Wednesday, December 2, 2009

MustGather: Performance, hang, or high CPU issues on AIX

If you are experiencing performance degradation, hang, no response, hung threads, CPU starvation, high CPU utilization, network delays, or deadlocks, this MustGather will assist you in collecting the critical data that is needed to troubleshoot your issue.

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Monitoring performance with Tivoli Performance Viewer (TPV)

Tivoli Performance Viewer (TPV) enables administrators and programmers to monitor the overall health of WebSphere Application Server from within the administrative console.
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High availability manager

WebSphere Application Server includes a high availability manager component. The services that the high availability manager provides are only available to WebSphere Application Server components.
A high availability manager provides several features that allow other WebSphere Application Server components to make themselves highly available. A high availability manager provides:

* A framework that allows singleton services to make themselves highly available. Examples of singleton services that use this framework include the transaction managers for cluster members, and the default IBM® messaging provider, also known as the service integration bus.
* A mechanism that allows servers to easily exchange state data. This mechanism is commonly referred to as the bulletin board.
* A specialized framework for high speed and reliable messaging between processes. This framework is used by the data replication service when WebSphere Application Server is configured for memory-to-memory replication.

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Configuring the hang detection policy

The hang detection option for WebSphere Application Server is turned on by default. You can configure a hang detection policy to accommodate your applications and environment so that potential hangs can be reported, providing earlier detection of failing servers. When a hung thread is detected, WebSphere Application Server notifies you so that you can troubleshoot the problem.

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IBM HTTP Server Performance Tuning

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Tuning Web servers

Tuning IBM HTTP Server to maximize the number of client connections to WebSphere Application Server

DMZ - Demilitarized Zone

In computer networking, DMZ is a firewall configuration for securing local area networks (LANs).

In a DMZ configuration, most computers on the LAN run behind a firewall connected to a public network like the Internet. One or more computers also run outside the firewall, in the DMZ. Those computers on the outside intercept traffic and broker requests for the rest of the LAN, adding an extra layer of protection for computers behind the firewall.

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Advantage of IBM HTTP Server Over Dfault Http Transport In Websphere App Server 6.1

1. IBM HTTP Server is a full function HTTP server that using WAS plugin can
efficiently load balance traffic to one or more application servers in a
cluster. It is a critical component of high availability architecture. It
also allows one to deploy static content on web servers and reduce load from
application servers.

2. From security point of view, you can deploy HTTP servers in the DMZ thus
keeping application servers behind firewalls.

3. Default port HTTP is 80. On many operating systems you have to be root
(administrator) to be able to bind to this port. In case of application
server you will have to run the application server as root. This is not
always desirable as you do not want application code running with root