Hi To-M
Thank you for your answer.
Cache mode is set to AlwaysWriteBack
From the Benchmark menu I get the next result
READ 971MB / sec
WRITE 1.1GB /sec

Any ideas?

PS I tried to change QLE2462 to QLE2562 on both sides, and I got the next result
READ STABLE 650MB /sec
WRITE UNSTABLE (witj a lot of interrupts) from 150 to 400 MB / sec