On 09/10/2010 04:16 PM, Anthony Liguori wrote:
btw, despite being not properly designed, qcow2 is able to support
TRIM. qed isn't able to, except by leaking clusters on shutdown.
TRIM support is required unless you're okay with the image growing
until it is no longer sparse (the lack of TRIM support in guests make
sparse image formats somewhat of a joke, but nobody seems to notice).
It's actually pretty easy in QED and it should perform very well.
http://wiki.qemu.org/Features/QED/Trim
If you don't add a free list, this is a pretty bad implementation. If
you do, you're back to qcow2's problems.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
