HP-UX Workload Manager User's Guide

WLM quick start: the essentials for using WLM
Some common WLM tasks
Chapter 2 89
Some common WLM tasks
WLM is a powerful tool that allows you to manage your systems in
numerous ways. The following sections explain some of the more common
tasks that WLM can do for you.
Migrating cores across partitions
WLM can manage SLOs across virtual partitions and nPartitions.
You must use Instant Capacity cores (formerly known as iCOD CPUs) on
the nPartitions for WLM management. WLM provides a global arbiter,
wlmpard, that can take input from the WLM instances on the individual
partitions. The global arbiter then moves cores between partitions, if
needed, to better achieve the SLOs specified in the WLM configuration
files that are active in the partitions. These partitions can be
nested—and even contain FSS and PSET-based workload groups.
(wlmpard can be running in one of the managed partitions or on a
supported platform with network connectivity to the managed
partitions.)
HP-UX Virtual Partitions are software-based virtual systems, each
running its own instance of the HP-UX operating system. WLM can
move processors among these virtual systems to better achieve the SLOs
you define using WLM within each virtual system.
nPartitions (nPars) are hardware-based partitions, each running its own
instance of the HP-UX operating system. Using Instant Capacity
(formerly known as iCOD) software, WLM can manage your SLOs across
nPartitions by simulating the movement of processors among
nPartitions. (The processor movement is simulated by deactivating cores
on one nPartition and activating cores on another nPar.)
Configuring WLM to manage SLOs across virtual partitions and
nPartitions requires the following steps. For details and restrictions, see
Chapter 7, “Managing SLOs across partitions,” on page 255.
Step 1. (Optional) Set up secure WLM communications.
Follow the procedure HOW TO SECURE COMMUNICATIONS in
wlmcert(1M)—skipping the step about starting/restarting the WLM
daemons. You will do that later in this procedure.