<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.2722" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2>Im trying to put up a high availability mail system with high performance who support up to 300 000 mailboxes using a linux cluster.</FONT></SPAN></DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2>I have looked around for open source cluster solution, but so far only found solution like SAN for shared filesystem with high performance.</FONT></SPAN></DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2>Any suggestion how to solve the issues using open source software?</FONT></SPAN></DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2></FONT></SPAN> </DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial size=2>The system should support <FONT face="Times New Roman" size=3> </FONT></FONT></SPAN></DIV> <DIV><SPAN class=668293614-22092005><FONT face=Arial><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Verdana"><FONT size=2>- Mailbox replication </FONT></SPAN></DIV> <DIV class=O1 v:shape="_x0000_s1026"> <DIV style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 477; mso-text-indent-alt: 298; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 67%; FONT-FAMILY: Verdana"><SPAN style="FONT-SIZE: 90%; LEFT: -5.68%; COLOR: #003362; POSITION: absolute; TOP: 0.1em; mso-special-format: bullet"><FONT size=2>•</FONT></SPAN></SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Verdana"><FONT size=2><SPAN class=668293614-22092005>- </SPAN>Mailbox synchronization </FONT></SPAN></DIV><SPAN style="FONT-SIZE: 67%; FONT-FAMILY: Verdana"> <DIV style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 477; mso-text-indent-alt: 298; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 90%; LEFT: -5.68%; COLOR: #003362; POSITION: absolute; TOP: 0.1em; mso-special-format: bullet"><FONT size=2>•</FONT></SPAN></SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Verdana"><FONT size=2><SPAN class=668293614-22092005>- Redundancy both in hardware and software</SPAN></FONT></SPAN></DIV> <DIV style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 477; mso-text-indent-alt: 298; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Verdana"><FONT size=2><SPAN class=668293614-22092005>- The system is to be build with low cost computers</SPAN></FONT></SPAN></DIV> <DIV style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 477; mso-text-indent-alt: 298; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Verdana"><FONT size=2><SPAN class=668293614-22092005>- One shared filesystem without external storage like SAN</SPAN></FONT></SPAN></DIV> <DIV style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 477; mso-text-indent-alt: 298; mso-char-wrap: 1; mso-kinsoku-overflow: 1"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: Verdana"><FONT size=2><SPAN class=668293614-22092005>- Scalable</SPAN></FONT></SPAN></DIV></DIV></FONT></SPAN> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV align=left><SPAN class=668293614-22092005><FONT face=Arial size=2>/Robert Olsson</FONT></SPAN></DIV></BODY></HTML>