Re: Random IO with md raid

Matthieu Patou
2009-12-14T09:06:08Z

Hello Goswin,
> Software raid1 will write twice as much data. That means twice as much
> data goes over the system bus and into the controler cache.
> Effectively you have halve the cache size. Maybe that is all you see.
>
> MfG
> Goswin
>
Your idea seems logical, and I took a few hours today to verify it and
it's the case as accessing the disk without software raid leads to
almost the same result as with hardware raid.

Matthieu.