Using SSM Global Application › How SSMGA Works › PREREQ and SSM#GRPLST Resource Column Changes

PREREQ and SSM#GRPLST Resource Column Changes

In addition to updating the GST with LST status information, the system specific subtask examines the PREREQ and SSM#GRPLST resource columns for changes.

• When a cross-system prerequisite specification is detected, a remote status record for both the prereq and subreq relationship between the resources is created or updated.
• These remote records are later read into the LST of the affected local systems for use by the SSM XPREREQ and XSUBREQ process events that are required to evaluate cross-system resource relationships.
• A group membership table (GRT) record is maintained for each defined group name for a resource.
• The system subtask tracks the maximum LST LUTIME processed, which becomes the new GRTIME value in the system record.
• The maximum global status update timestamp (GUTIME) is also recorded in the system record.
• The system subtask updates the LST system record timestamps on the specific system that it processed.

Once the system record is updated in the LST by the global system, the local system processing phase of SSMGAGBL running in the SSM subtask occurs. If the LST system record has a GUTIME that is greater than the maximum GUTIME previously read by local processing (LRTIME) then local processing will read any updated remote status records and any movable resource local records whose GUTIME is greater than LRTIME. Remote status records only exist in the LST. Movable local resource status is propagated to the actual SSM resource records. Non-movable local resource status is never read back from the GST. The highest GUTIME processed by local system processing becomes the new system record LRTIME.