On Sun, Sep 11, 2011 at 3:59 PM, Igor Chudov <ichudov@gmail.com> wrote:
> Well, right now, my server has twelve 7,200 RPM 2TB hard drives in a RAID-6
> configuration.
> They are managed by a 3WARE 9750 RAID CARD.
>
> I would say that I am not very concerned with linear relationship of read
> speed to disk speed. If that stuff is somewhat slow, it is OK with me.
With Raid 6 you'll have abysmal performance on write operations.
In data warehousing, there's lots of writes to temporary files, for
sorting and stuff like that.
You should either migrate to raid 10, or set up a separate array for
temporary files, perhaps raid 0.