On Sun, Sep 11, 2011 at 4:21 PM, Igor Chudov <ichu...@gmail.com> wrote: > Quantitatively, what would you say is the write speed difference between > RAID 10 and RAID 6?
https://support.nstein.com/blog/archives/73 There you can see a comparison with 4 drives, and raid 10 is twice as fast. Since raid 5/6 doesn't scale write performance at all (it performs as a single drive), it's quite expected. 12 drives would probably be around 6 times as fast as raid 6. You definitely should do some benchmarks to confirm, though. And Andy is right, you'll have a lot less space. If raid 10 doesn't give you enough room, just leave two spare drives for a raid 0 temporary partition. That will be at least twice as fast as doing temporary tables on the raid 6. You'll obviously have to get creative, tons of options. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
