Re: 10K vs 15k rpm for analytics

Francisco Reyes wrote:
>
> Going with a 3Ware SAS controller.
>
>
> Have some external enclosures with 16 15Krpm drives. They are older
> 15K rpms, but they should be good enough.
> Since the 15K rpms usually have better Transanctions per second I will
> put WAL and indexes in the external enclosure.

It sounds like you have a lot of hardware around - my guess it would be
worthwhile to do a test setup with one server hooked up with two 3ware
controllers. Also, I am not sure if it is wise to put the WAL on the
same logical disk as the indexes, but that is maybe for a different
thread (unwise to mix random and sequential io and also the wal has
demands when it comes to write cache).

regards,
Yeb Havinga