Maximo installation System Requirements

Hardware (distributed topology)

Distributed deployment hardware prerequisites: This table contains hardware information for IBM middleware components. If you deploy the product using non-IBM middleware components, see the documentation provided with the product. 
 Administrative workstation:

• 2-4GHz processor (minimum)
• 4 GB RAM (minimum)
• 10 Mbit/s network connection between administrative workstation and middleware servers (minimum)
• 11 GB disk space

You must have a minimum of 11 GB disk space available for a fresh installation. Ensure 7 GB of disk space is available if you are performing an upgrade.

An additional 6 GB of disk space must be available in the TEMP directory of the administrative workstation during the installation.

Consider future process managers you might install when determining your disk space needs.

IBM DB2 (alternative database can be used):

•  Minimum 20 GB disk space.

 IBM WebSphere Application Server Network Deployment (alternative J2EE server can be used):

• 2-6 GHz processor
• 40 GB disk space
• 6 GB RAM

Oracle WebLogic Server(alternative J2EE server can be used): 

• 2-6 GHz processor
• 40 GB disk space
• 6 GB RAM

IBM Tivoli Directory Server (optional component):

Linux®and UNIX® systems require 1 GB of space available in the /opt directory.

Please check out the Below Link for further details

http://www.ibm.com/developerworks/wikis/display/maximo/System+Requirements+for+Version+7.5+Maximo+Products