Date: Tue, 12 Oct 2004 16:13:46 -0600 From: "Kenneth D. Merry" <ken@freebsd.org> To: Roisin Murphy <Roisin.Murphy@gmail.com> Cc: freebsd-hardware@freebsd.org Subject: Re: sata raid & write cache state Message-ID: <20041012221346.GA89589@nargothrond.kdm.org> In-Reply-To: <b21e6cca0410121510c110433@mail.gmail.com> References: <b21e6cca041010181932879aeb@mail.gmail.com> <20041011043508.GA72113@nargothrond.kdm.org> <b21e6cca041011090816a1352@mail.gmail.com> <20041011210303.GA78436@nargothrond.kdm.org> <b21e6cca04101117425d2908eb@mail.gmail.com> <20041012171106.GB86646@nargothrond.kdm.org> <b21e6cca0410121144420fe03b@mail.gmail.com> <20041012215951.GA89335@nargothrond.kdm.org> <b21e6cca0410121510c110433@mail.gmail.com>
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On Tue, Oct 12, 2004 at 15:10:38 -0700, Roisin Murphy wrote: > > Head to www.apc.com and look at the UPSes they have there. They're > > basically lead acid batteries with inverters to put out A/C power when your > > main power feed goes out. > > i meant the battery option they sell with some raid controllers, is > this and extra little PSU, that also powers the disks for a while, or > is this just meant to keep the raid controller's cache powered till > the machine boots up again, so it can finish its cache flush? It just powers the cache until the machine boots again and the controller can flush the cache out. Ken -- Kenneth Merry ken@FreeBSD.ORG
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