When I first learned about RAID, there was no mention of RAID 6 or RAID DP (Duel Paity), there was only RAID 5 which looked very promising as a viable solution.
However now Network Attached Storage has become far cheaper and is now affordable for small businesses anf for SME's some new RAID configurations have come on the market which look a lot more reliable and protect data more than RAID 5.
Of course the newer RAID configurations are going to be more expensive, but in the long term if they protect your data better then they are in my opinion worth the extra Initial Outlay.
The Newer RAID configurations that to my mind will suit SME's and form a large part of Network Attached Storage solutions are RAID 4 and RAID 6 or RAID DP.
While RAID 5 offers the same fault tolerance of RAID 4, being that of if one disk goes down the data can then be rebuilt RAID 4 is a more stable solution and here is why.
In RAID 5 the data is stored on three disks, and also the parity bit ( the bit with the whole data setup) is written to one of the three drives in turn whereas the RAID 4 configuration has a fourth disk which is there specifically to hold the parity information.
RAID 6 or RAID DP goes that extra bit burther DP stands for duel parity because instead of storing a parity bit on one disk as in RAID 4, it stores two sets of parity on two seperate disks and can thus handle two of the three data disks going down.
So in my Mind RAID 6/DP is the way to go
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