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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH 3/8] qed: add support for Copy-on-Read |
Date: | Wed, 27 Apr 2011 16:29:41 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.9 |
On 04/27/2011 03:27 PM, Stefan Hajnoczi wrote:
From: Anthony Liguori<address@hidden> When creating an image using qemu-img, just pass '-o copy_on_read' and then whenever QED reads from a backing file, it will write the block to the QED file after the read completes ensuring that you only fetch from the backing device once. This is very useful for streaming images over a slow connection.
While having the default in the file is sane, it seems to me that it should be overridable at runtime, too.
Paolo
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