Another question about the Storage Live Migration wiki page, in the Engine-VDSM flow:

 domain1: [base(raw)]<-[snap1(qcow2)]<-+-(VM)
 domain2:                              +-[snap2(qcow2)]

 domain1: [base(raw)]<-[snap1(qcow2)]<-+
 domain2:                              +-[snap2(qcow2)]<-(VM)

I think there must have a storage quiesce time between the snap2 creation and 
setting the VM on top of snap2.
When the snap2 is being created, VM cannot access snap1. Only after VM is set 
on top of snap2, the quiesce period is end.

On 2012-2-7 4:34, Federico Simoncelli wrote:
During my endless journey back from FOSDEM (24 hours stuck in airports,
taxi and trains because of one of the largest blizzards in Italy ever),
I've been briefly working on the design for both live merge and storage
live migration:

They're far for being complete but I'm not able to do anything better

Please review if you're interested, the general idea should be correct
even though there are several unfinished parts.

Shu Ming<>
IBM China Systems and Technology Laboratory

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