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[Qemu-devel] Re: snapshot vs COW?

From: walt
Subject: [Qemu-devel] Re: snapshot vs COW?
Date: Sun, 14 Dec 2008 14:07:31 -0800
User-agent: Thunderbird/3.0a2pre (X11; 2008121407)

Thiemo Seufer wrote:
Jamie Lokier wrote:
walt wrote:
COW is a nice feature but it is currently broken, so don't use it
until it gets fixed.  When you commit any changes your backing file
will be corrupted.

Aieee!  I use COW instead of snapshots in my management scripts,
because snapshots are harder to manage.

Is the COW brokenness documented?  What version did it start being broken?

Cow2 is broken in the 0.9.1 release, it was fixed shortly afterwards.
The symptom was corruption of the image when it grew beyond 4 GB...

Glad to hear it, thanks for the update.  That means that the fix is
already in the kvm git repository?

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