Hi, here is a draft of the paper describing our running Hadoop NN on persistent memory. Two promises are: (1) survives power failure, (2) has no limitation on memory site. Your critique is welcome
http://hadoopilluminated.com/resources/ImprovingHadoopreliabilitywithpersistentmemorydeviceXPDfromKove.pdf Thank you. Sincerely, Mark