From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: expected I/O / rand 4k iops Date: Thu, 11 Apr 2013 09:27:12 +0200 Message-ID: <516665D0.8080704@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ph.de-nserver.de ([85.158.179.214]:36213 "EHLO mail-ph.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752953Ab3DKH1V (ORCPT ); Thu, 11 Apr 2013 03:27:21 -0400 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: "ceph-devel@vger.kernel.org" Hello list, is there any calculation of expected I/O available? I've a test system running 6 hosts 4 OSDs each using SSD - i get 20.000 to 40.000 IOP/s not as much as i expected but OK right now. If i replace the SSDs on one host with spinning disks but still using dedicated journal on ssd (20GB / Disk/OSDK), i'm not able to get more than 300 to 400 iop/s this seems to be pretty low. Everything tested using 0.56.4 and Qemu RBD. Greets, Stefan