From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from reti (vpn50-22.rdu.redhat.com [172.16.50.22]) by pobox.surrey.redhat.com (8.12.8/8.12.8) with ESMTP id i1DDUQ1a023244 for ; Fri, 13 Feb 2004 13:30:35 GMT Received: from joe by reti with local (Exim 4.30) id 1ArDBK-0001rd-2G for linux-lvm@redhat.com; Thu, 12 Feb 2004 09:30:50 +0000 From: Joe Thornber Subject: Re: [linux-lvm] advice sought on setting up new system Message-ID: <20040212093049.GA7137@reti> References: <200402062021.i16KL7m26084@ecstasy.winternet.com> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: Sender: linux-lvm-admin@redhat.com Errors-To: linux-lvm-admin@redhat.com Reply-To: linux-lvm@redhat.com List-Help: List-Post: List-Subscribe: , List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: Date: Fri Feb 13 08:30:00 2004 List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@redhat.com On Wed, Feb 11, 2004 at 11:28:37PM +0200, Dale Gallagher wrote: > PEs(0-100) for LV /dev/mapper/v0-var-qmail-queue > PEs (101-1000) for LV /dev/mapper/v0-home-mail > > And then I find at a later stage that my queue is too > small, so append PEs (1001-1100) to the original LV > /dev/mapper/v0-var-qmail-queue. The extent size should be chosen to be a convenient size for the system administrator. Typically 4-16M these days; it tends to get bigger as hard disks grow. So the extent size is going to be far too large for you to worry about files being broken across extent boundaries. Think about the percentage of ios that will incur this extra seek that you are concerned about. - Joe