VLFDATA STATS subcommand output

This report provides statistics pertaining to the usage of VLF. If the optional class is specified, the report shows statistics only for the specified VLF class.

Figure 1. Example: VLFDATA STATS subcommand output (part 1 of 2)

************************** TOP OF DATA *******************************
  BLS18077I VLFDATA processing may not be valid for a VIRTUAL dump

  *** ***    FORMAT VLFDATA     *** ***

     Virtual Lookaside Facility (VLF)

     VLF  address space = ASID(X'0011')

  VLFDATA  subcommand

  *******************************************************************
  *                                                                 *
  *                       VLF Statistics Report                     *
  *                                                                 *
  *******************************************************************

      Number of classes                               17
      DPT termination count                            0
      TRIM termination count                           0


VLFNOTE Statistics:
        Requests to purge a class                      0
        Requests to purge a volume                     0
        Requests to delete a major                     0
        Requests against a minor                       0


Cross-System Notification Statistics:
        Requests to purge a volume                     0
        Requests to delete a major                     0
        Requests against a minor                       0

Major name statistics:
        PDS major names                                3
        PDS major name instances                       0
        Eligible PDS major name instances              0

        Non-PDS major names                           24
        Non-PDS major name instances                   2
        Eligible non-PDS major instances               2

        Majors in transitional states:
          Major names                                  0
          Major name instances                        43


User statistics:
        Number of ASIDs                               64
        Number of ASIDs using VLF                      0
        Maximum number of users in one ASID            0
        Number of active IDENTIFYs                     0
        Number of latent IDENTIFYs                     0


      ***************************************************************

Figure 2. Example: VLFDATA STATS subcommand output (part 2 of 2)

Statistics for class CLASS1
        Class state: Class is not defined but was previously defined.
        Number of successful defines                   1
        MAXVIRT value                                256
        Actual size of obtained data space             0
        Number of majors known to VLF                N/A
        Number of eligible majors                     14
        Number of active IDENTIFYs                     0

        Create statistics:
          Largest object create attempted           2030
          Number of successful creates                 5
          Creates for ineligible majors                0
          No pending create                            2
          Major not in search order                    1

        Retrieve statistics:
          Number of successful retrieves               5
          Object may be the correct one                1
          Target area was too small                    1
          May be correct, area too small               0
          Object not found                             2

        Identify statistics:
          Total number of identifies                   2
          Duplicate identify requests                  0
          Unsuccessful identifies                      0
          Current identifies                           2
          Maximum active identifies                    2
          Maximum search order length                  4
        .
        .
        .

The following information appears in this report:

VLFNOTE STATISTICS: This section provides selected VLFNOTE macro statistics.

Requests to purge a class - The number of times VLFNOTE macro was invoked to delete a class.
Requests to purge a volume - The number of times VLFNOTE macro was invoked to delete a volume.
Requests to delete a major - The number of times VLFNOTE macro was invoked to delete a major name.
Requests against a minor - The number of times VLFNOTE macro was invoked to add, update, or delete a minor name.

CROSS-SYSTEM NOTIFICATION STATISTICS: This section provides selected statistics about notification this system received about changes made to shared data by other systems in the same sysplex. These statistics only apply to data in a PDS class.

Requests to purge a volume - The number of times that a request to delete a volume was processed as a result of notification to this system about changes made to shared data by another system.
Requests to delete a major - The number of times that a request to delete a major name was processed as a result of notification to this system about changes made to shared data by another system.
Requests against a minor - The number of times that a request to add, update or delete a minor name was processed as a result of notification to this system about changes made to shared data by another system.

VLF GENERAL STATISTICS: This section provides selected VLF statistics.

Number of classes - The number of classes currently known to VLF.
DPT termination count - The number of times the delayed processing task (DPT) failed.
TRIM termination count - The number of times trim task failed.

MAJOR NAME STATISTICS: This section provides selected major name statistics.

PDS major names - The number of unique major names in VLF that belong to a PDS class.
PDS major name instances - The number of PDS major names in VLF. Each major name may belong to more than one class.
Eligible PDS major name instances - The number of PDS major name instances that are allowed to have objects stored in VLF.
Non-PDS major names - The number of unique major names in VLF that belong to a non-PDS class.
Non-PDS major name instances - The number of non-PDS major names in VLF. Each major name may belong to more than one class.
Eligible non-PDS major name instances - The number of non-PDS major name instances that are allowed to have objects stored in VLF.
Major names in transitional states - The number of unique major names that are being deleted.
Major name instances in transitional states - The number of major names that are being deleted from particular classes.

USER STATISTICS: This section provides selected VLF user statistics.

Number of ASIDs - The number of address spaces known to the system.
Number of ASIDs using VLF - The number of address spaces that have tasks using VLF.
Maximum number of users in one ASID - The maximum number of users identified to one address space.
Number of active IDENTIFYs - The number of users currently identified.
Number of latent IDENTIFYs - The number of users that were once identified but are not currently active.

CLASS STATISTICS: This section provides selected VLF class statistics.

Class state - The current state of the class, which is one of the following:
- Defined - The class is active and available for use.
- Being defined - The COFDEFIN macro has been invoked for this class, but has not completed processing.
- Being purged - The COFPURGE macro has been invoked for this class, but has not completed processing.
- Undefined
  - Previously defined - The class was defined and purged, and has not been redefined.
  - Never defined - The class is listed as a VLF class in the COFVLFxx parmlib member, but has never been defined.
Number of successful defines - The number of times the class was defined.
MAXVIRT value - The maximum size of object storage for this class in 4-kilobyte blocks.
Actual size of obtained data space - The actual size of the object storage obtained for this class in 4K blocks.
Number of majors known to VLF - The number of major names known to VLF that belong to this class.
Number of eligible majors - The number of major names belonging to this class that are allowed to have objects stored in VLF.
Number of active IDENTIFYs - The number of users currently identified to this class.