Thanks a lot for your reply.
> From: Keqin Hong [khong@xxxxxxxxxx]
> Sent: 10 November 2010 01:56
> To: Prasad Joshi
> Subject: Re: Unable to start VM using COWed image
> ----- "Prasad Joshi" <P.G.Joshi@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Hello,
>
> I am trying to run KVM machine from the image created as COW from the
> original image. But it not working.
>
> Screenshot that shows the KVM works with the original image
>
> [root@prasad images]# qemu-kvm /var/lib/libvirt/images/Ubuntu.img -m
> 512
> ^Z
> [1]+ Stopped qemu-kvm
> /var/lib/libvirt/images/Ubuntu.img -m 512
> [root@prasad images]# bg
> [1]+ qemu-kvm /var/lib/libvirt/images/Ubuntu.img -m 512 &
> [root@prasad images]# pwd
> /var/lib/libvirt/images
> [root@prasad images]# lsmod | grep -i kvm
> kvm_intel 42122 3
> kvm 257132 1 kvm_intel
>
> 1. Created COW copy of the image after stoping the VM that was
> running
>
> [root@prasad images]# pwd
> /var/lib/libvirt/images
>
> [root@prasad images]# qemu-img create -b Ubuntu.img -f qcow
> /home/prasad/Virtual/Ubuntu_copy.ovl
> try adding "-F base-fmt". Also qcow is obsolete, you'd better use qcow2
> e.g. qemu-img create -b Ubuntu.img -F raw -f qcow2 /home/prasad/Virtual/Ubuntu_copy.ovl
[root@prasad images]# pwd
/var/lib/libvirt/images
[root@prasad images]# date; qemu-img create -b Ubuntu.img -F raw -f qcow2 /home/prasad/Virtual/Ubuntu_copy.ovl
Wed Nov 10 09:44:31 GMT 2010
Formatting '/home/prasad/Virtual/Ubuntu_copy.ovl', fmt=qcow2 size=8589934592 backing_file='Ubuntu.img' backing_fmt='raw' encryption=off cluster_size=0
[prasad@prasad Virtual]$ ls -l
total 136
-rw-r--r--. 1 root root 262144 Nov 10 09:44 Ubuntu_copy.ovl
[prasad@prasad Virtual]$ sudo qemu-kvm ${PWD}/Ubuntu_copy.ovl -m 512
qemu: could not open disk image /home/prasad/Virtual/Ubuntu_copy.ovl: No such file or directory
[prasad@prasad Virtual]$ sudo qemu-kvm Ubuntu_copy.ovl -m 512
qemu: could not open disk image Ubuntu_copy.ovl: No such file or directory
[prasad@prasad Virtual]$ sudo qemu-kvm ./Ubuntu_copy.ovl -m 512
qemu: could not open disk image ./Ubuntu_copy.ovl: No such file or directory
>
> 2. Trying to run VM using the copy created
>
> [prasad@prasad Virtual]$ ls -l
> total 36
> -rw-r--r--. 1 root root 32832 Nov 9 15:33 Ubuntu_copy.ovl
>
> [prasad@prasad Virtual]$ qemu-kvm Ubuntu_copy.ovl -m 512
> qemu: could not open disk image Ubuntu_copy.ovl: Permission denied
>
> [prasad@prasad Virtual]$ sudo qemu-kvm Ubuntu_copy.ovl -m 512
> qemu: could not open disk image Ubuntu_copy.ovl: No such file or
> directory
something like this may help:
qemu -drive file=$file,index=0,media=disk,format=qcow2
>
> [prasad@prasad Virtual]$ sudo qemu-kvm ./Ubuntu_copy.ovl -m 512
> qemu: could not open disk image ./Ubuntu_copy.ovl: No such file or
> directory
>
> [prasad@prasad Virtual]$ qemu-kvm ${PWD}/Ubuntu_copy.ovl -m 512
> qemu: could not open disk image /home/prasad/Virtual/Ubuntu_copy.ovl:
> Permission denied
>
> [prasad@prasad Virtual]$ sudo qemu-kvm ${PWD}/Ubuntu_copy.ovl -m 512
> qemu: could not open disk image /home/prasad/Virtual/Ubuntu_copy.ovl:
> No such file or directory
>
> Why is it failing?
>
> Thanks and Regards,
> Prasad Joshi
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