[cvs] [Wiki] changed: DeploymentColorado

[Jan Schneider]

jan  Thu, 15 Apr 2004 09:40:49 -0700

Modified page: https://dev.horde.org/horde/wicked/display.php?page=DeploymentColorado
New Revision:  1.1

@@ -1 +1,52 @@
+<code>From:     Daniel Wyss
+To:       imp at lists.horde.org
+Subject:  RE: [imp] Help Req. : Sizing a Horde\IMP system for 12,000 users
 
+Speaking from experience combining Sun hardware/Cluster/and Imp/Horde:
+I would first separate out your web server(s) from your mail and DB
+server(s) especially if you plan on using a secure web server and/or
+IMAPS. For this web server, use your best hardware, you may experience
+high loads like we did using SSL, so you may also consider purchasing
+crypto-cards if you run into this problem. The next (big) step would be
+to run a scalable apache server (via Sun Cluster 3.0). This starts
+getting pretty expensive, cost of licensing Sun Cluster 3.0 software,
+the cost of agents, the cost of the approved architecture, and the cost
+of support. Plus you definitely want to get some training if you're
+going to run a Sun Cluster. (personally I wouldn't recommend this route
+unless you really need HA and/or scalability.) I think option 2 from
+Eric's message down below might be the sensible route in your situation.
+
+
+
+
+Background:
+We have been running Imp/Horde here at the University of Colorado since
+the Summer of 2000 exclusively on Sun hardware. We initially opened it
+up to existing students as an alternative option to pine/elm or
+imaping/popping. The existing students had the choice to migrate over
+from an older mail server to this WebMail system, and all new incoming
+students were giving an account to this newer system. That first Fall
+semester we started with 5000 user accounts, and today there are 40k. We
+started off with (1)E3500 with 6 336MHz processors 2Gb of memory which
+served as the mail (IMAP only) and mysql backend. The Front-end web
+server was also a E3500 with 6 400MHz processors and 3 Gb of memory.
+When we hit about 30k user accounts we started experiencing high load on
+both servers. Granted, we do add some load with some in-house tweeks to
+the IMP/Horde software for quota and affiliation check, as well as doing
+secure IMAPS and SSL. We ended up with a soon to be 6 node V480 Sun
+Cluster 3.0 system that is running scalable apache serving the front-end
+(running IMP/Horde). For the backend, I ended up writing an agent for
+both mysql and uw-imap and this is in a 2 node cluster running (2) V880
+(one with 6 ultra-sparc-III 750MHz chips and the other with 8, one has
+12 GB and the other has 16GB of memory). It's a screaming system now. I
+have had my hands in this since the beginning, so if you want some more
+info about what we are doing here and what we have learned, feel free to
+contact me.
+
+******************************************
+Daniel Wyss
+IT PRO, Central and Unix Services
+Information Technology Services
+University of Colorado, Boulder             
+3645 Marine St, CB 455
+Boulder, CO 80309-0455</code>