[dm-devel] raid1 round-robin scheduler

[Bryn M. Reeves]

On Fri, Dec 05, 2014 at 05:08:59PM +0400, Vasiliy Tolstov wrote:
> 2014-12-05 16:02 GMT+03:00 Bryn M. Reeves <bmr at redhat.com>:
> > iirc the patches showed no measurable performance gain.
> >
> > Regards,
> > Bryn.
> 
> 
> Yes in normal read speed not changed, but in case of fully loaded
> system when one member fully utilized by io, why performance in this
> case not increased?

I don't think this was ever really explained but the testing that was
done failed to show a benefit from the patches and as they added more
complexity to the target for no gain they were not merged.

As Zdenek says today the MD-based dm-raid targets are now available
and those should expose all the features of the MD stack (including
read balancing).

Regards,
Bryn.