LARGE single-system Cyrus installs?
robm at fastmail.fm
Sat Oct 6 05:30:18 EDT 2007
> 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.
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