Date: Fri, 20 Jan 2006 15:27:04 +1100
To: Max Waterman <davidmaxwaterman+kernel@fastmail.co.uk>
Cc: linux-kernel@vger.kernel.org, Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: io performance...
Message-ID: <20060120042704.GB12447@samad.com.au>
Mail-Followup-To: Max Waterman <davidmaxwaterman+kernel@fastmail.co.uk>,
	linux-kernel@vger.kernel.org, Alan Cox <alan@lxorguk.ukuu.org.uk>
References: <5vx8f-1Al-21@gated-at.bofh.it> <5wbRY-3cF-3@gated-at.bofh.it> <5wdKh-5wF-15@gated-at.bofh.it> <43CEF263.9060102@shaw.ca> <43CF90C6.8050505@fastmail.co.uk> <1137679698.8471.30.camel@localhost.localdomain> <43D0626A.2090802@fastmail.co.uk>
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On Fri, Jan 20, 2006 at 12:09:14PM +0800, Max Waterman wrote:
> Alan Cox wrote:
> >On Iau, 2006-01-19 at 21:14 +0800, Max Waterman wrote:
> >>So, if I have my raid controller set to use write-back, it *is* caching=
=20
> >>the writes, and so this *is* a bad thing, right?
> >
> >Depends on your raid controller. If it is battery backed it may well all
> >be fine.
>=20
> Eh? Why?
>=20
> I'm not sure what difference it makes if the controller is battery=20
> backed or not; if the drives are gone, then the card has nothing to=20
> write to...will it make the writes when the power comes back on?
some do
>=20
> Max.
> -
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>=20

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