VMs are pausing with ENOSPC

["Brian J. Murrell" <brian@interlinx.bc.ca>]

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On RHEL 6.4 I have a number of kvms using qemu raw disks.  They are all
on a filesystem which has reached 500G (of 1TB) of usage.  None of the
qemu images are full as reported by qemu-img info.  Yet my VMs are all
pausing with:

block I/O error in device 'drive-virtio-disk0': No space left on device (28)

in their logs
i.e.: # qemu-img info /var/lib/libvirt/images/mgmt1-disk0 
image: /var/lib/libvirt/images/mgmt1-disk0
file format: raw
virtual size: 120G (128849018880 bytes)
disk size: 52G

and:

# df -h /var/lib/libvirt/images/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_00-virt--images 1.0T 500G 473G 52% /var/lib/libvirt/images

Any ideas?

Cheers,
b.


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