Cache performance analysis, Back to toc – HP Integrity NonStop J-Series User Manual
Page 59
Guardian Performance Analyzer (GPA) User Guide
– (544541-006) Page 59 of 131
(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.
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.
Example 3-8. Disk Volume Performance Analysis: ServerNet Systems
DISK VOLUME PERFORMANCE ANALYSIS
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
The three new items provide the following information:
(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.