From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joe Landman Subject: Re: The chunk size paradox Date: Thu, 02 Jan 2014 14:21:12 -0500 Message-ID: <52C5BC28.2020003@gmail.com> References: <52C1C01A.7010407@ubuntu.com> <52C57C7B.80400@shiftmail.org> <52C588A7.6010207@hardwarefreak.com> <52C59468.6080200@ubuntu.com> <52C5A9AA.9090300@hardwarefreak.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <52C5A9AA.9090300@hardwarefreak.com> Sender: linux-raid-owner@vger.kernel.org To: stan@hardwarefreak.com, Phillip Susi , joystick Cc: linux-raid List-Id: linux-raid.ids On 01/02/2014 01:02 PM, Stan Hoeppner wrote: > On 1/2/2014 10:31 AM, Phillip Susi wrote: >> On 1/2/2014 10:41 AM, Stan Hoeppner wrote: >>> First, there is no such thing as a 4K sector in Linux. Sectors are >>> 512 bytes. Filesystem blocks and memory pages are 4K. >> >> Of course there is. Disks with 4k sectors are becoming more and more >> popular. > > Please read: https://en.wikipedia.org/wiki/Advanced_Format > > There are no native 4K sector drives on the market. Linux does not Untrue. http://storage.toshiba.eu/cms/en/hdd/hard_disk_drives/product_detail.jsp?productid=452 http://www.seagate.com/www-content/product-content/constellation-fam/constellation-cs/en-us/docs/terascale-hdd-data-sheet-ds1793-1-1306us.pdf and many others. 512 byte sector native drives are now far less common, with many of the drives being native 4096 bytes with a translation layer for legacy systems that require 512 bytes. This is infamous for wreaking havoc with alignment.