From mboxrd@z Thu Jan 1 00:00:00 1970 From: ales-76@seznam.cz Subject: Re: Hardware-config suggestions for HDD-based OSD node? Date: Mon, 29 Mar 2010 07:18:00 +0200 (CEST) Message-ID: <3500.484.564-14914-1325373445-1269839880@seznam.cz> References: <23450.1269815817@n20.hq.graphstream.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <23450.1269815817@n20.hq.graphstream.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ceph-devel-bounces@lists.sourceforge.net To: ceph-devel@lists.sourceforge.net Cc: =?us-ascii?Q?Craig=20Dunwoody?= List-Id: ceph-devel.vger.kernel.org > ------------ P=F9vodn=ED zpr=E1va ------------ > Od: Craig Dunwoody > P=F8edm=ECt: [ceph-devel] Hardware-config suggestions for HDD-based OSD n= ode? > Datum: 29.3.2010 00:37:56 > As number of attached HDDs increases, I would expect to hit a number of > hardware and software resource limitations in the node. Certainly the > achievable sustained throughput of the lowest-level hardware interfaces > would be only a fraction of the aggregate-peak numbers that I listed > above. As to the number of disks, Sun Fire X4500 with 48 SATA disks showed real-wo= rld performance around 800-1000 MB/s (benchmarks on the web - iSCSI, no Cep= h). Since it is a amd64 based I guess you can get similar I/O rates from an= y Intel box on the market today, provided you have enough SATA ports and/or= PCI-E slots. One 10gbps NIC should be enough (these are usually two ported= anyway). I would say the Linux will not be the bottleneck here even if you= use software RAID. Usually it is the network or the protocol that limit th= e performance. Regards Ale=B9 Bl=E1ha ---------------------------------------------------------------------------= --- Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev