OSI/MHS Configuration and Management Manual

Sizing and Tuning Your OSI/MHS Subsystem
OSI/MHS Configuration and Management Manual—424827-003
8-2
Performance Tuning Steps
Large Numbers of Retries
The link and route-retry mechanisms of OSI/MHS ensure that OSI/MHS will retry
connections on different addresses and through different adjacent MTAs if you set up
your configuration accordingly. If the STATUS ENTRY command shows consistently
large numbers of retries, or if the applications that produce messages receive frequent
nondelivery reports, you can tune a variety of attributes (discussed in Tuning OSI/MHS
Attributes on page 8-13) to improve fault tolerance or to accommodate the throughput
characteristics of remote MTAs.
Connection Rejections
Connection rejections are associated with the number of retries and can account for
delays in the delivery of messages. The STATS PROCESS RTS command lets you
monitor connection rejections involving adjacent MTAs. The STATS PROCESS RS
command lets you monitor rejections from remote user agents. The STATS PROCESS
LO command lets you monitor rejections from local user agents.
Consistently Large Internal Queues
The STATS PROCESS MRP command displays the size of OSI/MHS internal queues.
Long queues do not necessarily indicate a problem: they occur naturally when a large
number of messages, or messages destined for many recipients, arrive at once.
However if long queues exist when performance problems have already been noted,
that information can help you or a HP analyst to identify the problem.
Performance Tuning Steps
The following steps are recommended for tuning an OSI/MHS subsystem:
1. Review your network topology and application characteristics.
2. Check the sizing and distribution of system and subsystem components.
3. Define O/R names to optimize routing.
4. Tune OSI/MHS and supporting software.
5. Monitor system and subsystem performance.
6. Return to step 1 if necessary.
The rest of this section describes each step.
Review Network Topology and Application
Characteristics
The following aspects of network topology and application characteristics are of special
importance to the performance of your message handling system. The exact