From mboxrd@z Thu Jan 1 00:00:00 1970 From: Janek Kozicki Subject: Re: Severe slowdown with LVM on RAID, alignment problem? - Autodetect? Date: Tue, 4 Mar 2008 20:52:48 +0100 Message-ID: <20080304205248.08b92217@szpak> References: <872d9b69db95a1b08319e935595743cc@localhost> <47C7E086.5080203@rabbit.us> <47C9C086.4020805@tmr.com> <84E2E8E9-9E43-497E-9680-CC0377A8BEDF@it-loops.com> <47CB0A9C.7030902@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <47CB0A9C.7030902@tmr.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hello I was wondering, that maybe someone from our community, skilled enough, could submit a patch to LVM which will enable autodetection of RAID stripes in the underlying device? We would no longer suffer any slowdowns, then ;-) If LVM cannot communicate with RAID layer (eg. because it's too difficult, since /dev/md0 is *only* a block device) - then LVM could do empirical autodetection by writing data to /dev/md0 (*) and reading data from /dev/sda3 (*), /dev/sdb3 (*) and comparing it. (*) those are just an example values, of course. They would be a command line parameters for that ;-) best regards -- Janek Kozicki |