One thing to note, is that linux's md sets the readahead to 8192 by default instead of 128. I've noticed that in many situations, a large chunk of the performance boost reported is due to this alone.
On 2/18/09 12:57 AM, "Grzegorz Jaśkiewicz" <gryzman(at)gmail(dot)com> wrote:
have you tried hanging bunch of raid1 to linux's md, and let it do
raid0 for you ?
I heard plenty of stories where this actually sped up performance. One
noticeable is case of youtube servers.