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<div><font face="Arial">Thanks Andrew,</font></div>
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<div><font face="Arial">Last question if you let me:</font></div>
<div><font face="Arial">What criteria is generally used for which maiolboxes will be created on what back end server ?</font></div>
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<div><font face="Arial">Thanks</font></div>
<div><font face="Arial">Diego</font></div>
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<div class="gmail_quote">On Mon, Mar 15, 2010 at 8:10 PM, Andrew Morgan <span dir="ltr"><<a href="mailto:morgan@orst.edu">morgan@orst.edu</a>></span> wrote:<br>
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<div class="im">On Mon, 15 Mar 2010, Diego Ventrice wrote:<br><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">John,<br><br>Few questions about murder if you dont mind.<br><br>Does the front end server act as a load balancer, and also are back end server replicated exact copies ?<br>
<br>How would it be to deploy HA with murder, on the front servers ?<br></blockquote><br></div>Frontend servers are proxy servers. They lookup the location of the user's mailbox and proxy incoming IMAP connections to the correct backend server.<br>
<br>Backend servers are not much different than a standalone, non-Murder, Cyrus server. Each backend server registers its list of mailboxes with the mupdate master server, which maintains a master list of the location of all mailboxes in the Murder cluster. The frontend servers read from the mupdate master to locate mailboxes.<br>
<br>Backend servers are not fault-tolerant or highly-available.<br><br>As far as I know, the only Cyrus method of achieving high availability is using Cyrus replication.<br><br> Andy<br></blockquote></div><br>