From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Sun, 5 Aug 2001 02:28:01 +0200 From: =?iso-8859-1?Q?Ragnar_Kj=F8rstad?= Subject: Re: [linux-lvm] LVM with multi-path disks? Message-ID: <20010805022800.A26419@vestdata.no> References: <3B6B30C4.B4427F3D@cup.hp.com> <20010804174049.B564@colombina.comedia.it> Mime-Version: 1.0 In-Reply-To: <20010804174049.B564@colombina.comedia.it>; from Luca Berra on Sat, Aug 04, 2001 at 05:40:49PM +0200 Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@sistina.com On Sat, Aug 04, 2001 at 05:40:49PM +0200, Luca Berra wrote: > On Fri, Aug 03, 2001 at 04:16:20PM -0700, John DeFranco wrote: > > Does LVM work with multi-path disks? For example I have > > a fibre channel configuration in which I have two paths > > to each disk. I pvcreate a disk and am able to use it > > within a vg but when I reboot and do a vgscan, lvm cannot > > find any vg's. If I remove the second path lvm can see > > the vg fine. > > John, there is an addition for multi-path to the md driver > you can fetch it from the redhat source kernel rpm. > you can then stack lvm on top of md to achieve your goal E.g. you have a md0 device consisting of sda and sdb - would not lvm find three different paths to the same data (sda, sdb, md0) when scanning for physical volumes? Will that not cause problems? >From John's description it looks like vgscan can't handle multiple path - and that's the problem - not that it is not able to take advantage of it (loadbalance / failover). -- Ragnar Kjorstad Big Storage