QUERY PAGING

Read syntax diagramSkip visual syntax diagram Query PAGING

Authorization

Privilege Class: B, E

Purpose

Use the QUERY PAGING command to display settings for the paging subsystem.

Usage Notes

  1. Use the PAGING statement in the system configuration file to define the paging subsystem's settings at IPL.

    For compatibility, the Alias and HPF settings can also be specified on the FEATURES statement in the system configuration file, using the PAGING_ALIAS and PAGING_HPF operands. However, it is recommended that you consolidate your paging options on the PAGING statement.

    You can use the SET PAGING command after IPL to alter the paging subsystem's settings.

  2. HyperPAV aliases allow concurrent I/O requests to the same physical volume by using alias devices. Aliases do not have associated storage and can be bound dynamically to base volumes. Using HyperPAV can increase throughput by reducing queuing at the device level.
  3. High Performance FICON improves paging efficiency through its support for transport mode channel program format. With transport mode, less overhead occurs between the channel subsystem and the FICON adapter than with traditional command-mode I/O. This results in higher I/O rates and less CPU overhead.
  4. The warning value is also used by the SET STORAGE command to make sure that a storage removal does not cause paging volumes to exceed this level of allocation. For more information, see SET STORAGE.

Responses

Response 1: 

PAGING_ALIAS: {ON}          PAGING_HPF: {ON}          WARNING: nnn%
              {OFF}                     {OFF}
PAGING_ALIAS
indicates the state of the HyperPAV alias feature of the paging subsystem.
PAGING_HPF
indicates the state of the HPF feature of the paging subsystem.
ON
the feature is active
OFF
the feature is not active
WARNING nnn%
is the allocation warning level for paging volumes, as specified on a PAGING system configuration statement or a previous SET PAGING command. The nnn value is a decimal integer in the range of 0 to 100. If no WARNING value has been specified, this value is 90%. If the number of allocated paging slots reaches this percentage of total slots on all paging volumes, message HCP401I is issued to alert the system operator. This value also serves as the default MAXPAGEFULL setting for a SET STORAGE command to ensure a storage removal does not cause paging volumes to exceed this level of allocation. See SET STORAGE for more information.

Messages

  • HCP003E Invalid option - {option | command contains extra option(s) starting with option}