Solved

Slow performance of EXT4 drive using Libvirt/KVM/QEmu

Posted on 2010-09-16
1
1,974 Views
Last Modified: 2012-05-10
Hi experts,

How long should it take to format a 650GB drive to ext4? I am starting up my virtual machine using virsh and then formatting the additional drive which takes 7-8 hours. I am worried that performance will be an issue.

The disk part of my libvirt definition looks like this

    <disk type='file' device='disk'>
      <source file='/vm/ubuntu-kvm/root.qcow2'/>
      <target dev='hda' bus='ide'/>
    </disk>
    <disk type='file' device='disk'>
      <source file='/vm/ubuntu-kvm/data.qcow2'/>
      <target dev='hdb' bus='ide'/>
    </disk>

From what I've read I can try disable the cache somehow, but I'm not entire surely how, since the examples given were invoking kvm directly rather than through virsh. Any ideas?
0
Comment
Question by:mstrelan
1 Comment
 
LVL 10

Accepted Solution

by:
mstrelan earned 0 total points
ID: 33698166
Oh I've got it! Now it only takes 3-4 minutes instead of 7-8 hours!

   
     
     
     
   
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Netapp snapshot 9 51
Setting up a Dell Powervault MD1200 2 35
Azure web service cannot write on attached Azure  File Storage 3 38
Runtime Error -2147467259 (80004005) 7 38
When we purchase storage, we typically are advertised storage of 500GB, 1TB, 2TB and so on. However, when you actually install it into your computer, your 500GB HDD will actually show up as 465GB. Why? It has to do with the way people and computers…
Giving access to ESXi shell console is always an issue for IT departments to other Teams, or Projects. We need to find a way so that teams can use ESXTOP for their POCs, or tests without giving them the access to ESXi host shell console with a root …
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
How to install and configure Citrix XenApp 6.5 - Part 1. In this video tutorial we have explained step by step installation of Citrix XenApp 6.5 Server on Windows Server 2008 R2 is explained in this video. We have explained the difference between…

679 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question