Title: Re: [PERFORM] Hardware/OS recommendations for large databases (

On 11/15/05 6:55 AM, "Michael Stone" <[EMAIL PROTECTED]> wrote:

On Tue, Nov 15, 2005 at 09:33:25AM -0500, Luke Lonergan wrote:
>write performance is now up to par with the best cards I believe.  We
>find that you still need to set Linux readahead to at least 8MB
>(blockdev --setra) to get maximum read performance on them, is that your

What on earth does that do to your seek performance?

We’re in decision support, as is our poster here, so seek isn’t the issue, it’s sustained sequential transfer rate that we need.  At 8MB, I’d not expect too much damage though – the default is 1.5MB.

- Luke

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