Hello,
Looking at taht i'd say you're VERY badly CPU bound. a simple dd/cp doesn't do anything to the mail but IMAP ops will require some CPU work....Cyrus also will probably be forcing syncs but your I/O load doesn't look that high (my mfe's run more I/O and they're not storing any mail, just logs and temporary files for virus/spam scanning heh, and they only have a little IDE HDD each)
I found the option berkeley_cachesize which is way too low by default. Transactions just reading or writing db-entries (i.e. changes of flags) are much faster now.
Indead, the imapsync processes are causing much load: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20461 root 25 0 79988 36m 2488 R 63 3.6 13:24.10 imapsync 20925 root 25 0 14908 8196 2664 R 57 0.8 0:31.49 imapsync But what does them make so cpu-expensive?
I'd guess you're being CPU bound
What would you do if you would need to migrate from Maildir to cyrus? It is not important for me to keep the flags. I would be happy if I could move all message files to the appropriate cyrus folder. But will cyrus detect them automatically? Or is there any rebuild-command required?
Regards Marten ---- 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
