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Re: [Qemu-devel] [partial RFC 0/2] QCow2 deduplication write mechanism
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From: |
Avi Kivity |
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Subject: |
Re: [Qemu-devel] [partial RFC 0/2] QCow2 deduplication write mechanism |
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Date: |
Thu, 27 Sep 2012 17:58:11 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0 |
On 09/27/2012 04:29 PM, Benoît Canet wrote:
> This patchset introduce a partial implementation of a deduplication mechanism
> for QCow2.
> This patchset layout the disk format changes in the qcow2 spec and
> provide a partial implementation of the write mechanisms.
>
> Albeit being partial this is posted to get an early feedback and
> see if things are on track.
If I understood correctly, this does cluster-level dedup within a qcow2
image.
What is the motivation here? Reduce space usage if a guest copies files
internally?
Why use cluster granularity? If the guest uses smaller granularity, it
will misalign the data wrt cluster boundaries, and deduplication will fail.
--
error compiling committee.c: too many arguments to function