From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roberto Spadim Subject: Re: support for external persistent cache Date: Wed, 19 Jan 2011 15:37:59 -0200 Message-ID: References: <4D365BE2.9020300@gmail.com> <20110119155211.GA31671@erebus.underworld.local> <20110119162941.GA32537@erebus.underworld.local> <20110119170252.GA891@erebus.underworld.local> <20110119172907.GA1342@erebus.underworld.local> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20110119172907.GA1342@erebus.underworld.local> Sender: linux-raid-owner@vger.kernel.org To: Cory Coager Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids please check my email =3D) let=B4s end this email? 2011/1/19 Cory Coager : > On Wed, Jan 19, 2011 at 03:15:40PM -0200, Roberto Spadim wrote: >> hummm.... >> thinking again..... >> >> what?s the today raid1 problem? >> it?s based on minimal disk size >> for example... >> /dev/sda 1gb >> /dev/sdb 1tb >> we can have a 1gb raid only >> >> what you want is: >> 1tb raid0 >> with a automatic /dev/sda to /dev/sdb write >> >> >> could we call this raid0-cache? >> i think we could implement it in raid.... >> >> check this fuse (filesystem) implementation: http://www.furquim.org/= chironfs/ >> it?s based on filesystem (ok it?s a raid1, not a cache like, but?s >> limited to max filesystem size, not the minimal filesystem size... o= k >> it?s not secure to use it since small filesystem don?t have all >> information, but?s nice) >> >> anyone want to make raid0-cache implementation? > > I have two comments on this. > > I don't think the cache device should be the same size as your > disk storage. =A0It should be a small cache size similar to > hardware RAID. > > Also, we'd need a way to flush the data from the cache device > on bootup. > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =A0http://vger.kernel.org/majordomo-info.html > --=20 Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html