From: "Bryn M. Reeves" <bmr@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: raid1 round-robin scheduler
Date: Fri, 5 Dec 2014 14:34:59 +0000 [thread overview]
Message-ID: <20141205143458.GD16315@localhost.localdomain> (raw)
In-Reply-To: <CACaajQuXv_sPwzS8ascknjAQfNY9PmkPK7ATAwEL5hJrMqJ30Q@mail.gmail.com>
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@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.
next prev parent reply other threads:[~2014-12-05 14:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-05 12:25 raid1 round-robin scheduler Vasiliy Tolstov
2014-12-05 12:38 ` Vasiliy Tolstov
2014-12-05 13:02 ` Bryn M. Reeves
2014-12-05 13:06 ` Zdenek Kabelac
2014-12-05 13:10 ` Vasiliy Tolstov
2014-12-05 13:08 ` Vasiliy Tolstov
2014-12-05 14:34 ` Bryn M. Reeves [this message]
2014-12-05 22:10 ` Vasiliy Tolstov
2014-12-08 12:23 ` Bryn M. Reeves
-- strict thread matches above, loose matches on Subject: below --
2015-02-19 7:23 konstantin
2015-02-19 15:02 ` Heinz Mauelshagen
2015-03-10 11:55 ` konstantin
2015-03-10 14:22 ` Heinz Mauelshagen
2015-03-11 7:22 ` konstantin
2015-03-11 10:55 ` Heinz Mauelshagen
2015-03-11 12:44 ` konstantin
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