How to Boot a Cluster Node in Non-Cluster Mode

You can boot a node so that the node does not participate in the cluster membership, that is, in non-cluster mode. Non-cluster mode is useful when installing the cluster software or performing certain administrative procedures, such as patching a node.

1. Become superuser on the cluster node to be started in non-cluster mode.

2. Shut down the node by using the scswitch and shutdown commands.

   # scswitch -S -h node # shutdown -g0 -y -i0

3. Verify that the node is at the ok prompt.

4. Boot the node in non-cluster mode by using the boot(1M) command with the -x option.

   ok boot -x

   Messages appear on the node's console stating that the node is not part of the cluster.

Example--Booting a Cluster Node in Non-Cluster Mode

The following example shows the console output when shutting down node phys-schost-1 then restarting the node in non-cluster mode. The -g0 option sets the grace period to zero, -y provides an automatic yes response to the confirmation question, and -i0 invokes run level 0 (zero). Shutdown messages for this node appear on the consoles of other nodes in the cluster.

# scswitch -S -h phys-schost-1
# shutdown -g0 -y -i0
May 2 10:08:46 phys-schost-1 cl_runtime: 
WARNING: CMM monitoring disabled.
phys-schost-1# 
...
rg_name = schost-sa-1 ...
offline node = phys-schost-2 ...
num of node = 0 ...
phys-schost-1# 
INIT: New run level: 0
The system is coming down.  Please wait.
System services are now being stopped.
Print services stopped.
syslogd: going down on signal 15
...
The system is down.
syncing file systems... done
WARNING: node 1 is being shut down.
Program terminated

ok boot -x
...
Not booting as part of cluster
...
The system is ready.
phys-schost-1 console login:

Repairing a Full /var File System

Both Solaris and Sun Cluster software write error messages to the /var/adm/messages file, which over time can fill the /var file system. If a cluster node's /var file system fills up, Sun Cluster might not be able to restart on that node. Additionally, you might not be able to log in to the node.

How to Repair a Full /var File System

If a node reports a full /var file system and continues to run Sun Cluster services, use this procedure to clear the full file system. Refer to "Viewing System Messages" in System Administration Guide: Advanced Administration for more information.

1. Become superuser on the cluster node with the full /var file system.

2. Clear the full file system.

   For example, delete nonessential files that are contained in the file system.