Attribute derivation and definition

This topic clarifies the concepts and values associated with specific attributes of the DFSMSrmm Status feature.

  • Only volumes with a type of PHYSICAL and a status of MASTER or USER are included in when calculating the following statistics:
    • Capacity
    • Utilization
    • Compression
  • Compression, which is meant to represent the percentage reduction of data written from the host that is actually recorded on the tape volume, is calculated as follows:

    1-((Volume Capacity*Volume % Full)/(App Data written to volume))

  • The following attributes include PHYSICAL, LOGICAL, and STACKED volume types:
    • Total volumes
    • Total datasets
    • Average volume use count
    • Average datasets per volume
    • Percent of volumes read/written previous day
  • The following dates are shown as NONEXPIRING in the Days To/Days From attributes that are calculated by OMEGAMON® :
    • 99000
    • 99365
    • 99366
    • 98000
    • 98365
  • The Days Until Expiration attribute displays a positive value to represent a date in the future, while a negative the number represents the days since expiration. Similarly, a positive Days for Retention value signifies the remaining number of days that the dataset or volume is retained, while a negative value indicates the number of days since the retention date.
  • History can be enabled for the DFSMSrmm Summary, Configuration, and CDS tables only. CDS and Configuration data is collected at the interval specified in the History Collection Configuration dialog box of the Tivoli® Enterprise Portal. Summary attributes are written to the history files only once during any collection cycle, because the summary data does not change until the next collection cycle is run.
    • Locations Owners
    • Accounting codes
    • Creating Jobs or Programs
    • Vital Record Specifications (VRS)
    • Volumes and Datasets