GPA Manual
Description of GPA Reports
Guardian Performance Analyzer (GPA) Manual—135081
3-12
Disk Volume Performance Analysis
The report (Example 3-8) provides the same items of information as the previous report
(Example 3-7) does except that three new items replaced two old items because these
two old items (unit number and controller number) are obsolete on operating system
G02 and later.
The three new items provide the following information:
(6) AVG DEVICE BUSY%: The percentage of time the volume is busy,
averaged for mirror devices.
(7) PROCESS BUSY%: The percentage busy time for the disk I/O processes
associated with the volume.
(8) REQUEST RATE/SECOND: The number of requests per second.
(9) CACHE HIT: The percentage of cache calls that are satisfied without a
physical I/O.
(10) CACHE CALLS PER REQUEST: The average number of cache calls used
to satisfy a request. An asterisk (*) after this value indicates that greater than
3.1 cache calls per request occurred on the particular volume. This is
considered excessive by GPA and should be investigated.
Example 3-8. Disk Volume Performance Analysis: ServerNet Systems
DISK VOLUME PERFORMANCE ANALYSIS
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VOLUME CPUS GRP MOD SLT REQUEST AVG PROCESS REQUEST CACHE CACHE
NAME NUM NUM NUM QUEUE DEVICE BUSY% RATE HIT CALLS PER
PC:BC TIME BUSY% /SECOND RATE% REQUEST
------- ----- --- --- --- ------- ----- ------- ------- ----- ---------
$SYSTEM 0: 1 1 1 15 25.11 18.91 7.25 12.12 66.1 1.0
$NSMS 2: 3 2 1 15 24.26 0.00 6.36 4.03 99.9 1.2
$PROJEC 2: 3 2 1 7 114.23 0.00 5.63 1.06 99.7 1.2
$DRIVER 0: 1 3 4 11 26.49 1.93 0.88 1.09 90.7 0.9
$XPRESS 2: 3 4 1 15 51.38 0.00 1.72 0.00 52.6 1.3
$MEAS 2: 3 4 1 3 56.45 0.00 0.54 0.00 0.0 2.6
$G02 0: 1 3 1 11 0.00 0.41 0.19 0.00 0.0 4.0
$X42 2: 3 1 1 12 0.00 0.00 0.50 0.00 0.0 6.0
(3) GRP NUM: The group number of the physical location address.
(4) MOD NUM: The module number of the physical location address.
(5) SLT NUM: The slot number of the physical location address.