Migrating from WLM to gWLM

7
Migrating WLM configurations
The gWLM management model has a central management server, or CMS, and the managed
systems, or nodes. The CMS must have HP Systems Insight Manager (SIM) and gWLM installed,
while managed nodes need only gWLM agent software installed. To manage a system with gWLM,
you define a shared resource domain (SRD) to contain workloads on that system. You can use existing
workloads or create new ones. Each workload needs a policy to govern its resource allocation. You
can choose a policy from the collection of policies that come with gWLM or create new ones. You
can apply a single policy to multiple workloads. If you update a policy definition, that update is
automatically used to govern resource allocations for all workloads associated with the policy. The
gWLM interface in HP SIM provides a wizard to step you through the creation of SRDs, workloads,
and policies.
HP recommends using the gWLM interface in HP SIM to configure gWLM. However, you can also
configure gWLM using XML-based files. You create these files according to the syntax described in
the gwlmxml(4) manpage and then import and deploy them using the /opt/gwlm/bin/gwlm
command, described in the gwlm(1M) manpage.
To convert WLM configurations:
1. Determine whether the systems designated to be the CMS and managed nodes can support the
system requirements of HP SIM and gWLM (for the CMS) or just gWLM (for the managed nodes).
Find alternate systems if needed. Install HP SIM and gWLM.
2. Determine the policies to use in place of the SLOs in your WLM configurations.
Both WLM and gWLM provide:
• Fixed SLOs (policies)
• Utilization SLOs (policies)
• Metric-based SLOs (policies) (In gWLM, metric-based policies are available as custom policies.)
gWLM also provides an OwnBorrow policy type, which is based on utilization, that lets you
explicitly indicate how much of a resource a workload should own as well as how much it should
be allowed to borrow and lend.
gWLM comes with a library of polices (SLOs) for you to use. Check whether the provided policies
meet your needs. If not, create the appropriate policies.
3. Create your SRD using the gWLM Manage Systems and Workloads wizard.
For each system to be managed by gWLM, use the wizard to enter the system name and define
the workloads and policies. The wizard produces an SRD and immediately begins managing the
workloads for the specified system.
To access the wizard in HP SIM:
a. Select
Tools –> VSE Management
b. Click the Shared Resource Domain tab
c. Select the menu item
Create –> Shared Resource Domain
Once you have an SRD deployed, you can monitor your workloads by selecting items in the Reports
menu. You can also monitor workloads on the command line using gwlm monitor. (In WLM, when
you are working with FSS-based workload groups or PSET-based workload groups, you have a
default group, PRM_SYS, for system processes. gWLM monitoring tools do not show PRM_SYS.
However, activity in PRM_SYS may still affect the resources available to the workloads you define.)