On 12/22/07, Janek Kozicki [off-list ref] wrote:

Michael Tokarev said:     (by the date of Fri, 21 Dec 2007 23:56:09 +0300)

quoted

Janek Kozicki wrote:

quoted

what's your kernel version? I recall that recently there have been
some works regarding load balancing.

It was in my original email:
The kernel is 2.6.23

Strange I missed the new raid10 development you
mentioned (I follow linux-raid quite closely).
What change(s) you're referring to?

oh sorry it was a patch for raid1, not raid10:

  http://www.spinics.net/lists/raid/msg17708.html

I'm wondering if it could be adapted for raid10 ...

Konstantin Sharlaimov said:     (by the date of Sat, 03 Nov 2007
20:08:42 +1000)

quoted

This patch adds RAID1 read balancing to device mapper. A read operation
that is close (in terms of sectors) to a previous read or write goes to
the same mirror.

Looking at the source for raid10 it already looks like it does some
read balancing.
For raid10 f2 on a 3 drive raid I've found really impressive
performance numbers - as good as raid0. Write speeds are a bit lower
but rather better than raid5 on the same devices.

-- 
Jon