I am running a new Dell 720 server that I have equipped with 4 intel 720 SSD drives, configured in 2 x RAID 1 drives.
Raid-layer (true hardware raid-controllers) does not support low-level commands like unmap, smart, trim, etc. Those commands are simply not passed-through to SSDs. IIRC, trim is supported by "some" controllers only for raid0-arrays (not raid1)...
