On Thu, Oct 04, 2007 at 03:33:58PM -0700, Vincent Fox wrote: > > > Xue, Jack C wrote: > > At Marshall University, We have 30K users (200M quota) on Cyrus. We use > > a Murder Aggregation Setup which consists of 2 frontend node, 2 backend > > nodes > Interesting, but this is approximately 15K users per backend. Which is > where we are now after 30K users per backend were crushed. I am much > more interested in exploring whether Cyrus hits some tipping point where > a single backend cannot handle more than X users. > > That is our hypothesis right now, that the application has certain limits > and if you go beyond a certain number of very active users on a > single backend bad things happen. We ran over 100,000 users on a single backend for over a year without problems, but then we had a RAID array failure (3 disks within a day) with 2Tb of data on a single RAID unit and we learned that users don't like it when it takes a week to rebuild their email server because you just can't push the data any faster than that. These new big drives take a LONG time to fill! We don't do big instances like that any more - they're just too unwieldy. Bron. ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
