In the KVM case define your backing store as non-cached:
<disk type='block' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source dev='/dev/XXX'/>
<target dev='vda' bus='virtio'/>
</disk>
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https://bugs.launchpad.net/bugs/341310
Title:
JBD: barrier-based sync failed on dm-0:8 disabling barriers
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