3.5.1 Matrix Server Command Reference

Chapter 1: Matrix Server Commands 26

Set the timeout value

The default timeout period for PSD devices is 30 seconds. If you need to

modify this value for a particular PSD device, use the following command.

value is in milliseconds; however, the smallest unit is 10 milliseconds. A value

of zero disables timeouts.

# mxmpio timeout <value> [<psddev>]

Show number of transient errors

The mpiostat command lists the number of transient errors for each target

and shows the number of failovers and fatal errors for each device. Values

represent the number of respective events since the device was bound. If

devices have not been rebound since boot, then this represents the number of

events since boot.

Show load statistics

The mpioload command shows the load (number of pending I/Os, both total

and raw) 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.

The syntax is:

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

interval is the number of seconds between samplings. The default is one

second. count is the number of samples to make; the default is to sample

indefinitely.

Values for failovers and fatal errors represent the number of respective events

since the device was bound. Values for load are the instantaneous number of

I/Os queued at the time of the sample. Raw I/Os are counted as requests (calls

to read()/write()) while total (block layer) I/Os are per buffer_head structure

(i.e., call to make_request()).

Display general I/O statistics

The iostat command displays general I/O statistics for each device. Specific

targets of PSD devices are not monitored individually. The syntax is:

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