>> Не только. ZFS разрабатывали в том числе для использования с SSD. ;)
> Ага, правда SSD в природе не было в момент дизайна ZFS, но
> изена такие мелочи не волнуют, как обычно. Он лучше будет маркетинговый
> булшит от санок повторять как мантру, ведь верить в это намного
> приятнее, правда? :)

Там другое. Например, группировка сбросов на диск по их рейтингк.

ttp://constantin.glez.de/blog/2011/02/frequently-asked-questions-about-flash-memory-ssds-and-zfs

ZFS also has a sophisticated cache called the "Adaptive Replacement Cache" (ARC) where it stores both most frequently used blocks of data and most recently used ones. The ARC is stored in RAM, so each block of data that is found in the RAM can be delivered quickly to the application, instead of having to fetch it again from disk. When RAM is full, data needs to be thrown out of the cache and is not available any more to accelerate reads.
SSDs can be used as a second level cache: Blocks that can't be stored in the RAM-based ARC can then be stored on SSDs and in case they're needed, they can still be delivered quicker to the application than by fetching them again from disk. An SSD that is used as a second level ARC is therefore called an L2ARC, or a "cache device".

Поэтому жретъ памяти, зараза :)