Salutations,
We are seeing slow mailbox creation times and are wondering how
unusual this might be for our configuration. Presently it takes about
4 wall-clock seconds to create a mailbox.
The machine running cyrus is a Sun V880 with 6 CPU's, around 8gigs
free RAM, and has 120k mailboxes (mailboxes.db is skiplist). It sees
2,000 concurrent imap connections, about 10 sustained imap logins per
second, and about 200,000 lmtp delivery operations per day.
The metadata (/var/cyrus/imap) is mounted with UFS logging on a Sun
Enterprise T3 that presently does nothing but serve out the metadata.
This is where mailboxes.db lives.
This computer seems happy and fast in all respects, except for mailbox
creations (4 seconds) and deletions (about 2 seconds) and ACL updates
(2 seconds). A truss of an imapd that creates a mailbox and then
deletes it reveals 75 iterations of this:
stat("/var/cyrus/imap/mailboxes.db", 0xFFBED3D0) = 0
fcntl(5, F_SETLKW, 0xFFBED448) = 0
fcntl(5, F_SETLKW, 0xFFBEE870) = 0
fstat(5, 0xFFBEE998) = 0
Any ideas?
--
David Powicki Network Analyst OIT Network Services
Voice: 413.545.1605 Fax: 413.545.3203 University of Massachusetts
email: dpowicki at nic.umass.edu Amherst, MA 01003-4640