From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bryant Ng Subject: Re: Crush and Monitor questions Date: Tue, 11 Dec 2012 17:15:36 -0800 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from plane.gmane.org ([80.91.229.3]:60863 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753486Ab2LLBQB (ORCPT ); Tue, 11 Dec 2012 20:16:01 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Tiavj-00040E-1Q for ceph-devel@vger.kernel.org; Wed, 12 Dec 2012 02:16:11 +0100 Received: from 50-76-54-11-ip-static.hfc.comcastbusiness.net ([50.76.54.11]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 12 Dec 2012 02:16:10 +0100 Received: from bryantng by 50-76-54-11-ip-static.hfc.comcastbusiness.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 12 Dec 2012 02:16:10 +0100 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Sorry, I misread the Hardware Configuration section of the Ceph documentation. I thought one of the Dell's was a configuration for the monitors but both of the Dell R510 and R515 are OSD configuration. I had another question on the monitors though. What kind of load (requests/second) can a monitor node handle? My understanding is that it just returns the cluster map to the client requesting it? The documentation mentions 3 to 5 monitors in a ceph cluster but what is the request rate expected on each of these monitors? thanks. Bryant Bryant Ng wrote: > Hi, > > I'm pretty new to Ceph and am just learning about it. > > Where are the CRUSH maps stored in Ceph? In the documentation I see you > use the 'crushtool' to compile and decompile the crush map. I > understand that if a single monitor comes online, it can talk to the > other existing monitors to get the cluster map but how does it work on > initial startup? Or if the entire Ceph clusters goes down b/c of power > failure or something. > > What is the recommended hardware configuration for monitors? In the > Hardware Recommendation page it says "A monitor requires approximately > 10GB of storage space per daemon instance." per daemon instance is > talking about the monitor daemon, not the osd daemons? > > Also further down on that page, it list some hardware examples where it > mentions a ligher configuration for monitors. I am assuming that is the > Dell PE R510 which contains 8 x 2 TB drives. Why does the monitor need > so much space if it's "10GB of storage space per daemon instance". > > -Bryant > > -- > 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 >