TPDC Manual (G06.24+)

Using the SPAM Performance Data Charts and
Reports
Tandem Performance Data Collector (TPDC) Manual—526357-001
5-11
Disc Cache Performance (DCPCHRT)
The cache performance counters are updated in the Measure DISC entity by the disk
process in the following order:
•
Cache read: hits, misses
•
Cache write: clean, dirty hits, misses
This chart uses the DGLOBAL and DISCINFO entities.
Parameters used are:
•
LID—specifies the Measure Load ID
•
EXCLUDE—specifies a value under which to exclude the number of requests per
second
•
SECTION—specifies the report section number
The chart is sorted in descending order of cache hits and misses and volume name.
Disc Cache Performance Chart for System \CSO (Release D20)
----------------------------
Cache Cache
Rqsts (H+M) Miss <---Cache Miss Percentage [Average = 5.5%]-->
$Volume /scnd /scnd %-age 0 10 20 30 40 50 60 70 80 90
-------- ----- ===== ----- +----+----+----+----+----+----+----+----+----+
$USERS 5.6 7.7 3.5 |** |
$SYSTEM 4.5 5.7 4.4 |** |
$LAB 1.4 3.4 .4 | |
$JACK2 2.4 2.8 4.5 |** |
$JACK 1.8 2.3 7.2 |**** |
$GPATS2 1.5 1.7 6.9 |*** |
$DATA 1.3 1.6 7.3 |**** |
$TOOLS 1.2 1.5 2.9 |* |
$TUOMO 1.1 1.3 9.1 |***** |
$GPATS1 1.1 1.3 10.3 |***** |
$IMAGE 1.1 1.1 5.1 |*** |
$WORK .9 1.0 7.3 |**** |
$TUBDV1 .8 1.0 8.6 |**** |
$DATA1 .7 .8 8.4 |**** |
$DATA2 .7 .8 8.8 |**** |
$DATA3 .6 .7 8.4 |**** |
$DATA4 .6 .6 8.7 |**** |
$GPADV1 .5 .6 8.4 |**** |
$MWR3 .5 .5 8.1 |**** |
$TUBTS1 .5 .5 8.5 |**** |
$MWR2 .4 .5 7.4 |**** |
$GIAO2 .3 .4 19.5 |********** |
$GPADV2 .3 .4 10.2 |***** |
$AUDIT .3 .3 7.9 |**** |
$MWR1 .3 .3 7.4 |**** |
+----+----+----+----+----+----+----+----+----+
0 10 20 30 40 50 60 70 80 90
NOTE: An exclamation point (!) following the 'Cache (H+M)' column
indicates more than three Cache accesses per request. This
may indicate a more-than-desirable number of index levels
in a key-sequenced file or table.