From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fyodor Ustinov Subject: rbd speed: write vs read Date: Fri, 06 May 2011 16:58:21 +0300 Message-ID: <4DC3FE7D.3090903@ufm.su> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.ufm.su ([77.120.103.19]:48727 "EHLO mail.ufm.su" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753625Ab1EFN6X (ORCPT ); Fri, 6 May 2011 09:58:23 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.ufm.su (Postfix) with ESMTP id 1F2B060023E for ; Fri, 6 May 2011 16:58:22 +0300 (EEST) Received: from mail.ufm.su ([127.0.0.1]) by localhost (mail.ufm.su [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6AZA2xILl2va for ; Fri, 6 May 2011 16:58:22 +0300 (EEST) Received: from [192.168.2.22] (unknown [94.232.181.14]) by mail.ufm.su (Postfix) with ESMTPSA id A22C4600238 for ; Fri, 6 May 2011 16:58:21 +0300 (EEST) Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Hi! root@stb1:~# dd if=/dev/zero of=/dev/rbd0 bs=10240000 ^C13217+0 records in 13217+0 records out 135342080000 bytes (135 GB) copied, 1135.75 s, 119 MB/s root@stb1:~# dd if=/dev/rbd0 of=/dev/null bs=10240000 ^C930+0 records in 929+0 records out 9512960000 bytes (9.5 GB) copied, 394.773 s, 24.1 MB/s It's my misconfiguration? P.S. 20 OSD servers, 2*1G ether. WBR, Fyodor.