HP NonStop G-Series - Manual (Page 138)

Balancing and Tuning a System
Measure User’s Guide — 520560-003
7 -2
Balancing a System
Balancing a System
Balancing a system starts when you configure the system hardware. You should
distribute disks, terminals, and other devices evenly across all CPUs. Balancing lets
you distribute the primary I/O processes for those devices (especially disk processes)
across all CPUs. The eventual goal is to distribute workload, so consider which I/O
processes carry the heaviest loads and try to keep them on different CPUs.
When you bring up the system, start the Measure subsystem and a system
measurement. Use data from this measurement to check the load on each CPU and
the balance of the workload across all resources. It can help you identify trends as your
workload and your resource needs change. It can also help you identify trends in
system activity, such as when the system is heavily or lightly used, the resources that
are most heavily or most lightly used, and so on.
Because multiple measurements can run concurrently, the system measurement can
continuously collect performance data for use in performance analyses and capacity
planning without seriously affecting any other measurements that are configured.
Adding these commands to the system start-up file automatically starts the Measure
subsystem and a continuously running system measurement each time you start the
system. This configuration is effective for an initial evaluation of system performance.
MEASCOM
MEASSUBSYS
ADD CPU *
ADD PROCESS *
ADD DISC *
ADD DEVICES *
ADD LINE *
ADD NETLINE *
ADD CLUSTER *
ADD SYSTEM *
START MEASUREMENT datafile, INTERVAL 30 MIN
After running this measurement for 24 hours, check the size of the measurement data
file. If it is growing too rapidly, modify the measurement configuration and run it again.