On Jul 22, 2011, at 10:31 PM, Apostolos Pantazis wrote:

> Last time I checked they did not support snapshots on a running VM and that 
> was a issue at least for us other than that (which may not even be true 
> anymore) it looked very promising 


Correct me if I'm wrong, but I had the understanding that neither Xen nor KVM 
were capable of doing VMware-style full-state snapshots at all. I don't recall 
seeing the feature when I was last using XenServer and I know from experience 
that the only snapshotting available on plain Linux distributions is to either 
use LVM and use a logical volume as the VM's "disk", or disk images with a tool 
like qemu-img.

Neither alternative preserves full VM state, though, so if you do a snap on Xen 
or KVM while the VM is running, it's crash-consistent at best.

Of course, VMware has the two disadvantages of introducing Windows if you're 
deploying it in a Unix/Linux-only shop (which my coworkers are exceptionally 
resistant to), and their new pricing structure, which hiked licensing numbers 
and fees for just about every configuration.

Gregory

-- 
Gregory K. Ruiz-Ade <[email protected]>
OpenPGP Key ID: EAF4844B  keyserver: pgpkeys.mit.edu



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