SSC-Addicted,
There is no SAN here, no HBA, etc... everything local. 8 SSD in a raid 10 array and 1 volume.
as i stated in my first post this is...

Gail,
first, thanks for your answer
maybe log flushes are synchronous but i think it's not alot. on similar(test) server with 2 disk raid 1 SSD i can reach 7K...