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 scdpm command. Use this command to monitor, unmonitor, or display the status of disk paths in your cluster. This command is also useful for printing the list of faulted disks and monitoring disk paths from a file.

The second method for monitoring disk paths in your cluster is provided by the SunPlex Manager graphical user interface (GUI). SunPlex 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 SunPlex Manager GUI in conjunction with the scdpm(1M) command to administer disk paths. Refer to “Administering Sun Cluster With the Graphical User Interfaces” in Sun Cluster System Administration Guide for Solaris OS for information about SunPlex Manager.

Using the scdpm Command to Monitor Disk Paths

The scdpm(1M) command provides DPM administration commands that enable you to perform the following tasks:

Issue the scdpm(1M) command with the disk-path argument from any active node to perform DPM administration tasks on the cluster. The disk-path argument is always constituted of a node name and a disk name. The node name is not required and defaults to all if none is specified. The following table describes naming conventions for the disk path.


Note –

Use of the global disk-path name is strongly recommended, because the global disk-path name is consistent throughout the cluster. The UNIX disk-path name is not consistent throughout the cluster. The UNIX disk path for one disk can differ from cluster node to cluster node. The disk path could be c1t0d0 on one node and c2t0d0 on another node. If you use UNIX disk-path names, use the scdidadm -L command to map the UNIX disk-path name to the global disk-path name before issuing DPM commands. See the scdidadm(1M) man page.


Table 3–3 Sample Disk-Path Names

Name Type 

Sample Disk Path Name 

Description 

Global disk path  

schost-1:/dev/did/dsk/d1

Disk path d1 on the schost-1 node

all:d1

Disk path d1 on all nodes in the cluster

UNIX disk path  

schost-1:/dev/rdsk/c0t0d0s0

Disk path c0t0d0s0 on the schost-1 node

schost-1:all

All disk paths on the schost-1 node

All disk paths 

all:all

All disk paths on all nodes of the cluster 

Using SunPlex Manager to Monitor Disk Paths

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

Refer to the SunPlex Manager online help for procedural information about how to perform disk-path administration by using SunPlex Manager.