On Sat, Oct 24, 2015 at 05:21:01PM +0800, Dave Young wrote: > * block device > For block storage migration, the problem is similar as memory. The original > migration does not consider storage usage ratio it just copy all the sectors.
This is equivalent to issuing discard requests. File systems can already do that. The block/mirror.c code checks if sectors are allocated so this should be possible to achieve this today (with guest cooperation). Stefan
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