h1. Java
You must have installed a Java Development Kit (JDK) on your operating system before before proceeding with a Petals ESB installation.
A Java Runtime Environment (JRE) is not suitable.
Sun/Oracle JDK for Java 1.6 is the only JDK supported (no specific version).
Notice that no JDK for Java 7 is supported.
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h1. Firewall Software Configuration
All the ports declared within the *topology.xml* file must be opened between Petals server instances.
In addition, JMX ports must be accessible for administrators machines.
Besides, Petals components may require to open more ports (example: the SOAP component).
h1. Petals ESB hardware requirements
Only x86 hardware and 64-bit derivatives of x86 hardware are supported with Petals ESB.
Server load depends primarily on the number of requests per second on the bus.
*Production use, light to medium server load :*
* Dual 2 GHz\+ CPU Xeon or equivalent
* 2 GB of RAM
* 1.000 Mbits/s network interface
* 500 MB of disk
*Production use, heavy load :*
* Quad 2GHz\+ CPU Xeon or equivalent
* 4 GB of RAM
* 1.000 to 10.000 Mbits/s network interface
* 500 MB of disk
Notice that in a distributed mode, Petals nodes perform a lot of exchanges with other nodes.
The network is therefore highly solicited.
Petals ESB requires few disk space, unless you use advanced logging to monitor flows.
In this case, you should have a disk partition dedicated to the logs.
Petals ESB does not require to back up any data.
If a node crashes, you can simply reinstall it over another machine (with the same network configuration).
However, to minimize the impact of a crash, one can use a RAID configuration. This solution avoids a full reinstallation.
Petals ESB runs over virtualized environments.
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