From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roy Sigurd Karlsbakk Subject: Re: Checksumming RAID? Date: Wed, 28 Nov 2012 11:56:28 +0100 (CET) Message-ID: <23882377.7.1354100188235.JavaMail.root@zimbra> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Chris Murphy Cc: Linux Raid List-Id: linux-raid.ids > > According to a few studies I've read, the number of silent errors > > are identical on both consumer SATA drives and SAS drives. It's the > > density that makes errors, and the platters and disk heads are > > produced alike. >=20 > That's not what I'm reading: >=20 > Corruption detected in 8.5% of nearline disks, and 1.9% in enterprise > disks. > http://www.pdsi-scidac.org/events/PDSW09/resources/pdsw09_slides13.pd= f That doesn't make sense. Nearline and enterprise drives are large 7k2 d= rives that come in consumer and enterprise models, such as Hitachi Desk= star and Ultrastar. The latter is said to have better bearings etc, alt= hough I don't know the difference for sure. With WDs large drives, most= of the difference is said to be in the firmware (such as TLER in the e= nterprise/RAID drives). Comparing "nearline" and "enterprise" like done= here, is merely a comparison of small and large drives, where it's wel= l known that the smaller (less dense) drives have less errors. 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