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Key z/OS libraries and other important data sets must be protected. The Volume File Scan display shows you which data sets on the system residence (SYSRES) volume or other critical volumes are protected. You can ask for date‑protected data sets that cannot be updated until their expiration date passes. You can ask to see data sets that are protected by password, CA Top Secret, or RACF. Bear in mind, however, that newer releases of CA Top Secret and RACF do not depend on this RACF‑protection flag. You can also ask for all data sets that are not protected.
The Volume File Scan displays the number of extents that each data set comprises. z/OS limits data sets to 16 extents, except for PDSE data sets, which can have up to 123 extents. If a job tries to further expand its extents, an abend occurs. Some key z/OS data sets are permitted only one extent. It is possible that z/OS can hang up if this number is exceeded. Data sets with many extents can indicate poor disk space management procedures.
You do not need any special access permissions to find data sets with the Volume File Scan option. The name, location, and statistics display for each data set selected. The contents of the data set do not display, so access is not required.
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