Support LQ: Use code LQ3 and save $3 on Domain Registration
Go Back > Forums > Linux Forums > Linux - Virtualization and Cloud
User Name
Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.


LinkBack Search this Thread
Old 11-05-2012, 01:36 AM   #1
Senior Member
Registered: Apr 2004
Location: Potchefstroom, South Africa
Distribution: Fedora 17 - 3.3.4-5.fc17.x86_64
Posts: 1,475

Rep: Reputation: 87
Is it safe to cp a qcow2 vdisk for non-running Qemu-KVM instance to back it up?

Hi Guys

As stated - if I stop a Qemu-KVM guest instance (e. g. shutdown -h now inside it and wait for the VM to close "naturally") and I then copy the qcow2 format disk image it runs on out of the host, is that a safe way to backup the VM??

E. g. my idea is to stop the VM, copy the .qcow2 virtual disk image elsewhere, then restart the VM.

If a disaster on physical hardware, simply reinstate / replace hardware and host OS, copy the qcow2 VM virtual disk image back, and start it up again using qemu-system-x86_64 vdisk.img?

Will this work? Also given that the qcow2 file is at the moment only 20GB in size but is set to "actually" be a 1.0TB file... can "sparse" qcow2 format Qemu-KVM VM files be safely backed up this way - by simply copying it while the relevant VM is in a shut down state with the idea to copy that file back in after a disaster and simply start it up again?

Old 11-07-2012, 06:08 AM   #2
Senior Member
Registered: Apr 2004
Location: Potchefstroom, South Africa
Distribution: Fedora 17 - 3.3.4-5.fc17.x86_64
Posts: 1,475

Original Poster
Rep: Reputation: 87
For interested parties - I went ahead and tested this. I stopped the KVM Qemu VM running off my disk image. Once it was safely stopped, I simply copied the file to another file. Then, as a test, I started the copy and it seemed to work I'm assuming as long as the VM is stopped, it is fine to copy the qcow2 file it runs off as a backup of the VM.
Old 11-07-2012, 04:50 PM   #3
Registered: Mar 2008
Posts: 10,283

Rep: Reputation: 1258Reputation: 1258Reputation: 1258Reputation: 1258Reputation: 1258Reputation: 1258Reputation: 1258Reputation: 1258Reputation: 1258
Thanks for the update. You had a different post on basically the same subject, kind of what I said.


backup, kvm, qemu

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
LXer: Set up qemu-kvm-1.0+noroms as spice enabled qemu server vs qemu-kvm-spice on Ubuntu Precise LXer Syndicated Linux News 0 05-26-2012 07:41 AM
kvm-qemu-img: qcow2 disk image format changes to raw format in RHEL-KVM 5.6 rajivdp Linux - Virtualization and Cloud 2 09-19-2011 11:23 AM
[Debian/Qemu/KVM] Why qemu --enable-kvm works but not kvm directly? gb2312 Linux - Virtualization and Cloud 2 03-21-2011 02:05 PM
LXer: Set up RH VirtIO SCSI driver on Windows XP KVM at KVM-QEMU Instance on F14 LXer Syndicated Linux News 14 01-09-2011 12:21 PM
LXer: Install Oracle 11gR2 on SL6 KVM at KVM-QEMU Instance on SL 6 (alpha 3) LXer Syndicated Linux News 2 01-01-2011 06:42 AM

All times are GMT -5. The time now is 12:30 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration