GPA Manual for G-series RVUs

Guardian Performance Analyzer (GPA) Manual – (544977-001) Page 65 of 106
Example 4-6. Global Performance Indicators for \NODEC
III. GLOBAL PERFORMANCE INDICATORS
EXCESSIVE DISPATCHING : NO INDEX LEVELS > 2 : NO
PROCESSOR LOAD BALANCE : POOR OVER UTILIZED DISK : NO
OVER UTILIZED NODE : NO CACHE FAULT DETECTED : NO
OVER UTILIZED CPU : NO TRANSIENT PROCESSING : NO
DISK VOLUME QUEUING : NO BLOCKED REQUESTS : NO
AVERAGE CACHE HIT % : 88.93% TOTAL CACHE CALL RATE: 461.00 /SEC
The Node Characteristics section and Global Performance Indicators can (in addition
to profiling the system’s health) point to the reasons for a system’s poor performance.
Disk Volume Subsystem Performance Score
You can get a further indication of where problems might lie from the Disk Volume
Performance subsection of the report (Example 4-7). This section shows the high- and
low-value extremes for a number of disk volume performance parameters and thus
makes it easy to see whether the disk volume subsystem may be presenting
difficulties. For a properly balanced system, the high and low values should be as
close together as possible.
In Example 4-7 you can see how unevenly the cache calls are distributed among the
disk volumes on this node. Ideally, that is, if the node were perfectly balanced, the nine
volumes in the system would each have about 11 percent of all cache calls.
Example 4-7. Disk Volume Performance for \NODEA
II. DISK VOLUME PERFORMANCE
VOLUME BUSY% REQUEST CPU CACHE REQUEST % OF ALL
QTIME (s) HIT% RATE/SEC CACHE CALLS
LOW BUSY DISK VOL : $X42 .0 0 2: 3 0.0% 0 0%
HI BUSY DISK VOL : $SYSTEM 18.9 25 0: 1 66.1% 12 57%
LOW Q-TIME VOL : $ClO 4.2 19 0: 1 90.2% 3 16%
HI Q-TIME VOL : $PROJEC .0 114 2: 3 99.7% 1 4%
*LOW BUSY DISK PROC: $B40 .1 0 0: 1 0.0% 0 0%
*HI BUSY DISK PROC: $SYSTEM 7.2 25 0: 1 66.1% 12 57%
*LOW CACHE PERF. : $XPRESS 1.7 51 2: 3 52.6% 0 4%
*HI CACHE PERF. : $NSMS 6.3 24 2: 3 99.9% 4 20%
(* relates to the disk process. request-qtime is expressed in Ms).
System Performance Score
In the System Performance Score subsection of the report (Examples 4-8 through
4-10), you can see which parts of the system are doing most poorly and, therefore,
have the greatest potential for improved performance through tuning. This section