3.5.1 Matrix Server Command Reference

Chapter 1: Matrix Server Commands 23

active <target> [<psddev> ...]

Set the active target on the specified device.

mpiostat [-l] [<psddev> ...]

List the number of transient errors for each target and show the number of

failovers and fatal errors for each device.

mpioload [-l] [interval [count]] [<psddev> ...]

Shows the load for each target (SCSI command I/Os) and total for the PSD

device (block layer I/Os), number of failovers, and fatal errors for each

device.

iostat [-u] [interval [count]] [<psddev> ...]

Show general I/O statistics for each device.

rawstat [interval [count]] [<psddev> ...]

Dump general I/O statistics for each device in a raw format.

Enable or disable failover for a server

A matrix server can use multiple FC ports to connect to the FibreChannel

fabric. If the FC port or FC switch currently being used for I/O should fail,

Matrix Server will by default fail over the I/O to another FC port/FC switch

path.

You can use the following command to control whether this failover behavior

can occur on a particular node. Run the command on the server where you

want to change the failover behavior. (Matrix Server starts with failover

enabled.)

# mxmpio enableall|disableall

Enable or disable failover for a PSD device

When a failure occurs in the I/O path to a particular PSD device, Matrix

Server will by default fail over to another I/O path. You can use the following

command to control whether this failover behavior can occur for specific PSD

devices. Matrix Server starts with failover enabled.

# mxmpio enable|disable [<psddev ...>]

Specify the Path for I/O

If you are troubleshooting problems with an I/O path, you may want to direct

the I/O to another I/O path. You might also want to manually balance I/O