Re: RAID 5+1 and BAARF

On 10/30/06, Niall Litchfield <niall.litchfield_at_gmail.com> wrote:
>
>
> Mitigated, yes, but not eliminated. At some point the cache will be
> exhausted, and then performance will hit the floor. Bear in mind that you
> will likely have Oracle and filesystem cache's involved as well so the
> caching algorithm of the hardware will have to be one that doesn't cache
> blocks held in the other two cache's - clever stuff hey, ask how the SAN
> does it. You'll also need the SAN to guarantee that all writes to CACHE will
> never be lost, does it?
>

As you have implied, saturating the cache is not too difficult.

As for cache writes never being lost: what good is the guarantee when the cache writes *are* lost? Been there, done that, wasn't much fun.

-- 
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist

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