be expected:
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