WebSphere Application Server V7.0: Concepts ... - IBM Redbooks

Table 7-1 Planning checklist for Web applications
Planning item
Establish performance goals and identify workload characteristics (throughput,
response time, availability).
Design your topology to meet the performance goals. Determine if clustering will be
used.
Determine if the appropriate mechanisms are in place for workload management and
failover. As part of this, you need to consider where applications will be deployed (8.12,
“Mapping application to application servers” on page 307).
Implement a monitoring system to watch for performance problems and to assist in
determining if adjustments are necessary.
Monitor the following as potential physical bottleneck areas:
► Network load balancers
► Firewalls
► Application servers
► Database servers
► LTPA providers
Examine initial settings for performance tuning parameters and adjust if necessary.
Reevaluate these periodically:
► JVM heap maximum and minimum sizes
► Web container
– Thread pool
– Maximum persistent requests
– Timeout values
► EJB container
– Inactive pool cleanup interval
– Cache size
► Database connection pool
– Maximum connections
– Unused timeout
– Purge policy
► Database servers
– Maximum database agents
– Maximum connected applications
– Query heap size
– Sort heap size
– Buffer pool size
– Database memory heap
– Application control heap
– Lock timeout
► Directory services
– Database tuning
– Authentication cache intervals
Chapter 7. Performance, scalability, and high availability 277