GPA Manual

Using GPA Information
Guardian Performance Analyzer (GPA) Manual—135081
4-33
Disk Cache Performance Score Grading
Disk Cache Performance Score Grading
The Cache Hit Rate of each disk on the node is a positive contributing factor to the disk
cache performance score. The final score of the disk cache subsystem is the average
cache hit rate of all volumes. Example 4-38
is a detailed report displaying the disk cache
subsystem score grading.
Negative Contributing Factors to Disk Volume Score
This subsection of the score report clarifies the subsection Disk Volume Subsystem
Performance Score of the System Performance Summary. The disk volume subsystem
score is based on the performance and queue time of all disks. Example 4-39 is a
detailed report displaying the disk volume subsystem score.
Example 4-38. Disk Cache Performance Score Grading
DETAIL Disk Cache Performance Score Grading
Disk name Grading
--------- -------
$PROD1 + 25
$PROD2 + 71
$PROD3 + 76
$PROD4 + 81
$PROD5 + 92
$PROD6 + 85
$PROD7 + 91
$PROD8 + 93
$SYSTEM + 50
$TEST1 + 81
$TEST2 + 78
--------- -------
Disk Cache Score: 823 / 11 = 75%
Notes on Disk Cache Performance Score: Good = 90% thru 100%
Fair = 75% thru 89%
Poor = 2% thru 74%
Example 4-39. Negative Contributing Factors to Disk Volume Score (page 1 of 2)
DETAIL Negative Contributing Factors to Disk Volume Score
1 2 3 4 5 6 7 8
Disk name Blockd Hiproc Indexd Memory Overbs Pcache Queued R:C <1 Grading
--------- ------ ------ ------ ------ ------ ------ ------ ------ -------
$PROD3 X X X X X X - 7%
$PROD4 X X X X X - 32%
$PROD5 X X X - 3%
$PROD6 X X X X X - 5%
$PROD7 X X X X - 5%
$PROD8 X X X - 10%
$SYSTEM X X X X - 8%
$TEST2 X X X X - 2%
$TEST3 X X X X - 5%
--------- ------ ------ ------ ------ ------ ------ ------ ------- -------
Disk Score: 23%