I used perl on shared storage too with NFS but with mod_perl things are different, you will need to compile the module for your apache installation (not instance) and perl version. You can run different instances of apache with the same installation. If you have the same version of perl and apache on all your machines you can tweak a shared perl/mod_perl stuff but we talk hear about a module. If you are in a virtualized environment I would go with a template deployment, otherwise RPMs. You can then create debian packages, I don't know your OS and I hope is not windows.
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