Initiation delays cause the velocity value to decrease. Recalculate and adjust your velocity goals accordingly. See Velocity formula for information on calculating velocity.
Before migrating to WLM batch management, you can estimate the new velocity goal for a service class as follows:
- Run the jobs under normal circumstances
- Examine the initiation delay data:
- In the IWMWRCAA data area, if you are using the workload reporting
services:
- RCAETOTDQ
- Total delay samples, including initiation delay
- RCAETOTU
- Total using samples
- In the SMF type 72, subtype 3 record, if you are using RMF™:
- R723CTDQ
- Total delay samples, including initiation delay
- R723CTOU
- Total using samples
- In the IWMWRCAA data area, if you are using the workload reporting
services:
Include the initiation delay in the velocity formula for an estimate of the new, lower velocity. Plugging this delay data into the velocity formula gives you:
Or:
RMF will do this calculation for you — look for the INIT MGMT field in the RMF Monitor I workload activity report (on the line that begins “VELOCITY MIGRATION:”). See Adjusting velocity goals based on samples included in velocity calculation for more information.
If you had originally given a velocity goal to a service class period only because TYPRUN=HOLD time was included in response time goals, you can now give that service class period a response time goal because the TYPRUN=HOLD time is no longer included in the response time. In this case, you no longer need to recalibrate the velocity goal since it has been replaced with the response time goal.