L2ARC in Hardware
It was obvious, that someone would take the idea of the L2ARC - an additional read cache on a SSD - and implement in hardware: Adaptec announced a RAID controller with a SSD. The kicker is a firmware that is able to cache frequently used blocks in the SSD. One advantage of the ZFS solution is obvious … it’s free of charge, it runs with other target than just the SAS devices conntected to the devices. The advantage of the Adaptec solution is obvious as well … Windows and Linux now have something similar to L2ARC.