So... I've been curious about ZFS for a while, and I bought a 2010 base model Mac Pro to play around with. The sweet spot for memory cost per GB seems to be 8GB sticks, so I figured I would put 3 of those in, for a total of 24 GB of RAM. I thought I would dedicate 3 of the SATA sleds to ZFS, and keep one as HFS+ (may eventually do a fusion drive with an SSD on a PCI card). I would like to be able to do snapshots of the other computers in the house as they back up to this machine with Carbon Copy Cloner, so it sounds like the de-duplication feature would really help keep the actual storage utilization down. I've seen it mentioned that one should budget 5GB RAM per TB stored when using de-duplication; if I were to put 2TB disks in each of the three ZFS sleds would I be getting up to 4TB useful storage, and would the 24GB RAM likely be enough?
Any strong recommendations on whether o3x runs better on Yosemite or El Capitan?
Thanks for your advice,
Kurt