Re: imap server performance benchmarks Bill Campbell Fri Mar 09 12:01:06 2012
On Fri, Mar 09, 2012, Da Rock wrote: > I'm reconsidering my current setup (postfix/courier) for imap and I was > doing some research on performance comparisons between imap server > setups. I stumbled on this article just just about fell of my chair > laughing when I read the last article on future benchmarking tests to > perform: > > research.microsoft.com/pubs/138302/lisa.pdf > > Considering I have close to a hundred folders or more, and an average of > 50,000 emails in each (yes, not good, and I am working on archiving but > it won't help _that_ much) with nearly 200,000 in just one! I got a real > kick out of the comment that "no sane email user would have more than > 21,000 emails in a folder" - that would make me certifiable :D Oh, and > that most email wouldn't be more than a GB or so... mine's edging 6GB > already... My security folder averages about 19,000 messages, containing all security reports for the last 30 days (it's a bit over 22,000 today). > So, all jokes aside, I contemplated that I would make an ideal test case > to the extreme for benchmarking imap servers. Anyone have any > suggestions on what to test/how? Anyone have some tools they have > created for a similar challenge? I have my own ideas, but if anyone > wants me to try something I'd be willing to give it a shot. We have been using courier-imap for at least a decade including at several regional ISPs with 10,000 accounts or so. This has worked very well with minimal problems. During this time we have had to move all e-mail accounts to new servers, and this has been pretty simple. Set up the accounts and $HOME directories on the new machine. Change the DNS to point to it. Then copy all the data from the old box to the new using rsync. This would take a couple of hours with 10,000 accounts. During this time all new mail was processed and available immediately while older messages weren't until the rsync jobs were complete. When we first started building systems for ISPs in 1994, we were using the University of Washington IMAP server, and had a variety of problems as systems grew. Its monolithic file storage required special handling, and I learned about inetd limits on handling large numbers of incoming connections the hard way. I much prefer the Maildir stores as they allow use of standard *nix utilities, find, grep, etc., are hard to corrupt, and have no locking problems with NFS mounts. The courier method of having multiple authentication processes has held up very well over the years under heavy usage. Bill -- INTERNET: [EMAIL PROTECTED] Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way Voice: (206) 236-1676 Mercer Island, WA 98040-0820 Fax: (206) 232-9186 Skype: jwccsllc (206) 855-5792 Now if there is one thing that we do worse than any other nation, it is try and manage somebody else's affairs. Will Rogers _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
- imap server performance benchmarks Da Rock 2012/03/08
- Re: imap server performance benchmarks Jerome Herman 2012/03/08
- Re: imap server performance benchmarks Daniel Staal 2012/03/08
- Re: imap server performance benchmarks Bill Campbell 2012/03/09 <=