HP-UX Workload Manager User's Guide

Integration with other products
Integrating with Serviceguard
Appendix D414
http://openview.hp.com.
Now all the application metrics will be in terms of workload (PRM)
groups. That is, your workload groups will be “applications” for the
purposes of tracking metrics.
Integrating with Serviceguard
This section discusses how you can better use WLM with Serviceguard.
The optional HP product Serviceguard provides users and applications
with a high availability environment. Whenever a mission-critical
application becomes unavailable because of a software or hardware
failure, Serviceguard automatically moves the application to another
server or partition.
By using the same WLM configuration on each server in a Serviceguard
cluster, you can better ensure that your workloads achieve their
SLOs—regardless of where they run in the cluster.
The WLM configuration file allows you to inform wlmd whether a
particular SLO is active on the current server. System resources
assigned to the inactive SLOs’ associated workloads become available to
workloads with active SLOs.
An active SLO is an SLO that WLM is trying to enforce. All SLOs are
active by default. An SLO’s time as active can be limited through
condition and exception statements in the slo structure in the
configuration file. These statements allow you to make SLOs active
based on time or on a metric’s value. You can use a metric’s value to
indicate whether a Serviceguard package is active.
Consider the example in Figure D-2. There are two servers in a
Serviceguard cluster. One server runs two packages, while the second
server runs one package. In this case, all packages are able to
comfortably meet their SLOs. However, Server1 crashes in the middle of
the night. Its packages then fail over to Server2. Now that Server2 has
three packages, there is concern about the packages meeting their SLOs.
When packages failover, WLM realizes—because of condition
statements in the configuration file—that new packages have appeared.
Based on the packages’ priorities, WLM allocates resources to the
packages so they can potentially still achieve their SLOs.