From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: mdadm striped parity RAID with Advanced Format drives Date: Thu, 21 Jul 2011 05:26:22 -0500 Message-ID: <4E27FECE.8010201@hardwarefreak.com> References: <201107211011.40151.polhallen@fuckaround.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <201107211011.40151.polhallen@fuckaround.org> Sender: linux-raid-owner@vger.kernel.org To: Pol Hallen , linux-raid List-Id: linux-raid.ids On 7/21/2011 3:11 AM, Pol Hallen wrote: > Hello and sorry if I write you in private.. No worries. I'm taking this back on list as others have more experience with this than me. > about 2Tb wd and 4Kb size, is there a howto to check and correct the size of > these disks? > > Can you tell me how? > Model Number: WDC WD20EARS-00MVWB0 1. Can one create a RAID5 from bare (partition-less) AF drives and avoid the read-modify-write problem? 2. Or is one required to assemble the array from properly aligned partitions created on each drive? Pol, *IF* the answer to #1 is yes, creating the array properly becomes easier. Simply create the array with raw device names and no partition numbers, for example, sd[a,b,c,d,e,f]. If you've already created partitions on the drives, wipe everything off all drives, including the partitions tables. If the answer to #1 is 'no', and to #2 is 'yes', then you need to follow the instructions posted by Erwan Leroux. -- Stan