Revert to a Previous CPU/Memory Configuration

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Use this procedure to revert a compute node to a previous CPU/Memory configuration. You must perform this procedure on each member in a cluster; the tool does not automatically propagate changes to every cluster member.

Caution - All members in a cluster must use the same CPU/memory configuration or the SPARC SuperCluster T4-4 may become unstable.

List previous configurations.
You can also view previous configurations in the log files at this location:

/opt/oracle.supercluster/setcoremem/log
```
$ ssh root@hostname-app1
Password:
Last login: Mon Jul 11 1:53:50 2012
Oracle Corporation      SunOS 5.11      11.0    May 2012
# ldm list-confg
factory-default
layout6
layout6_ML10182012142558
layout6_ML10182012162049
layout6_ML10182012165059
layout6_ML10182012201150 [current]
```
In this example, layout6 is the configuration initially installed. The remaining configurations are customer-created and can be identified by the naming format; ML stands for Modified Layout and the number string represents the local date and time that the configuration was created (MMDDYYYYHHMISS). So layout6_ML10182012201150 is a customer-modified layout created on October 18, 2012 at 8:11:50 pm.

Revert to a previous configuration.
```
# ldm set-config layout6
```

Halt all domains, then halt the primary domain.

Restart the system from the service processor.

# #.
 
-> cd /SP
-> stop /SYS
Are you sure you want to stop /SYS (y/n) ? y
Stopping /SYS
 
-> start /SYS
Are you sure you want to start /SYS (y/n) ? y
Starting /SYS

Boot all domains and zones.

Revert to a Previous CPU/Memory Configuration

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