mongrel cluster mysteriously stopping when using shared FS

I have a number of servers running mongrel cluster all of whom feed off
of a shared filesystem (OCFS2). Each cluster has its own
mongrel_cluster_web2.yml file with distinct PID and Log file names. In
theory they shouldn't be aware of each other's presence.

What I have found is that when I want to test a new set of code on one
server and I shut just that mongrel cluster down, all of its peers
shutdown as well. Any ideas as to how this is possible? It would seem
the mongrel cluster that is stopping is writing something to disk that
the others are triggering on.

I am running mongrel 1.1.4 on Centos5.1, fully patched.