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Establishing a Proxy Host

In order for GEMM to deploy additional compute and access hosts and perform monitoring, you must choose a host from the Sun Control Station as an N1GE Admin Host. This host must remain as an N1GE admin host as long as GEMM is in use. You may choose a system which will be a compute host as well or you may choose a system which will only be an access host. This choice is determined by factors such as:

  • Security concerns about a compute host having admin privileges --- this factor depends upon your established policy for using N1GE.

  • Concerns about monitoring being impacted by compute tasks --- by default the monitoring command runs once a minute on the chosen host, which probably will not have a large impact unless the host is running a very resource-intensive job.

  • Permanence - The host you choose must be one which you do not expect to take down ever during the course of running GEMM, otherwise monitoring and deployments will not work

    Once you have decided which host to make the admin host, then perform these steps:

    1. Set this host as the proxy host as previously described.

    2. On the master host, add this host to the list of admin hosts. You can add the host using the N1GE GUI or add it from the command line by using the N1GE qconf -ah command.

Deploying the Chosen Proxy Host as a Compute or Access

At this point, click the Install Host menu item, select the chosen proxy, and install it as a compute or access host. You must select only the chosen proxy host and no other host in this step. You must wait to deploy additional hosts until the proxy host has been successfully established.

Uninstalling Hosts

From the Grid Engine main page you have two uninstall choices. You can uninstall a particular host or hosts or you can uninstall everything.

ProcedureTo Uninstall Hosts

You can remove one or more compute hosts from the compute grid.

When you uninstall a compute host, the N1GE software is shut down and removed from the selected hosts. The N1GE master host is instructed to remove those compute hosts from the N1GE compute grid.


Note - Before you start the uninstall procedure, ensure that no jobs are running on the compute hosts that you want to uninstall. Any jobs that are currently running on these hosts will be terminated. If the jobs are marked as "re-runnable", they are automatically resubmitted to the N1GE compute grid for execution on another compute host(s). However, if they are marked as "not re-runnable," then they are not rescheduled and are not automatically executed elsewhere.


Steps
  1. Select Grid Engine > Uninstall Host.

    The selector appears, displaying the list of hosts currently in the compute grid; see Uninstalling Hosts.

  2. Click to highlight a host(s). You can also click Select All at the top to choose all hosts in the list.

  3. Click Uninstall Selected Nodes in the bottom right corner.

    The Uninstall Task Progress Dialog appears.

    Figure 1-29 Select Nodes to Uninstall Page

    task progress dialog

ProcedureTo Uninstall Everything

You can remove all components of the Grid Engine module from the master host and all compute hosts.

Before you uninstall everything, be aware that:

  • all jobs (both running and suspended) are killed

  • all pending jobs are lost

  • all configurations and all records of previously run jobs are lost.

To uninstall everything:

Steps
  1. Select Grid Engine > Uninstall Everything.

    A screen appears, explaining the Uninstall Everything feature.

    Figure 1-30 Uninstall Completely Dialog

  2. Click Uninstall Master Host and ALL Compute Hosts.

    The Task Progress dialog appears.

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