| To: | Florin Andrei <florin@xxxxxxx> |
|---|---|
| Subject: | Re: RAID Controller Caching and XFS |
| From: | utz lehmann <xfs@xxxxxxxxxx> |
| Date: | Wed, 5 Jun 2002 23:49:13 +0200 |
| Cc: | linux-xfs <linux-xfs@xxxxxxxxxxx> |
| In-reply-to: | <1023314217.32329.32.camel@stantz.corp.sgi.com> |
| References: | <auto-000021147946@dc-mx04.cluster1.charter.net> <4.3.2.7.2.20020603111517.03b4e1b0@pop.xs4all.nl> <20020605160422.A14886@pla-muek.reefedge.com> <1023314217.32329.32.camel@stantz.corp.sgi.com> |
| Sender: | owner-linux-xfs@xxxxxxxxxxx |
| User-agent: | Mutt/1.2.5i |
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
utz
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