Messages in this thread | | | Date | Tue, 10 Sep 2002 12:00:47 -0700 (PDT) | From | Patrick Mochel <> | Subject | Re: [RFC] Multi-path IO in 2.5/2.6 ? |
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On Tue, 10 Sep 2002, Patrick Mansfield wrote:
> On Tue, Sep 10, 2002 at 10:21:53AM -0700, Patrick Mochel wrote: > > > > > > > Generic device naming consistency is a problem if multiple devices > > > > > show up with the same id. > > > > > > > > Patrick Mochel has an open task to come up with a solution to this. > > > > > > I don't think this can be solved if multiple devices show up with the same > > > id. If I have five disks that all say I'm disk X, how can there be one > > > name or handle for it from user level? > > > > Easy: you map the unique identifier of the device to a name in userspace. > > In our utopian future, /sbin/hotplug is called with that unique ID as one > > of its parameters. It searches for, and finds names based on the ID is. If > > the name(s) already exist, then it doesn't continue. > > > > > > -pat > > But then if the md or volume manager wants to do multi-path IO it > will not be able to find all of the names in userspace since the > extra ones (second path and on) have been dropped.
Which is it that you want? One canonical name or all the paths? I supplied a solution for the former in my repsonse. The latter is solved via the exposure of the paths in driverfs, which has been discussed previously.
-pat
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