=== One is glad to be of service === I've been taking care of big iron since my first job as an EmployedWorker and in the '90s I've been providing free, but commercial quality, telecommunication service to a total of 450 registered users with my own BullettinBoardSystem called SystemShockBbs. I've been using many different OSes, see SystemArchitectRole for a list. === Production systems === I've designed and helped implementing the following production systems, all of which are still in service: * '''DevelerCompany's IT infrastructure''' - Leveraging my earlier work for SiriusCompany, for over 6 years I've been continuously growing and restructuring the network, the servers and their intricate mesh of services and support scripts. The main server, called {{trinity}}, contains 1TB of storage and offers file storage, user authentication, e-mail, and many web-based services to a highly heterogeneous and complex environment comprising several versions of Linux, MacOsX and Windows clients. Another server, called {{asterisk}}, acts as a VoIP PBX and secondary slave for many (but not all) of {{trinity}}'s services. * '''http://www.fieremostre.it/''' - A cluster of 4 RedHat servers, two web frontends and Java appservers and two database and filesystem backends with hw SCSI RAID5. Fully managed remotely, including power fencing and robotized tape juggler. * I've configured and installed a cluster of 5 nodes on blade CPU boards with shared fiber-channel RAID storage. I used a pre-release of RedHat's Advanced Server product to implement a shared storage pool of 1.5TB with GFS1. The system initially went to production without the GFS pool because of reliability concerns with this new technlogy. * '''Genexpress Lab''' - A combo of two servers, each acting as a gateway and file server for a security ring. This design was done for the Department of Bioengineering of the University of Firenze, in Prato's Scientific Center. My philosophy is using mainstream hardware whenever possible and concentrate most services on few phisical systems. The savings in cost can be used to increase availability and performance through redundancy. This strategy leads to datacenters that are easy to understand and maintain, while at the same time scaling up much better than traditional asymmetrical solutions (like web server, mail server, db server...). Being fond of UNIX culture, I tend to keep my systems as open as possible and at the same time very secure. TODO: add a list of server software I use/know