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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] [PATCH 1/3] block: allow migration to work with image files |
Date: | Sun, 12 Sep 2010 08:06:50 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100826 Lightning/1.0b1 Thunderbird/3.0.7 |
On 09/12/2010 05:37 AM, Avi Kivity wrote:
On 09/11/2010 05:04 PM, Anthony Liguori wrote:Image files have two types of data: immutable data that describes things like image size, backing files, etc. and mutable data that includes offset andreference count tables.Note: even the logical size is, in principle, mutable. If we introduce external snapshots, then so are backing files?
Maybe it should be, "data the can be changed during a live migration". Backing files and logical size shouldn't change during live migration.But even so, I think the interface make sense. It's basically, drop anything you have cached that may change during migration. What needs to be read is dependent on features/format.
Regards, Anthony Liguori
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