From: Zdenek Kabelac <zkabelac@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Cc: Vasiliy Tolstov <v.tolstov@selfip.ru>
Subject: Re: raid1 round-robin scheduler
Date: Fri, 05 Dec 2014 14:06:44 +0100 [thread overview]
Message-ID: <5481ADE4.1020908@redhat.com> (raw)
In-Reply-To: <20141205130239.GC16315@localhost.localdomain>
Dne 5.12.2014 v 14:02 Bryn M. Reeves napsal(a):
> On Fri, Dec 05, 2014 at 04:38:56PM +0400, Vasiliy Tolstov wrote:
>> 2014-12-05 15:25 GMT+03:00 Vasiliy Tolstov <v.tolstov@selfip.ru>:
>>> Hello. Does the somebody create scheduler for raid1 to add ability to
>>> read data from all devices, for example i need to read from all
>>> devices when have sequential read.
>>
>>
>> I found patches in 2012 from Robert Collins, [dm-devel] Load balancing
>> reads on dmraid1 (and 01) arrays
>> why it not merged , does dm devel devs have plans to round-robin raid1
>> reading operations ?
>
> iirc the patches showed no measurable performance gain.
>
Are we talking here about rather deprecated old dm mirror usage,
or a new raid1 (mdraid) ?
I assume new dm-raid target is using everthing what md raid provides.
Zdenek
next prev parent reply other threads:[~2014-12-05 13:06 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 [this message]
2014-12-05 13:10 ` Vasiliy Tolstov
2014-12-05 13:08 ` Vasiliy Tolstov
2014-12-05 14:34 ` Bryn M. Reeves
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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