From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andras Korn Subject: Re: write-behind has no measurable effect? Date: Tue, 15 Feb 2011 00:03:22 +0100 Message-ID: <20110214230321.GH836@hellgate.intra.guy> References: <20110214213817.GG836@hellgate.intra.guy> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, Feb 14, 2011 at 02:56:37PM -0800, Doug Dumitru wrote: > Not to be too cute, but the man page for mdadm says that > --write-behind is only attempted on drives marked --write-mostly.=A0 = I > did not see a --write-mostly in your array create statement. Yeah, I abbreviated it as -W: > > mdadm --create /dev/md/ssdraid --force --assume-clean --level=3D1 \ > > --raid-devices=3D3 --bitmap=3Dinternal --bitmap-chunk=3D262144 \ > > /dev/sdo2 --write-behind=3D16383 -W /dev/sd[nm]2 > Also, are you trying to create a three-way-mirror or mirror the one A three-way mirror. --=20 Andras Korn Caesar si viveret, ad remum dareris. -- 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