Shutdown Procedures - IBM Power Systems 775 Manual

Many sites include more utility node types such as login nodes or nodes responsible for
backup. After the xCAT service nodes are set up in the diskless environment and the GPFS
I/O storage nodes are configured, the administrator powers up any site-specific utility nodes.
The administrator executes the rpower command working with the following login node group:
$ rpower login on
$ rpower login stat (verify that the login node state is successful)
The administrator might want to execute other commands to the utility login nodes to ensure
that the application environment is set up.
All critical parts of the Power 775 cluster infrastructure are operational. All of the frames,
CECs, and disk enclosures also are powered up and running.

5.2.2 Shutdown procedures

This section describes shutting down the xCAT HPC system Power 775 hardware and
software with verification steps as the system is shut down.
See 5.2.1, "Startup procedures" on page 272 to review the overview and dependencies
sections because the sections describe the general hardware roles and interdependencies
that affect the start and shut down of the cluster.
The examples in this publication are for an AIX environment. All commands assume root
access on the EMS. Everything that is described in this publication is supported only in xCAT
2.6.6 and greater. Furthermore, this procedure is intended only as a post-installation
procedure.
For more information about the Power 775 related software, see these websites:
https://www.ibm.com/developerworks/wikis/display/hpccentral/IBM+HPC+Clustering+wi
th+Power+775+Overview
https://www.ibm.com/developerworks/wikis/display/hpccentral/IBM+HPC+Clustering+wi
th+Power+775+-+Cluster+Guide
Terminology
The terminology for this section is shared with the terminology section in 5.2.1, "Startup
procedures" on page 272.
Cluster shutdown assumptions
This section describes the assumptions that are made about the state of the cluster before
the cluster is shut down.
Shutting down an HPC cluster is a task that requires planning and preparation. Care must be
taken to inform users that this cluster shutdown operation is occurring. Removing user access
to the cluster and stopping the jobs in the LoadLeveler queue are critical first steps in shutting
down the cluster.
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IBM Power Systems 775 for AIX and Linux HPC Solution