[dm-devel] [PATCH v2] multipath: add find_multipaths feature.

[Benjamin Marzinski]

On Thu, Sep 01, 2011 at 09:14:23AM +0200, Christophe Varoqui wrote:
> On mer., 2011-08-31 at 21:55 -0500, Benjamin Marzinski wrote:
> > This adds a new default feature, find_multipaths. When this is set to yes,
> > multipath will no longer try to create a multipath device for every
> > non-blacklisted device. Instead, it will only create a device when one of
> > three conditions are met.
> > 
> > 1. Three are at least two non-blacklisted paths with the same wwid
> > 2. The user manually forces the creation, by specifying a device with the
> >    multipath command.
> > 3. A path has the same wwid as a multipath device that was previously crreated
> >    (even if that multipath device doesn't currently exist).
> > 
> Hannes,
> 
> this patch implements complex semantics and mis-use /etc to store
> variable data (/run was suggested as a replacement). Though I realize
> the benefits, I'm not at ease merging it.

This will add wwids to the wwids file at the same times that new bindings
get added to the bindings file. We decided to move the bindings file to
/etc/multipath/bindings because it caused problems during bootup, if
/var/run was not mounted.  This will have the same problems where you
will be writing to a file that eventually gets mounted over.  So I am
against using /var/run

-Ben

> 
> Mike Snitzer pushed for its inclusion, but I don't remember your
> commenting. Would your care to ?
> 
> Regards,
> 
> -- 
> Christophe Varoqui
> OpenSVC - Tools to scale
> http://www.opensvc.com/
> 
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