The only person I know here that deals with "serious data storage" is Phoenix, but he hasn't been around here for quite a while. In his school district they use Supermicro storage systems.
RAID
https://en.wikipedia.org/wiki/RAID#R...e_environments recommends use of RAID6 or RAID10 for larger arrays.
According to
https://en.wikipedia.org/wiki/RAID-Z#RAID-Z the ZFS equivalents for this are:
Quote:
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RAID-Z2 doubles the parity structure to achieve results similar to RAID 6: the ability to sustain up to two drive failures without losing data.[11] In July 2009, triple-parity RAID-Z3 was added to provide increased redundancy due to the extended resilver times of multi-terabyte disks
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Having only played with ZFS for a few months, I don't know if Hammer has features to deal with the long resilver times of large arrays.