Wy don' t you cluster the three "zones" database, filesystem, storage, cpy, memory etc ...)
Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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That is why you should let lmce manage the drives and never go messing around with mounting (or exporting) drives yourself.