On Tue, 19 Jan 2016 16:19:44 -0800 Liu Bo <bo.li.liu@xxxxxxxxxx> wrote: > What about 'btrfs fi df' 's output on the directory where $NAME.img is > located? $ sudo btrfs fi df . Data, single: total=8.59TiB, used=8.47TiB System, DUP: total=32.00MiB, used=624.00KiB Metadata, DUP: total=13.00GiB, used=9.87GiB GlobalReserve, single: total=512.00MiB, used=0.00B $ df -h . Filesystem Size Used Avail Use% Mounted on - 9.1T 8.5T 571G 94% /mnt/r5/vm The guest VM disk itself is 8 GB in size. > According to my experience, kvm guest can be 'no response' when no space > on the backend's filesystem, but you said that the alternative way > work, so it doesn't look like a no space issue. I don't get any ENOSPC errors on the host, also it doesn't seem to be a slowdown caused by disk I/O searching for free space, just a complete lock-up: I monitor the guest with 'ping', and when it happens, the ping responses stop immediately and do not return, also there is no reaction to any keypress in the KVM VNC window. -- With respect, Roman
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