Re: raid10 hard disk choice

On Thu, 21 May 2009, Linos wrote:
>     i have to buy a new server and in the budget i have (small) i have to
> select one of this two options:
>
> -4 sas 146gb 15k rpm raid10.
> -8 sas 146gb 10k rpm raid10.

It depends what you are doing. I think in most situations, the second
option is better, but there may be a few situations where the reverse is
true.

Basically, the first option will only be faster if you are doing lots of
seeking (small requests) in a single thread. As soon as you go
multi-threaded or are looking at sequential scans, you're better off with
more discs.

Matthew

--
 Experience is what allows you to recognise a mistake the second time you
 make it.