Acer PCI Disk Array Controller Drivers 08P4100 - Manual (Page 72)

Installing Mylex Disk Array Controller Tape Drivers
5-12 PCI Disk Array Controller Drivers Manual
Tune the following parameters:
SDSKOUT – Set this value to a number equal to 126 divided by the number
of system drives being used. If required, round down the result to the next
lower value so that its multiple does not exceed 126.
NMPBUF – Set this parameter for controller driver version 4.x or above.
Use the sar -h command to find the Scatter/Gather Buffer utilization and the
Out of scatter/Gather buffers condition to set the buffer parameters.
Since the system configuration and the test suites differ significantly, the
best way to tune either of these parameters is to evaluate the system activity
report data. Refer to the SCO UNIX documentation for more information on
methods and procedures that relate to acquiring and interpreting sar data.