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Re: [Qemu-devel] Re: Strategic decision: COW format

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] Re: Strategic decision: COW format
Date: Mon, 14 Mar 2011 14:26:27 +0000

On Mon, Mar 14, 2011 at 1:53 PM, Chunqiang Tang <address@hidden> wrote:
> Therefore, during normal execution of a
> VM, images with snapshots are as fast as images without snapshot.

Hang on, an image with a snapshot still needs to do copy-on-write,
just like backing files.  The cost of copy-on-write is reading data
from the backing file, whereas a non-CoW write doesn't need to do

So no, snapshots are not free during normal execution.


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