lldmka
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Enthusiast

Snapshot - why no memory pre copy?

Hi,

I'm wondering why a VM snapshot with memory state needs to stun a VM for so long (up to a minute for 4GB). Couldn't memory pre-copy be used, as it is in a vMotion?? ie. pre-copy the memory state to disk, while creating a memory bitmap for new changes... then progressively write the deltas to disk until there are a small number remaining, so that the VM would only need to be stunned for a couple of seconds.

Mark

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