On Nov 8, 2007 4:56 PM, Dan White <dwhite@xxxxxxx> wrote: > Michael D. Sofka wrote: > > On Thursday 04 October 2007 07:32:52 pm Rob Mueller wrote: > >> 4. Lots of other little things > >> > >> a) putting the proc dir on tmpfs is a good idea > >> b) make sure you have the right filesystem (on linux, reiserfs is much > >> better than ext3 even with ext3s dir hashing) and journaling modes > > > > On a Murder front-end server, could the tls_sessions.db be put on a > > tmpfs? What about mailboxes.db, since the murder master would have > > the master copy anyway. (This would slowdown startup in the case > > of the system loosing power. But, ``the front end servers can be > > considered 'dataless' '' according to: http://cyrusimap.web.cmu.edu/ag.html) > > > > We have a Murder Aggregate with two front-end and three back-end > > servers, and the master. I've noticed the front-end servers are a little > > IO bound. They each have a single disk, and I discovered that half > > of the IO wait went away when I buffered the cyrus.log file in syslogd. > > But, they still show an average of 5-6% IO Wait for processes. > > > > Moving imap/proc to tmpfs, however, had a negligible effect. > > > > I'll spec a two-disk system when new front-end's are ordered, > > but that would only split system from cyrus. Would it make more > > sense (and, more importantly, would it work and not foobar us) to order > > a machine with more memory, and put configdirectory: on tmpfs? (With > > the possible exception of the db snapshots and mboxlist backups.) > > > > Mike > > > > Hi Mike, > > While reviewing this thread for optimization ideas, I came across > your comment about buffering the cyrus.log in syslogd. Could you > explain what you did to configure that? Syslogd flush every write to disk You can ask syslog to omit syncing file by prefixing the name of your file by "-". Look the man page for more. Regards > > Thanks, > - Dan White > BTC Broadband > > ---- > 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 > -- Alain Spineux aspineux gmail com May the sources be with you ---- 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
