4. FILES › 5.1 TLM Component Files › 5.1.2 TMC Information Area Files › 5.1.2.1 Tape Data Set File (TMCTMD)

5.1.2.1 Tape Data Set File (TMCTMD)

The Tape Data Set file contains information about individual
 tape data sets managed by the tape management system.
 
 At the DETAIL timespan, the TMCTMD file contains one record
 for each active tape data set.  For tape data sets that
 reside on a single volume, there is one record in the DETAIL
 timespan TMCTMD file.  For multivolume tape data sets, there
 are multiple records, one for each data set segment on each
 of the tape volumes spanned.

 
 Tape data sets created during the TMCC scan process are
 deemed 'Future' data sets.  When the TMCC scan starts, it
 sets the ENDTS (End timestamp) to base all duration
 calculations on.  Tape data sets created during the TMCC scan
 process will have a later create date than the ENDTS which
 would result in negative durations and invalid calculations
 based off timestamp durations.  To preserve data integrity,
 these 'Future' data sets are discarded during DAY091 input
 processing and the count of 'Future' data sets dropped is
 displayed in a MICSLOG message.
 
 At summarized timespans, Data Set Name (DSNAME) and VOLSER
 are dropped.  Tape Library Identifier (TAPELIB), TMS Product
 Name (TLMPROD), TLMACTn account codes, Volume Group
 (VOLGROUP), and Storage Class related data elements serve as
 summarization keys.  This significantly reduces the volume of
 summarized TMCTMD timespan files.  It is important that due
 consideration is given in setting the TLMACTn and VOLGROUP
 summarization key values so that summarized timespans meet
 organizational reporting, chargeback, and analysis
 requirements.
 
 The following sections describe the file's organization, list
 the data elements maintained, and provide usage hints.
 
     1 - TMCTMD File Organization
     2 - TMCTMD Data Elements List
     3 - TMCTMD Usage Considerations
     4 - TMCTMD Retrieval Examples