Re: MD performance options: More CPU’s or more Hz’s?

[jim owens <jowens@hp.com>]

jim owens wrote:
>> So the proper comparison of raid6 software overhead is to
>> run the same application writing a fixed large amount of data
>> to 4 drives at raid0 and the same 4 drives at raid6.

Actually, it is probably better to run the application with

   2 X data to raid0 and 1 X data to raid6

so the amount of written disk data is the same.

That way the comparison will remove the bus/disk difference
caused by sending different amounts of data and:

overhead = raid6_time - raid0_time;

jim