HP NonStop G-Series - Manual (Page 145)

Balancing and Tuning a System
Measure User’s Guide — 520560-003
7 -9
Correcting Outstanding Problems
server processes, you lose any chance of parallel processing and create an
unmanageable sequence of queues.
•
Transient activity (process creations and deletions, and file opens and closes) is
kept to a minimum.
If an application has few of these attributes, it is difficult to spread its workload across
the system. You might have to balance the system around the application.
Pathway processes, the PATHMON-managed TCPs, and servers that make up a
Pathway application can have all the listed features. A well-designed Pathway
application is easy to tune.
Correcting Outstanding Problems
Check the system console and any error logs your site uses to locate problems in the
system or bugs in the applications. Correct these before attempting to make other
changes. Resolving a major problem in hardware or software can change the
performance of the system, so eliminate these problems before proceeding.
Measuring the System
Take a measurement that gives a comprehensive picture of the system and its major
applications. If possible, measure the system for a full day or more to make sure peak
periods are measured. Using this data, you can find the busiest hour of the day. This
peak hour is most critical for system tuning. For the longer term, it is also important to
learn about peak periods during a week and at the end of the month.
To create this comprehensive picture of the system, HP recommends this
measurement:
2+ ADD CPU *
3+ ADD DISC *
4+ ADD DEVICE *
5+ ADD LINE *
6+ ADD NETLINE *
7+ ADD CLUSTER *
8+ ADD SYSTEM *
9+ ADD PROCESS *
10+ ADD CONTROLLER *
11+ ADD DISCOPEN application data files
12+ ADD FILE application data files
13+ START MEASUREMENT file, INTERVAL 30 MIN
This example is valid for both D-series and G-series RVUs. Although the
CONTROLLER entity type is replaced by SERVERNET in G-series PVUs, the
command ADD CONTROLLER * is accepted in G-series PVUs as equivalent to ADD
SERVERNET *. Either command measures all ServerNet addressable controllers
(SACs). To measure specific SACs, you must use the ADD SERVERNET command
and specify the SACs to measure.