You can. It's called Hercules. It runs under Linux and emulates a S/370 or ESA/390 mainframe. Although not quite Open Source (and definitely not GPL), it's free "...for your own personal non-commercial educational and hobby use". You can use it run OS/360, MVT and other old stuff which is public domain. See Jay Maynard's page for instructions on how. You can just about run Linux/390 under Hercules:-)
The talk was "The Design and Implementation of a Large Scalable Mail Server". It's about the mail cluster I set up here for Oxford University and it sounds similar to what the original request was for. We have about 30000 users. I successfully argued against MS Exchange and designed and built a completely Open Source solution based on a Linux cluster with 250GB of disk, UW imapd/ipopd, Exim (MTA) and an Apache/mod_perl-based web to mail gateway that I wrote called WING. The two Solaris nodes in the cluster were there for political reasons and are being replaced by Linux boxes within the next few weeks. There is a WING web page and mailing list which includes a link to the PostScript slides of the talk. The slides will also be shortly be available from UKUUG.
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You can. It's called Hercules. It runs under Linux and emulates a S/370 or ESA/390 mainframe. Although not quite Open Source (and definitely not GPL), it's free "...for your own personal non-commercial educational and hobby use". You can use it run OS/360, MVT and other old stuff which is public domain. See Jay Maynard's page for instructions on how. You can just about run Linux/390 under Hercules :-)
The talk was "The Design and Implementation of a Large Scalable Mail Server". It's about the mail cluster I set up here for Oxford University and it sounds similar to what the original request was for. We have about 30000 users. I successfully argued against MS Exchange and designed and built a completely Open Source solution based on a Linux cluster with 250GB of disk, UW imapd/ipopd, Exim (MTA) and an Apache/mod_perl-based web to mail gateway that I wrote called WING. The two Solaris nodes in the cluster were there for political reasons and are being replaced by Linux boxes within the next few weeks. There is a WING web page and mailing list which includes a link to the PostScript slides of the talk. The slides will also be shortly be available from UKUUG.