Обсуждение: Re: Hardware/OS recommendations for large databases (

Luke Lonergan wrote:
> Alan,
>
> On 11/18/05 6:46 AM, "Alan Stange" <stange@rentec.com> wrote:
>
>     That's 3 hours under load, with 80 compute clients beating on the
>     database at the same time. We have the stats turned way up, so the
>     analyze tends to read a big chunk of the tables a second time as
>     well. We typically don't have three hours a day of idle time.
>
>
> So I guess you’re saying you don’t know what your I/O rate is?
No, I'm say *you* don't know what my IO rate is.

I told you in my initial post that I was observing numbers in excess of
what you claiming, but you seemed to think I didn't know how to measure
an IO rate.

I should note too that our system uses about 20% of a single cpu when
performing a table scan at >100MB/s of IO. I think you claimed the
system would be cpu bound at this low IO rate.

Cheers,

-- Alan