Re: RAID Controller Caching and XFS

[Seth Mos <knuffie@xxxxxxxxx>]

At 23:49 5-6-2002 +0200, utz lehmann wrote:
> Hi
>
> Florin Andrei [florin@xxxxxxx] wrote:
> > On Wed, 2002-06-05 at 13:04, Thor Lancelot Simon wrote:
> > >
> > > More importantly, you don't *want* to use readahead because it will waste
> > > valuable cache space on the controller that could be used to cache small
> > > writes.
> >
> > How safe is it to enable caching for writes on the controller (if you
> > don't have a battery on it)?
> > I mean, i configured my Mylex with "Write Through" for data-safety
> > reasons, even though the other option ("Write Back") could offer
> > improved performance.
>
> It's not (really) safe, see
> http://oss.sgi.com/projects/xfs/mail_archive/200205/msg00510.html

He is talking about a add-in card with it's own battery backup. The mail 
you referenced is about a externel raid device without a battery backup.

Cheers

--
Seth
It might just be your lucky day, if you only knew.