> I suppose that 8 SATA disks for the data and four 15k SAS disks for the > metadata would be a good mix. Yes. As I mentioned, our iostat data shows that meta-data is MUCH hotter than email spool data. --- Checking iostat, a rough estimate shows meta data get 2 x the rkB/s and 3 x the wkB/s vs the email spool, even though it's 1/20th the data size and we have the status cache patch! Basically the meta data is "very hot", so optimising access to it is important. --- Splitting was definitely a big win for us. Rob ---- 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
