From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zdenek Kabelac Subject: Re: raid1 round-robin scheduler Date: Fri, 05 Dec 2014 14:06:44 +0100 Message-ID: <5481ADE4.1020908@redhat.com> References: <20141205130239.GC16315@localhost.localdomain> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20141205130239.GC16315@localhost.localdomain> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development Cc: Vasiliy Tolstov List-Id: dm-devel.ids 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 : >>> 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