From mboxrd@z Thu Jan 1 00:00:00 1970 From: Malahal Naineni Subject: Re: [BUG] multipath-tools: uuid has become meaningless Date: Tue, 20 Jul 2010 15:06:44 -0700 Message-ID: <20100720220644.GA25337@us.ibm.com> References: <20100719224528.GA23414@us.ibm.com> <1279604124.2841.5.camel@Nokia-N900-42-11> <20100720065410.GA3166@us.ibm.com> <4C454D8A.3020203@suse.de> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <4C454D8A.3020203@suse.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids Hannes Reinecke [hare@suse.de] wrote: > Malahal Naineni wrote: > > This is where I was heading. I did some investigation and found that we > > really need to rename to wwid based names before we finally rename to > > the intended name. So we may actually have two passes just to rename > > (first to wwid based names and then to actual names). Also the current > > code doesn't do rename followed by reload even if it is needed. Someone > > sets friendly name and some other defaults that need reload like path > > grouping policy etc, we just rename! Probably a bug in itself. > You sure? I would rather rely on device-mapper uuids here. Hannes, I am not sure what you are referring to when you say, "You sure?" Are you saying if I am sure about this bug? If so, you can see yourself by swapping couple entries in the bindings file. As I said, you will notice this bug only when you enable 'user_friendly_names' in initrd in real life! > So we can use the known naming scheme for the uuid to regenerate the > wwid; with this we can identify/access the device and we should be able to > make do with just one pass. Say, you have "mpath0[uuid0]" and "mpath1[uuid1]" loaded currently. How can we rename mpath0 to mpath1 and vice-versa? It does require an intermediate step of renaming to something else, right? Thanks, Malahal.