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From: Eugene Vilensky <evilensky@gmail.com>
Date: Mon, 11 Jan 2010 19:13:24 -0600
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Subject: Re: [linux-lvm] LVM preference for multipath verses disk/by-id/scsi
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On Mon, Jan 11, 2010 at 10:06 AM, Simon Loewenthal/NL/Tele2
<simon.loewenthal@klunky.co.uk> wrote:
> I don't see the connection with multipath and the lvm.conf? =EF=BF=BDMult=
ipath
> is running well.

<quote>
How do I really know LVM is really using the mutlipath other than
disabling one of the ports on the switch, which I don't wish to do on a
production box.
</quote>

multipath -ll will show you your multipath topology.  you can then see
if the top-level multipath device matches the pvs that are in use
(such as pvdisplay -v).

For "testing" multipathing, which you say is running well, look into
dmsetup with which you can alter the topology and remove paths.