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Native Linux KVM tool v2Native Linux KVM tool v2Posted Jun 15, 2011 22:21 UTC (Wed) by aliguori (subscriber, #30636)In reply to: Native Linux KVM tool v2 by aliguori Parent article: Native Linux KVM tool v2
It's worse than I initially thought :-( Writes are unstable but FLUSH isn't currently implemented. So even if a guest does send FLUSH commands correctly, native KVM tool ignores them...
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Native Linux KVM tool v2 Posted Jun 15, 2011 22:46 UTC (Wed) by aliguori (subscriber, #30636) [Link]
Nope, misread the code. It does do an fsync() on FLUSH so for guests that support barriers problem, it will work correctly.
So the behavior is equivalent to cache=writeback in QEMU.
Native Linux KVM tool v2 Posted Jun 16, 2011 6:35 UTC (Thu) by penberg (subscriber, #30234) [Link]
Yup, we worked pretty hard to make sure we don't eat your QCOW2 images for lunch :-).
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