The Disk Utilization Detail section of the Resource interval report displays detailed disk information for the selected time intervals.
Information is shown for each disk arm that is configured on the system. Consistent disk arm utilization at or above the threshold value affects system performance and causes longer response times or less throughput.
Note: 
A plus (+) sign displays next to the Unit column to
identify multipath disk units. 
A plus (+) sign displays next to the Unit column to
identify multipath disk units. Example
Resource Interval Report 10/03/03 15:24:49
Disk Utilization Detail Page 3
Multipath disk data
Member . . . : Q119115948 Model/Serial . : 840/10-3A6HM
Main storage . . : 1024.0 GB Started . . . : 04/29/03 11:59:48
Library . . : MPLIB System name . . : ABSYSTEM
Version/Release . : 5/3.0 Stopped . . . : 04/30/03 00:00:00
Partition ID : 001 Feature Code . : 23FE-2420-1546
IOP Name/ ASP Rsc ASP Itv --------- I/O Per Second --------- K Per Dsk CPU Queue Avg Time Per I/O
Unit (Model) Name Id End Total Reads Writes I/O Util Util Length Service Wait
---- ----------------- ---------- --- ----- ---------- --------- --------- ------- ------- ----- ------- ------- -----
+ 0004 CMB08 (2105) 5 12:15 .000 .000 .000 .0 11.4 .0 .00 .0000 .0000
12:15 .000 .000 .000 .0 9.0 .0 .00 .0000 .0000
12:15 .000 .000 .000 .0 21.0 .0 .00 .0000 .0000
12:30 .000 .000 .000 .0 6.7 .0 .00 .0000 .0000
12:30 .000 .000 .000 .0 6.7 .0 .00 .0000 .0000
12:30 .000 .000 .000 .0 6.7 .0 .00 .0000 .0000
12:45 .000 .000 .000 .0 9.0 .0 .00 .0000 .0000
12:45 .000 .000 .000 .0 9.0 .0 .00 .0000 .0000
12:45 .000 .000 .000 .0 6.6 .1 .00 .0000 .0000
13:00 .000 .000 .000 .0 16.2 .0 .00 .0000 .0000
13:00 .000 .000 .000 .0 13.8 .0 .00 .0000 .0000
13:00 .000 .000 .000 .0 9.0 .1 .00 .0000 .0000
13:15 .000 .000 .000 .0 11.4 .0 .00 .0000 .0000
13:15 .000 .000 .000 .0 9.0 .0 .00 .0000 .0000
13:15 .000 .000 .000 .0 6.6 .0 .00 .0000 .0000
13:30 .000 .000 .000 .0 9.2 .0 .00 .0000 .0000
13:30 .000 .000 .000 .0 6.8 .0 .00 .0000 .0000
Unit -- Disk arm identifier
IOP Name/ -- Input/Output processor resource name and
(Model) model number of the attached device
ASP Rsc Name -- ASP resource name to which the disk unit was
allocated at collection time
ASP ID -- Auxiliary storage pool number
Itv End -- Interval end time (hour and minute)
I/O /Sec -- Average number of I/O operations per second
Reads Per Second -- Average number of reads per second
Writes Per Sec -- Average number of writes per second
K Per I/O -- Average number of kilobytes (1024) per I/O operation
Dsk CPU Util -- Percentage of Disk CPU Utilization
Util -- Average percent of time disk was used (busy)
Queue Length -- Average length of waiting queue
Average Service Time -- Average disk service time per I/O operation
Average Wait Time -- Average disk wait time per I/O operation
+ Multipath disk unit.