Recovering Logical Domains from a Failed Server
This guide provides an end-to-end example for how to use Oracle Enterprise Manager Ops Center.
Oracle Enterprise Manager Ops Center provides options to install and configure Oracle VM Server for SPARC systems, create logical domains, and provision OS on the logical domains. You can pool the Oracle VM Server for SPARC systems in a server pool which provides load balancing, high availability capabilities, and sharing resources with all the members of the pool.
The high availability capability for an Oracle VM Server for SPARC server pool is enhanced by allowing the automatic recovery of the logical domains on a failed server.
In Oracle Enterprise Manager Ops Center, you can recover the logical domains from failed and unreachable Oracle VM Server for SPARC systems. You can enable automatic recovery for the logical domains and set the priority of recovery. The automatic recovery priority decides the order of recovery of the logical domains. Zero (0) is the lowest automatic recovery priority while 100 is the highest. When an Oracle VM Server Control Domain fails, the logical domains in it are recovered and started on another Control Domain in the server pool.
There are many scenarios and conditions that determine the recovery of the logical domains. In this example, two such scenarios are described:
Automatic recovery of logical domains
Manual recovery of logical domains
For more information, refer to Oracle Enterprise Manager Ops Center Feature Reference Guide.
In this example, the Control Domain is placed in a server pool and has logical domains running in it. When the Control Domain becomes unreachable, the logical domains that have been enabled for automatic recovery are recovered and started in another Control Domain in the server pool automatically. When the logical domains are not enabled for automatic recovery, the logical domains can be recovered from the failed Control Domain using the manual procedure described in this guide.
You will need the following for showcasing the recovery of the logical domains:
Two Oracle VM Server for SPARC servers installed and configured using Oracle Enterprise Manager Ops Center.
The Oracle VM Server for SPARC servers are placed in a server pool.
Two logical domains installed and configured on one of the Oracle VM Server for SPARC system using Oracle Enterprise Manager Ops Center.
The Oracle VM Server for SPARCs are of the following configuration:
In this example, the servers named as smt4-14 and smt4-15 are installed and configured with Oracle VM Server for SPARC 2.2 using Oracle Enterprise Manager Ops Center.
The Control Domains are placed in a server pool with the following policies:
Place guest in Oracle VM Server with lowest relative load.
Do not automatically balance the server pool.
Power off a failed server from Service Processor, given capabilities, before automatic recovery of attached logical domains.
Two logical domains, guest1 and guest2 are created in the Control Domain smt4-15.
In this example, the following two scenarios are described:
There are two logical domains guest1 and guest2 in this example. The logical domain guest1 is designed for manual recovery and the logical domain guest2 for an automatic recovery. The Control Domain smt4-15 in which the logical domains resides becomes unreachable. Select a topic to see how the recovery procedures are executed:
To recover the logical domains automatically, you must enable the automatic recovery of the logical domains. You can enable the automatic recovery of logical domains in the following ways:
Set the automatic recovery option when you create the logical domain profile. Select the automatic recovery and the provide the priority value in the logical domain profile.
Select the logical domain and use the option Enable Automatic Recovery in the Actions pane to trigger the recovery of logical domains automatically when a server fails. Edit the Automatic Recovery Priority using the Edit Attributes option for a logical domain. The Enable Automatic Recovery is shown in the figure below.
In this example, the logical domain guest2 is enabled for an automatic recovery with an Automatic Recovery Priority of 100, which is the highest priority for recovery.
When an Oracle VM Server for SPARC in the server pool fails, the logical domains that have been enabled for automatic recovery are recovered and started on another Oracle VM Server in the server pool without any user intervention.
When the Control Domain smt4-15 fails and becomes unreachable, the automatic recovery of the logical domain guest2 is triggered. The status of smt4-15 is unreachable as shown in the figure below.
You can view the job running in the job pane.
Select the job and view the job details such as the task flow execution.
From the job details, you can view that the server smt4-15 is powered off according to the server pool policy. The logical domain guest2 recovery is initiated and created successfully on the Control Domain smt4-14 in the server pool. When the logical domain guest2 is recovered, the server pool status is as in the following figure:
You can view the logical domain guest2 recovered and running on the Control Domain smt4-14. The Control Domain smt4-15 is in unreachable status and the logical domain guest1 has disappeared from the list.
When the logical domain is recovered on the other host in the server pool, Oracle Enterprise Manager Ops Center takes care to auto boot the operating system of the logical domain. Allow some time for the logical domain to get started on the new virtualization host as its operating system gets booted.
When the failed server is repaired and restarted, the logical domains that were not recovered are started in the Control Domain. For the logical domains that are recovered and running on other servers, Oracle Enterprise Manager Ops Center cleans up the repaired server and removes those logical domains.
In a scenario where you cannot repair the failed server, you must manually recover the logical domains.
When you have not enabled automatic discovery of logical domains or you do not have enough resources to recover the logical domains in a server pool, then use the manual procedure to recover the logical domains.
When the Control Domain smt4-15 becomes unreachable, do not try to remove it from the server pool using the option Remove from Server Pool. You cannot remove a Control Domain with running guests from a server pool.
As described in the previous section, the logical domain guest1 was not enabled for automatic recovery. Use the following procedure to manually recover the logical domain.
The Control Domain is unreachable and the server is already powered off according to the server pool policy. Else, power off the Control Domain.
Select All Assets in the System Group filter in the Navigation pane.
Select Managed Assets tab in the center pane.
Select the unreachable Control Domain from the list. Ensure that you select the Control Domain and not the operating system of the Control Domain.
Click the Delete Assets icon to delete the asset.
Click Delete to confirm the delete action.
The Unmanage Asset wizard is displayed.
Oracle Enterprise Manager Ops Center requires the credentials to delete the Agent Controller installed on the asset. Though the asset is unreachable, you must provide the credentials to continue the wizard. Select the credential and then click Next.
Click Finish to unmanage the asset.
The delete asset job is carried out, and the service processor and the Control Domain disappear from the assets tree. Select the server pool in which the Control Domain was originally placed. The logical domain guest1 appears in the server pool under the Shutdown Guests list. You can start the logical domain in the required virtualization host in the server pool.
From the figure, you can see that the logical domain guest2 which was enabled for automatic recovery was recovered and running in another Control Domain in the server pool. The logical domain guest1 is also recovered and available as shut down guest in the server pool.
Use the option Start Guest to start the shut down logical domain on an Oracle VM Server in the server pool.
The Oracle Enterprise Manager Ops Center 12c documentation is located at
See the following guides for more information:
Oracle Enterprise Manager Ops Center Feature Reference Guide for information about logical domains and server pools.
Oracle Enterprise Manager Ops Center Administration Guide for information about user roles and permissions.
Other examples are available at
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Oracle Enterprise Manager Ops Center How to Recover Logical Domains from a Failed Server, Release 22.214.171.124.0
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