When using a WAVE Server with RAID configuration and the message "Not enough HDD/SSD speed for recording" displays, try the following.
Locate the MegaRAID Storage Manager utility in Windows.
Enter user Name and Password, the username is admin, the password is the Windows password.
Once logged in please click on the Logical tab and choose Virtual Drive.
Right Click Virtual drive and select Set Virtual Drive Properties.
On Write Policy please select Always Write Back, please don't choose select Write Through.
Please refer to the graphic below of the incorrect selection which HDD F has reached 100% utilization.
Below is a graphic showing the correct selection and better utilization.