linux-kernel - Re: clustered MD

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Message-ID: <557842CE.2040204@suse.com>
Date:	Wed, 10 Jun 2015 08:59:42 -0500
From:	Goldwyn Rodrigues <rgoldwyn@...e.com>
To:	Richard Weinberger <richard.weinberger@...il.com>
CC:	David Teigland <teigland@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, NeilBrown <neilb@...e.de>
Subject: Re: clustered MD



On 06/10/2015 03:00 AM, Richard Weinberger wrote:
> On Wed, Jun 10, 2015 at 5:33 AM, Goldwyn Rodrigues <rgoldwyn@...e.com> wrote:
>> David Lang has already responded: The idea is to use a RAID device
>> (currently only level 1 mirroring is supported) with multiple nodes of the
>> cluster.
>>
>> Here is a description on how to use it:
>> http://marc.info/?l=linux-raid&m=141935561418770&w=2
>
> Sorry if this is a stupid question, but how does this compare to DRBD?
>

No, it is not.

DRBD is for local devices synced over the network. Cluster-md is for 
shared devices such as SAN, so all syncs happen over the FC.
DRBD works for two nodes (until recently), cluster-md works for multiple 
nodes.

-- 
Goldwyn
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