Re: Hardware/OS recommendations for large databases (

Vivek,

On 11/18/05 8:07 AM, "Vivek Khera" <vivek(at)khera(dot)org> wrote:

>
> On Nov 18, 2005, at 10:13 AM, Luke Lonergan wrote:
>
>> Still, there is a CPU limit here ­ this is not I/O bound, it is CPU limited
>> as evidenced by the sensitivity to readahead settings.   If the filesystem
>> could do 1GB/s, you wouldn¹t go any faster than 244MB/s.
>
> Yeah, and mysql would probably be faster on your trivial queries.  Try
> concurrent large joins and updates and see which system is faster.

That¹s what we do to make a living. And it¹s Oracle that a lot faster
because they implemented a much tighter, optimized I/O path to disk than
Postgres.

Since you asked, we bought the 5 systems as a cluster ­ and with Bizgres MPP
we get close to 400MB/s per machine on complex queries.

- Luke