Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

Preparing the Host System 3–9
iostat
You can use the iostat utility to view performance statistics on MA6000 storage units. (Set
your terminal screen to 132 columns before running iostat.)
The output from iostat shows the number of devices (LUNs) that have been defined in the
configuration file. It is much easier to interpret the output if the configuration file contains
entries for all eight devices. If the configuration file does not contain entries for all
devices, the iostat output has fewer columns and it is difficult to correlate each column
with a specific device.
For V4.0G
# iostat rznn s t
The output from iostat shows all devices that have device name rznn. The information for
LUN 0 is in the first column, the information for LUN 1 is in the second column, and so
forth.
# iostat rz16 5 4
rza16 rzb16 rzc16 rzd16 rze16 rzf16 rzg16 rzh16
bps tps bps tps bps tps bps tps bps tps bps tps bps tps bps tps
0 0 0 0 0 0 0 0 0 0 0 0 0 0 126 3
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1618 34
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1639 34
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1610 34
The above display shows activity on all 8 LUNs attached to one SCSI-bus (2), one Target
0. The above list represents information on rza16, rzb16... rzh16. The device with activity
is device rzh16.
The iostat utility only recognizes device names in the format rznn where nn is calculated
as:
(8 * Host SCSI Bus #) + (HSG60 Target ID)
(This is the same formula and format that is used for the configuration file.)
Invoke the iostat utility using the following format:
For V5.1x
iostat dsk3 s t