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Posted to commits@cloudstack.apache.org by GitBox <gi...@apache.org> on 2019/05/30 17:30:19 UTC

[GitHub] [cloudstack] Slair1 commented on issue #3194: Suspending a VM before snapshot deletion (see PR #3193)

Slair1 commented on issue #3194: Suspending a VM before snapshot deletion (see PR #3193)
URL: https://github.com/apache/cloudstack/pull/3194#issuecomment-497413681
 
 
   @melnik13 @rhtyd 
   From everything I've been able to find, it isn't supportable to take snapshots of volumes on running VMs w/ KVM.  I see in the CloudStack code, this functionality is also disabled by default with "kvm.snapshot.enabled" set to false by default.  The code does however allow snapshots if VMs are stopped or the volume is detached.
   
   Here is a link to an article talking about not using qemu-img to take snapshots of running VMs (there are lots of other posts/pages agreeing).  
   
   https://www.cyberciti.biz/faq/how-to-create-create-snapshot-in-linux-kvm-vmdomain/
   
   Should we be suspending the VM before taking the snapshot?  Is suspending enough to prevent corruption or is it just "safer"?  We are just very gun shy with snapshots on KVM after experiencing corruption on several VMs...
   
   Thanks for any input!
   

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