HP-UX Workload Manager User's Guide

Configuring WLM
Defining SLOs
Chapter 5 195
Now add a third workload named Payroll with an SLO at the same
priority as those for the other workloads. This workload’s SLO is to
calculate each employee’s overtime, commissions, bonuses, taxes, and
total pay in less than 0.5 seconds. The system is now overloaded and
cannot meet each SLO.
Because each SLO has the same priority, WLM cannot allocate enough
resources to any one workload to help it achieve its SLO. Consequently,
no SLO is met, as shown in Figure 5-4.
Figure 5-4 Additional workload with same priority SLO
In this case, assign the SLOs different priorities so that WLM can
determine how to allocate the limited system resources, allowing at least
one SLO to be met. Other options are to relax the SLOs or purchase more
hardware resources, if the applications are consistently in need of more
resources.
Specifying the workload group to which the SLO
applies (optional)
SLOs govern workloads that are based on workload groups. Therefore,
each workload group must be assigned an SLO. If you want an SLO for a
single application, place that application in a workload group by itself.
Number of transactions
4
3
2
1
AP goal
AR goal
P goal
Response time in seconds
Accounts payable (AP)
Accounts receivable (AR)
Payroll (P)