From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wil Reichert Subject: Re: Mixing 512-byte sector, and 4096-byte sector drives Date: Mon, 22 Mar 2010 17:11:44 -0700 Message-ID: <7a329d911003221711r153693f6jdaec0b4f4b3d634@mail.gmail.com> References: <4BA7FFA9.7040303@kieser.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <4BA7FFA9.7040303@kieser.ca> Sender: linux-raid-owner@vger.kernel.org To: Peter Kieser Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, Mar 22, 2010 at 4:39 PM, Peter Kieser wrote: > Hello, > > I have a 6-drive RAID6 of WD15EADS (512-byte sector) drives. One of the > drives is failing, and I have been forced to buy a WD15EARS (4096-byte > sector) drive to replace the failing drive, and it has the new "advanced > format" technology. > > Do I need to set the "XP" jumper on pins 7-8 to play nicely with the other > 512-byte sector drives in my array, or will mdraid be okay with the > 4096-byte sector drive? Will there be a performance penalty adding the drive > to my array? Did you create your RAID on the device or on a partition? If its on the entire device then you should be fine, tho this might depend on which metadata format you are using & where its located on the disc (not sure how the metadata effects data alignment). If you used a standard partitioning tool its likely your partitions start on sector 63. This can be confirmed via an fdisk -l on your other drives. If that's the case then you'll probably want to use the offest jumper. How the drive will behave with the others I have no idea. If after you add the drive and your write speeds drop dramatically then something is misaligned. Wil