MPATH

The MPATH (MPA) service monitors I/O channel path activity.

This service also detects imbalances and possible path failures by monitoring the utilization of all, or a subset of, the channel paths installed in the system.

Syntax

The parameters are defined as follows:

Parameter	Description
chpid	channel path identifier
chpid1-chpid2	range of channel path identifiers; chpid1 is the lowest channel path identifier, and chpid2 is the highest channel path identifier
time	specifies the length of the sample period in seconds; the default sample period is 15 seconds

Note

If you do not specify chpid, the MPATH service monitors all channel paths attached to all processors.

Example 1

To display I/O activity for all channel paths, type

MPATH

                     [1]       [2]
AMTO21I CHANNEL PATH 0C WAS   4% BUSY
AMTO21I CHANNEL PATH 12 WAS   1% BUSY
AMTO21I CHANNEL PATH 13 WAS   1% BUSY
AMTO21I CHANNEL PATH 1B WAS 13% BUSY
AMTO21I CHANNEL PATH 1C WAS   7% BUSY
AMTO21I CHANNEL PATH 38 WAS 14% BUSY
AMTO21I CHANNEL PATH 39 WAS 19% BUSY
AMTO21I CHANNEL PATH 3C WAS 19% BUSY

Example 2

To display I/O activity for channel paths 12-14, type

MPATH 12-14

                     [1]        [2]
AMTO21I CHANNEL PATH 12 WAS   4% BUSY
AMTO21I CHANNEL PATH 13 WAS   3% BUSY
AMTO21I CHANNEL PATH 14 WAS   0% BUSY

Example 3

To display I/O activity for all channel paths over the past 60 seconds, type

MPA,60

                     [1]        [2]
AMTO21I CHANNEL PATH 0C WAS   4% BUSY
AMTO21I CHANNEL PATH 12 WAS   3% BUSY
AMTO21I CHANNEL PATH 13 WAS   3% BUSY
AMTO21I CHANNEL PATH 14 WAS   4% BUSY
AMTO21I CHANNEL PATH 1B WAS   5% BUSY
AMTO21I CHANNEL PATH 1C WAS   5% BUSY
AMTO21I CHANNEL PATH 1E WAS   4% BUSY
AMTO21I CHANNEL PATH 38 WAS   5% BUSY
AMTO21I CHANNEL PATH 39 WAS 11% BUSY
AMTO21I CHANNEL PATH 3C WAS 11% BUSY
AMTO21I CHANNEL PATH 3D WA    6% BUSY

Legend:

channel path identifier (CHPID)
percentage of time that the channel path was busy during the sample period