CTLUNIT

Purpose

The CTLUNIT subcommand causes the Cached Control Units Screen (FCX176) to be displayed.

Format

Read syntax diagramSkip visual syntax diagramCTLunit

Usage

  1. The whole analysis is based on counters which are updated within the cached control units. These counters reflect the load and behaviour of specific disks, but they do not tell where the I/O came from. If several systems share a control unit, the total of all activity on the control unit is displayed, and not just the I/Os from the system which is doing the analysis.
  2. The same problem exists for systems which are running second level. An analysis by the second level system will include any I/O activity to the same control units from the first level system.
  3. This report works correctly only if every logical control unit (LCU) to which your system is attached has a unique subsystem ID (SSID).

Parameters

No parameters are allowed or tested for.

Results

See FCX176, Cached Control Units Screen – CTLUNIT.