From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roy Sigurd Karlsbakk Subject: Re: recommended way to add ssd cache to mdraid array Date: Sat, 12 Jan 2013 13:06:19 +0100 (CET) Message-ID: <2258826.8.1357992379424.JavaMail.root@zimbra> References: <6FD79D70-01A4-4DC9-9494-157773CD0F11@colorremedies.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <6FD79D70-01A4-4DC9-9494-157773CD0F11@colorremedies.com> Sender: linux-raid-owner@vger.kernel.org To: Chris Murphy Cc: linux-raid Raid List-Id: linux-raid.ids > Unlikely to make up the difference is the scheduler. Parallel fs's > like XFS don't perform nearly as well with CFQ, so you should have a > kernel parameter elevator=3Dnoop. uh=E2=80=A6 how can the filesystem chosen be relevant to the disk eleva= tor? CFQ will try to optimize access to reduce seeks and should be comp= letely independent on the filesystem used on top. Also, if you really w= ant to disable CFQ (which you shouldn't do on rotating rust, IMO), bett= er use deadline (which is default on newer kernels). Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@karlsbakk.net http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt.= Det er et element=C3=A6rt imperativ for alle pedagoger =C3=A5 unng=C3=A5= eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilf= eller eksisterer adekvate og relevante synonymer p=C3=A5 norsk. -- 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