MPG has recommended the OWC Thunderbay 4 for a long time, and utilizes five of them.
Now the very same configuration used by MPG is available as an even better deal: OWC 20TB Thunderbay 4 RAID-5 Edition with spare 5TB hard drive (five drives total, four in the TB4, one spare). The TB4 with 5TB drives is the “sweet spot” for price/performance.
That included spare hard drive is a cold spare, which MPG strongly recommends for RAID-5 users. Or it could be put to other uses until and unless it is needed to replace a failed drive.
This unit comes as a RAID-5, but it can be re-done to operate as single drives, RAID-1 mirror, RAID- stripe, etc—the Thunderbay 4 is eminently flexible using the provided SoftRAID software. See also: RAID-5 / RAID-4 Can be Partitioned to Suit.
Users looking for even more capacity will find the 24TB or 32TB Thunderbay 4 units.