On 18/03/2008, Peter Koczan <pjkoczan@xxxxxxxxx> wrote: > available, and RAID 5 and RAID 6 are just huge pains and terribly slow > for writes. RAID 5 and RAID 6 are just huge pains and terribly slow for writes with small numbers of spindles.... ;} In my testing I found that once you hit 10 spindles in a RAID5 the differences between it and a RAID10 started to become negligible (around 6% slower on writes average with 10 runs of bonnie++ on 10 spindles) while the read speed (if you're doing similar amounts of reads & writes it's a fair criterion) were in about the 10% region faster. With 24 spindles I couldn't see any difference at all. Those were 73GB 15K SCAs, btw, and the SAN connected via 2GB fibre. > Peter Cheers, Andrej -- Please don't top post, and don't use HTML e-Mail :} Make your quotes concise. http://www.american.edu/econ/notes/htmlmail.htm -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
