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Anleitung HP, modell HP NonStop G-Series

Hersteller: HP
Dateigröße: 298.63 kb
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Anleitung Zusammenfassung


Using GPA Information
Disk Subprocess Analysis and Recommendations
Example 4-15. Cache Performance Analysis for \NODEB
CACHE PERFORMANCE ANALYSIS
LOGICAL | ALLOCATED CACHE | CACHE HIT RATES(%) | REQUEST RATES
VOLUME | 512 1024 2048 4096 | 512 1024 2048 4096 | CACHE BLOCK/SECOND
| BLKS BLKS BLKS BLKS | | 512 1024 2048 4096
| | |
$SYSTEM | 16 30 10 50 | 99 99 66 87 | .2 1.4 .4
$PRODl | 180 6 7 30 | 96 99 46 | 3.2
$PROD4 | 8 6 6 63 | 90 83 | 14.0
$PROD3 | 8 380 10 73 | 78 76 77 77 | .1 .2 9.4
$TEST3 | 8 6 6 6 | 98 93 | .2 1.9
$PROD5 | 8 6 6 25 | 93 90 91 96 | 1.7
$PROD2 | 8 6 6 6 | 89 97 | .2
$TESTl | 8 6 6 6 | |
$TEST2 | 8 6 6 6 | 95 |
In the example, you can see that volumes $PROD4 and $PROD3, with request rates of
14.0 and 9.7 per second for all cache blocks, account for most of the cache activity on
their respective primary processors, CPU 0 and CPU 2. The fact that the same two
volumes also exhibit poor cache performance, as indicated by the relatively low cache
hit rates for their blocks, shows that a reallocation of cache blocks would probably
improve the cache performance for the two volumes. The improved cache performance
should also bring down to acceptable levels the queue times for $PROD4 and $PROD3.
On the basis of its cache performance analysis, GPA makes recommendations for
resetting cache allocations to improve performance.
Disk Subprocess Analysis and Recommendations
GPA generates an analysis of the disk subprocesses like the one shown in Example 4-16.
This section of the standard report enables you to see the number of disk subprocesses
allocated to each logical disk volume and to analyze the activity in each. GPA makes
recommendations to add or remove subprocesses when it finds that they are either highly
active or inactive. Making actual changes to the number of disk subprocesses is done by
performing a new SYSGEN. Before making these changes, you should double-check
that the disk processing that occurred during the measurement period is typical for your
system. For example, you might confirm that GPA shows the same recommendations
over more than one 24-hour measurement period where the disk processing appears to
be typical.
The figure shows that all of the logical volumes in the system are configured with three
disk subprocesses (PINs) except $AUDIT, which has four. (The maximum that can be
configured is eight.) As you look at the figure, pay attention to the net change column.
This column shows the logical volumes for which GPA is making a recommended
change. In the case of $DATA, the net message rate on PIN#3 is quite high at over
3 messages/second. GPA therefore recommends that an additional PIN be allocated to
this logical volume. You can also see that $V80A2 has relatively low activity on its first
two PINs and no activity on its third. GPA recommends reconfiguring this logical
volume with one fewer PIN.
Guardian Performance Analyzer (GPA) Manual— 135081
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Dieses Handbuch ist für folgende Modelle:
PC Desktops - HP NonStop L-Series (298.63 kb)

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