Now that version 6.2 is offering the choice of dual parity, many of you will be facing a decision as to whether to implement dual parity or remain with single parity.  It might seem to be a 'no-brainer' to move to dual parity but there is considerable expense involved with that move as most of you will realize! At that point, you might well be wondering what the risk/benefit truly is.    Finding data on the the failure rates of hard drives is rather difficult to come by.  Most manufact