On Wed, 20 Jan 2016 18:28:33 +0100 Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > >> Also, can you find the value of the "FUA" file in sysfs (e.g. > >> with "cat /sys/block/sda/device/scsi_disk/*/FUA")? > > > > It is 0 both in IDE and SCSI modes. > > And in the host? On the host the backing block device for the host filesystem is an MD RAID6, it does not have the FUA setting. For the actual sdX disks, it's all 0 as well. As I said this might be not KVM-specific, but rather a Btrfs-only related issue. That KVM with IDE doesn't show the problem, might be a coincidence since as you mentioned it doesn't load the disks as heavily. If you're interested in my reproducer outside of KVM, I started a new thread: http://permalink.gmane.org/gmane.comp.file-systems.btrfs/52369 -- With respect, Roman
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