Messages in this thread | | | Date | Tue, 10 Sep 2002 12:37:32 -0700 | From | Patrick Mansfield <> | Subject | Re: [RFC] Multi-path IO in 2.5/2.6 ? |
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On Tue, Sep 10, 2002 at 12:00:47PM -0700, Patrick Mochel wrote: > > On Tue, 10 Sep 2002, Patrick Mansfield wrote: > > > On Tue, Sep 10, 2002 at 10:21:53AM -0700, Patrick Mochel wrote: > > > 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
For scsi multi-path, one name; without scsi multi-path (or for individual paths that are not exposed in driverfs) each path probably needs to show up in user space with a different name so md or other volume managers can use them.
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