From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: Linear mode: array size is less than sum of sizes Date: Tue, 05 Jan 2010 20:13:18 +0000 Message-ID: <4B439D5E.2010107@anonymous.org.uk> References: <4B439BC8.1030908@anonymous.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4B439BC8.1030908@anonymous.org.uk> Sender: linux-raid-owner@vger.kernel.org To: Alessandro Baretta Cc: linux-raid List-Id: linux-raid.ids On 05/01/2010 20:06, John Robinson wrote: > On 05/01/2010 18:21, Alessandro Baretta wrote: >> Hi guys. >> >> I have a bizarre problem. Hopefully someone will provide some insight. > [...] >> As you can see the computed size is 67 sectors less than the reported >> size. What happened to those sectors? > > At the very least md linear mode will round down the constituent devices [...] Try playing with dm instead of md - `man dmsetup` suggests it may be able to do a linear concatenation in single-sector amounts... Cheers, John.