--On October 19, 2006 8:10:13 PM +0200 Marten Lehmann <lehmann@xxxxxx> wrote:
Hello, I'm about to migrate several thousand mailboxes from Maildir to Cyrus using the tool imapsync. It does its job very well and when I tested the migration on a small development server it was very fast. But now on the production system the synchronisation is very slow with a maximum of one message per second (and we have gigabytes of messages in the storage, partically > 10,000 messages per mailbox!). The general load of the system isn't very high, maybe a load average of 30. I disabled the duplicate message suppression. The mailboxes.db is about 8 megabytes big with approx. 13,000 mailboxes and 4 default folders each (Drafts, Junk, Sent, Trash).
Uhm... LA of 30 is very high. What OS? I assume Linux, vmstat 5 will tell you where you're hitting the wall, but unless you've got an 8 CPU machine LA 30 is rather quite high. Linux LA is a measurement of processes blocked on I/O, processes running and processes waiting to run on a CPU.
-- "Genius might be described as a supreme capacity for getting its possessors into trouble of all kinds." -- Samuel Butler ---- 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
