Rob Mueller <robm@xxxxxxxxxxx> wrote: > >> About 30% of all I/O is to mailboxes.db, most of which is read. I >> haven't personally deployed a split-meta configuration, but I >> understand the meta files are similarly heavy I/O concentrators. > > That sounds odd. > > Given the size and "hotness" of mailboxes.db, and in most cases the size > of mailboxes.db compared to the memory your machine has, basically the > OS should end up caching the entire thing in memory. Solaris 10 does this in my case. Via dtrace you'll see that open() on the mailboxes.db and read-calls do not exceed microsecond ranges. mailboxes.db is not the problem here. It is entirely cached and rarely written (creating, deleting and moving a mailbox). Pascal ---- 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
