"Also sprach Matthew Wakeling:" > >> Has anyone done some benchmarks between hardware RAID vs Linux MD software > >> RAID? ... > > The upshot is I don't really see a difference in performance. > > The main difference is that you can get hardware RAID with > battery-backed-up cache, which means small writes will be much quicker > than software RAID. Postgres does a lot of small writes under some use
It doesn't "mean" that, I'm afraid. You can put the log/bitmap wherever you want in software raid, including on a battery-backed local ram disk if you feel so inclined. So there is no intrinsic advantage to be gained there at all. > However, not all hardware RAID will have such a battery-backed-up cache, > and those that do tend to have a hefty price tag. Whereas software raid and a firewire-attached log device does not. Peter -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
