efficiency drops when user exceed 5000+?

Rob Siemborski rjs3 at andrew.cmu.edu
Wed Jun 9 13:46:56 EDT 2004

On Wed, 9 Jun 2004, Zhang Weiwu wrote:

> Hello. I have cyrus imapd runing now on my server. Today I heard people say 
> when the user number exceed 5000+ the cyrus proformance drops in the way that 
> unless many partitions ware made (what partition? file system partition?) to 
> share the load. I'm pretty newbie on mail server administration, should I 
> start to do something in case my user number grow over 5000+? I'm running a 
> dual-processor Xeon server with IDE soft RAID10 discs.

By number of users, do you mean concurrent sessions or number of inboxes?

I don't know of anything that will cause cyrus performance to suddenly 
bottom out after 5000 inboxes -- especially if you are using fulldirhash.

The number of users you can support on an individual machine is mostly 
related to its memory and (especially) I/O capacity, and the number of 
*concurrent* users, not the number of inboxes.


Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456
Research Systems Programmer * /usr/contributed Gatekeeper

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