On 20/01/2016 19:46, Roman Mamedov wrote: > 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 Oh that's great. Indeed the "info status" output would have pointed at an ENOSPC. It's definitely not KVM specific. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
