KVM Image Jammed After Power Unplug

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http://serverfault.com – We have a HP DL380 Server which has ubuntu 12.04 OS as Host and for Virtualization KVM. Power of our server unplugged suddenly and after plugging power size of image of vm in */var/lib/libvirt/images/image.img* decreased from 100G to 1G and when vm power up following error occurred: error: unknown filesystem grub rescue> we had critical data on vm so what should we do ? (HowTos)