Sun Cluster Concepts Guide for Solaris OS

Monitoring Disk Paths

This section describes two methods for monitoring disk paths in your cluster. The first method is provided by the cldevice command. Use this command to monitor, unmonitor, or display the status of disk paths in your cluster. You can also use this command to print a list of faulted disks and to monitor disk paths from a file. See the cldevice(1CL) man page.

The second method for monitoring disk paths in your cluster is provided by the Sun Cluster Manager graphical user interface (GUI). Sun Cluster Manager provides a topological view of the monitored disk paths in your cluster. The view is updated every 10 minutes to provide information about the number of failed pings. Use the information that is provided by the Sun Cluster Manager GUI in conjunction with the cldevice command to administer disk paths. See Chapter 13, Administering Sun Cluster With the Graphical User Interfaces, in Sun Cluster System Administration Guide for Solaris OS for information about Sun Cluster Manager.

Using the cldevice Command to Monitor and Administer Disk Paths

The cldevice command enables you to perform the following tasks:

Issue the cldevice command with the disk path argument from any active node to perform DPM administration tasks on the cluster. The disk path argument consists of a node name and a disk name. The node name is not required. If you do not specify a node name, all nodes are affected by default. The following table describes naming conventions for the disk path.

Note –

Always specify a global disk path name rather than a UNIX disk path name because a global disk path name is consistent throughout a cluster. A UNIX disk path name is not. For example, the disk path name can be c1t0d0 on one node and c2t0d0 on another node. To determine a global disk path name for a device that is connected to a node, use the cldevice list command before issuing DPM commands. See the cldevice(1CL) man page.

Table 3–3 Sample Disk Path Names

Name Type 

Sample Disk Path Name 


Global disk path  


Disk path d1 on the schost-1 node



Disk path d1 on all nodes in the cluster

UNIX disk path  


Disk path c0t0d0s0 on the schost-1 node



All disk paths on the schost-1 node

All disk paths 


All disk paths on all nodes of the cluster 

Using Sun Cluster Manager to Monitor Disk Paths

Sun Cluster Manager enables you to perform the following basic DPM administration tasks:

The Sun Cluster Manager online help provides procedural information about how to administer disk paths

Using the clnode set Command to Manage Disk Path Failure

You use the clnode set command to enable and disable the automatic rebooting of a node when all monitored shared-disk paths fail. When you enable the reboot_on_path_failure property, the states of local-disk paths are not considered when determining if a node reboot is necessary. Only monitored shared disks are affected. You can also use Sun Cluster Manager to perform these tasks.