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From Fang Wang <>
Subject RE: VM Snapshot progress update
Date Tue, 20 Nov 2012 03:23:54 GMT
Hi Mice, 

Thanks for the doc. I have couple of questions:
1. Do you set a upper limit on how many VM snapshots can be created on a VM / cluster?
2.  If we have 3 vm snapshots,
	 C       where A is the parent of B and B is parent of C.
If we remove B, do we update the parent snapshot for C?

3.  between B and C,  there are some disks removed from the VM; we take snapshot C.  
When we want to revert back to snapshot B, how do you handle the disks missing?


-----Original Message-----
From: Mice Xia [] 
Sent: Sunday, November 18, 2012 7:23 PM
Subject: VM Snapshot progress update

Hi, Folks,

Sorry for the late update. I have been busy recently and haven’t updated this for awhile.
Yesterday I re-created vm-snapshot branch based on 4.0 branch and submitted refactorred codes
with KVM support.
Now the major parts have been done, and because this touches CS core, I would like to welcome
any suggestion, design/code review, tests and feedbacks of all forms.

For a complete updated spec/design document, please see

[Progress] (tested with simple scenario) Xenserver Free/Enterprise support VMware support
KVM support UI 

Resource Limit
VM snapshot allocation size stat

[How to test]
1.please notice KVM needs a modified libvirt.jar (thanks Wido for providing it), to make KVM
VM snapshot work properly, it is required to replace the old libvirt-0.4.9.jar with this one. test VMware support, apply Rohit’s 4.0 nonoss patch before compile/build

3.use Ant/Maven to build/debug, same with 4.0.

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