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<h1 class="topictitle1">Component Report - Disk Activity</h1>
<div><p>The Disk Activity section of the component report shows the average
disk activity per hour and the disk capacity for each disk.</p>
<p>The values that display in the report header reflect the configuration
metrics obtained from the QAPMCONF file when the collection started. These
values might change for each interval within a collection period due to dynamic
changes in logical partition configuration.</p>
<div class="note"><span class="notetitle">Note:</span> A plus sign (+) displays next to the Unit column to identify multipath
disk units. A multipath disk unit is a unit that has multiple redundant paths
from the system to the disk unit.</div>
<div class="example"><h4 class="sectiontitle">Example</h4><pre> Component Report 10/03/03 13:54:29
Disk Activity Page 1
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
Int Threshold . : 10.00 %
Virtual Processors: 4 Processor Units : 4.0
---------- Average Disk Activity Per Hour ----------- ------ Cache hit Statistics ----- %Write
Srv -------------- Disk Arm Seek Distance --------------- Device Controller Write EACS EACS Cache -Disk Capacity-
Unit Util Time 0 1/12 1/6 1/3 2/3 >2/3 Read Read Effic Read Resp Overruns MB Percent
---- ---- ----- -------- -------- -------- -------- -------- -------- ------ ---------- ----- ---- ---- -------- ------- -------
0001 .1 .0346 516 564 8 111 0 0 23.0 25.6 86.1 .0 .0 .0 5,164 60.1
0002 .0 .0000 67 397 43 76 0 0 30.9 63.4 80.8 .0 .0 .0 5,463 63.6
0003 .1 .0189 228 388 96 93 10 6 38.9 57.1 81.2 .0 .0 .0 5,463 63.6
+ 0004 .0 .0000 0 0 0 0 0 0 .0 .0 .0 .0 .0 .0 8,586 99.9
+ 0005 .0 .0000 0 0 0 0 0 0 .0 .0 .0 .0 .0 .0 8,586 99.9
+ Multipath disk unit
Column Total Average
--------------------------- ---------------- ----------------
Util .0
Srv Time .0000
Disk Arm Seek Distance
0 813
1/12 1,350
1/6 148
1/3 281
2/3 10
>2/3 6
Cache hit Statistics
Device Read 27.7
Controller Read 43.4
Write Efficiency 82.4
EACS Read .0
EACS Resp .0
%Write Cache Overruns .0
Disk Capacity
MB 67,606
Percent 87.4
Unit -- Disk arm identifier
Util -- Drive utilization
Srv Time -- Average service time per request in seconds
Disk Arm Seek Distance -- Average seek distance distributions per hour
0 -- Number of zero seeks
1/12 -- Number of seeks between 0 and 1/12 of the disk
1/6 -- Number of seeks between 1/12 and 1/6 of the disk
1/3 -- Number of seeks between 1/6 and 1/3 of the disk
2/3 -- Number of seeks between 1/3 and 2/3 of the disk
>2/3 -- Number of seeks greater than 2/3 of the disk
Cache hit Statistics --
Device Read -- Percent of device read hits for each arm
Controller Read -- Percent of controller cache read hits for each arm
Write Efficiency -- Percent of efficiency of write cache
EACS Read -- Extended Adaptive Cache Simulator percent read hits
EACS Resp -- Extended Adaptive Cache Simulator estimated percent response time improvement
%Write Cache Overruns -- Percent of Write Cache Overruns
Disk Capacity -- Average amount of disk space used or available
MB -- Millions of bytes available on the disk
Percent -- Percent of space available on the disk</pre>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahxreportperftools.htm" title="Performance Tools reports provide information on data that has been collected over time. Use these reports to get additional information about the performance and use of system resources.">Performance Tools reports</a></div>
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