With Raid 0, 1 there is no problem.
But with Raid 5, 6, 50 there is slow file transfer problem.
With Raid 0, 1 there is no problem.
But with Raid 5, 6, 50 there is slow file transfer problem.
Oops!
After I turned on the write back cache, the transfer rate came to normal.
I'm sorry to have bothered you.
Thank you all.