GPA Manual

Description of GPA Reports
Guardian Performance Analyzer (GPA) Manual—135081
3-5
System Performance Summary
A later section of the report, titled Disk Volume Performance Analysis, gives detailed
performance data for each volume in the node.
Global Performance Indicators
In this subsection of the report (Example 3-3), GPA provides an overall evaluation of the
system’s performance based on the GPA analysis criteria. For the node in the example,
the GPA analysis has found the following conditions:
(12) CPU(s): The primary and backup CPUs for the volume.
(13) CACHE HIT%: Percentage of requests that were satisfied with data in cache.
(14) REQUEST RATE/SEC: Number of requests per second.
(15) % OF ALL CACHE CALL: Cache calls for the volume as a percentage of
calls for all volumes.
Example 3-3. Global Performance Indicators
III. GLOBAL PERFORMANCE INDICATORS
1
EXCESSIVE DISPATCHING : NO
2
INDEX LEVELS > 2 : NO
3
PROCESSOR LOAD BALANCE : POOR
4
OVER UTILIZED DISK : NO
5
OVER UTILIZED NODE : NO
6
CACHE FAULT DETECTED : NO
7
OVER UTILIZED CPU : NO
8
TRANSIENT PROCESSING : NO
9
DISK VOLUME QUEUING : YES
10
BLOCKED REQUESTS : NO
11
AVERAGE CACHE HIT % : 83.20%
12
TOTAL CACHE CALL RATE: 25.00 /SEC
(1) EXCESSIVE DISPATCHING: No excessive dispatching. A dispatch occurs
each time CPU cycles are allocated to a process. The acceptable value for this
parameter depends on the CPU type.
(2) INDEX LEVELS > 2: No index levels greater than 2. Each index level in a
key-sequenced file can cause an additional physical I/O operation and/or
additional CPU cycles. Keeping the number of index levels at a minimum (no
more than 2) reduces the number of physical I/O operations and/or CPU cycles
required for each logical I/O operation on the file.
(3) PROCESSOR LOAD BALANCE: Poor processor load balance. Referring to
Example 3-1
shows that the node has two CPUs that are out of balance.
(4) OVER UTILIZED DISK: No overutilized disk process. None of the
percentage busy times for the disk processes on the node is excessive.
(5) OVER UTILIZED NODE: No overutilization of the node. The percentage
utilization of the node is below the maximum recommended level (refer to
Example 3-1
).