Comment by bbatha

> The 1 gig per TB figure is ONLY for when using the ZFS dedup feature, which the ZFS dedup feature is widely regarded as a bad idea except in VERY specific use cases. 99.9% of ZFS users should not and will not use dedup and therefore they do not need ridiculous piles of ram.

You also really don't need a 1GB for RAM unless you have a very high write volume. YMMV but my experience is that its closer to 1GB for 10TB.