Return-Path: X-Original-To: apmail-cloudstack-users-archive@www.apache.org Delivered-To: apmail-cloudstack-users-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 01BA81077E for ; Wed, 5 Mar 2014 04:32:14 +0000 (UTC) Received: (qmail 52956 invoked by uid 500); 5 Mar 2014 04:32:12 -0000 Delivered-To: apmail-cloudstack-users-archive@cloudstack.apache.org Received: (qmail 52748 invoked by uid 500); 5 Mar 2014 04:32:11 -0000 Mailing-List: contact users-help@cloudstack.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: users@cloudstack.apache.org Delivered-To: mailing list users@cloudstack.apache.org Received: (qmail 51661 invoked by uid 99); 5 Mar 2014 04:32:09 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 05 Mar 2014 04:32:09 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of nishan.sanjeewa@gmail.com designates 209.85.217.178 as permitted sender) Received: from [209.85.217.178] (HELO mail-lb0-f178.google.com) (209.85.217.178) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 05 Mar 2014 04:32:02 +0000 Received: by mail-lb0-f178.google.com with SMTP id s7so323703lbd.9 for ; Tue, 04 Mar 2014 20:31:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=Zy+LmS5hS+PZgeGv8BkZCLBl0zOzVtRXUKfqIK8pobM=; b=I/EoZH5O94mSGyZCFE6FwtidIKEARJMW0+J3vRCz/RDcnHOT6ZyB1/mKP8xo75c96E YXdc06uK262uScfLdZX3eIJ4pSwjQYKODVPlcjFIP3gluyvjouhX5KBqXair9iFktQ/P uzHhvKOYFGhtecKvksf2GHXXtHYHLpP/dL7AmvGdYCQBEWtb4J4yg44mMKSn0+fkACtY /chEj5Ab7hrRIfwg1L5S6JOZOwhzUsNd3hcEnuJh6/jPN4nuTaEC+IwWxtuBXRGlxdkr ZP0sPYdytSFGuLznw0iM9Kv/NTLMyt0IpKoLBBrftKNHWnbQBRMmT/cOa1PfrzEFqt03 v+MA== MIME-Version: 1.0 X-Received: by 10.112.73.100 with SMTP id k4mr1828600lbv.25.1393993901957; Tue, 04 Mar 2014 20:31:41 -0800 (PST) Received: by 10.114.23.164 with HTTP; Tue, 4 Mar 2014 20:31:41 -0800 (PST) Date: Wed, 5 Mar 2014 15:31:41 +1100 Message-ID: Subject: Disk IO on Cloudstack VMs From: Nishan Sanjeewa Gunasekara To: users Content-Type: multipart/alternative; boundary=001a11c243585868ce04f3d47fbf X-Virus-Checked: Checked by ClamAV on apache.org --001a11c243585868ce04f3d47fbf Content-Type: text/plain; charset=ISO-8859-1 Hi, I'm running CS 4.2.1 on XenServer 6.2 hosts. My primary storage is a ZFS file system provided via NFS. When I do a dd test directly from one of the hosts on the NFS mount I get a write speed of about 150MBps dd if=/dev/zero of=test.dmp bs=1M conv=fdatasync count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 6.99829 seconds, 150 MB/s But when I do the same test on a Cloudstack VM running on the same host (root disk on the same nfs mount ofcourse) I get a very low write speed. 20MBps. dd if=/dev/zero of=test.dmp bs=1M conv=fdatasync count=1000 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 44.6171 s, 23.5 MB/s Any ideas how I can improve this ? Regards, Nishan --001a11c243585868ce04f3d47fbf--