Originally Posted by Sgt_Strider
I was going to suggest that. Maybe you or any other "expert" on this can compile a list of pros and cons of RAID 5, WHS, and even give a recommendation for an ideal and realistic setup for 70-80% of users.
I don't have time to do a comprehensive list, but since you asked about WHS I'll add a few notes for all of the key options that may be helpful ...
(a) WHS => No fault tolerance; but can be set to maintain duplicates, which it will keep on different disks ... so if you do that then you won't lose anything with a single disk failure. It also doesn't stripe the data, so any data loss you do encounter is limited to data on the actual failed drive (not in a larger array).
(b) RAID-5 => Tolerates a single drive failure. Multiple drive failures => loss of the entire array. (there are exceptions if the drive doesn't totally fail ... but for planning purposes you should assume 2 failures = total loss).
(c) RAID-6 => Tolerates two drive failures. Otherwise like RAID-5.
(d) UnRAID => Tolerates a single drive failure. Does not stripe the data, so a dual drive failure will only result in loss of the data on the failed drives. Since it's the most-used drive, there's a good chance that a dual drive failure would include the parity drive ... if so you'd only lose one drive's worth of data (again, that's in a two-drive failure condition).
RAID-5 & RAID-6 give much better speeds, since they stripe the data. UnRAID and WHS will have read speeds equivalent to the individual drives. (Still likely plenty fast for what most folks are doing in this forum).
UnRAID requires a dedicated system just to maintain the array. Boots off a USB key. WHS has a lot of neat additional features -- automatic image backup of all your other windows machines; automatic duplication IF you have the disks and set it to do so; etc. RAID-5 & 6 controllers can be used in an existing system ... although for large arrays these are generally going to be dedicated systems as well.
I'm "playing" with an UnRAID setup that seems to work pretty well ... I plan to try a WHS system next, and will likely use one of the two.