From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Kleijkers Subject: Re: Can we have mutiple OSD in a single machine Date: Wed, 11 Apr 2012 09:53:38 +0200 Message-ID: <4F853882.8010001@unilogicnetworks.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-out117.unilogicnetworks.net ([62.133.206.117]:52450 "EHLO mail.unilogicnetworks.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753619Ab2DKHxk (ORCPT ); Wed, 11 Apr 2012 03:53:40 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Madhusudhana U Cc: ceph-devel@vger.kernel.org Hello, Yes that's no problem. I'm using that configuration for some time now. Just generate a config with multiple OSD clauses with the same node/host. With the newer ceph version mkcephfs is smart enough to detect the osd's on the same node and will generate a crushmap whereby the objects get replicated to different nodes. I didn't see any impact on the performance (if you have enough processing power, because you need more of that). I wanted to use just a few OSD's per node with mdraid, so I could use RAID6. This way I could swap a faulty disk without bringing the node down. But I couldn't get it stable with mdraid. Stefan On 04/11/2012 09:42 AM, Madhusudhana U wrote: > Hi all, > I have a system with 2T SATA drive and I want to add it to my ceph > cluster. I was thinking instead of creating one large OSD, can't > I have 44 osd's of 450G each ? Is this possible ? if possible, will > this improve read/write performance ? > > Thanks > __Madhusudhana > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >