From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gabriel de Perthuis <g2p.code@gmail.com>
Subject: Re: Chicken and egg problem with multipath-tools
Date: Sun, 3 Mar 2013 11:42:25 +0000 (UTC)
Message-ID: <kgvcv1$l3e$4@ger.gmane.org>
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> The problem is that multipathd wants to create a PID file under /var
> (which is at this time readonly). This fails and multipathd fails to
> start.

Distros handle this by putting pidfiles in /run, a tmpfs set up at early 
boot. There might be some magic to ensure that later mounts don't shadow 
it.