z/OS Security Server RACF Security Administrator's Guide
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Tape volume table of contents (TVTOC)

z/OS Security Server RACF Security Administrator's Guide
SA23-2289-00

RACF® creates and maintains the TVTOC for tape volumes that:
  • Are defined using the RDEFINE command with the TVTOC operand
  • Contain tape data sets protected by using the ADDSD command
  • Contain tape data sets protected by specifying PROTECT=YES on the JCL DD statement
  • Contain tape data sets created by a RACF-defined user who has the ADSP attribute
The TVTOC contains the following information:
  • The number of data sets on the volume
  • The full 44-character name used when creating the data set (from the DSN operand of the JCL DD statement)
  • The volume serial number of each volume on which the data set resides (from the VOL operand of the DD statement)
  • The file (data set) sequence number (from the LABEL operand of the JCL DD statement)
  • The RACF internal data set name (from the naming conventions table or an installation exit routine)
  • The data set creation date
  • For each data set on the volume, an indicator that is set if the data set is protected by a discrete profile

You can list the information in the TVTOC of a tape volume profile by using the RLIST command. For more information, see z/OS Security Server RACF Command Language Reference.

RACF makes entries in the TVTOC when a user:
  • Opens a new data set on a predefined tape volume, or
  • Protects a new or existing tape data set using RACF
RACF then uses the information during access checking.
Note:
  1. The maximum number of entries for data sets that a TVTOC can contain is 500.
    Important: Processing that creates large numbers of TVTOC entries and large access lists might result in an attempt to exceed the maximum profile size.
  2. The maximum number of volumes that any data set on the tape with an entry in the TVTOC can span is 42.
  3. The maximum number of volumes that any data set on tape without a TVTOC can span is limited only by the maximum profile size.
When both TAPEDSN and TAPEVOL are active, RACF can create two different types of TVTOC profiles:
  • An automatic TVTOC tape volume profile
  • A nonautomatic TVTOC tape volume profile
  • The NOSET option on the DELDSD command can be used to remove a discrete tape data set profile without deleting the tape volume profile. For more information, see z/OS Security Server RACF Command Language Reference.

The sections that follow describe these profiles.

Parent topic: Tape volume profiles that contain a TVTOC

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