Re: [Xen-users] Xen and QCOW problems

[Grant McWilliams <grantmasterflash@xxxxxxxxx>]

On Sun, Jan 3, 2010 at 5:58 PM, J Nb <j_nwb@xxxxxxxxx> wrote:

Hi
  I am trying to use qcow2 disks. Environment is SLES 10 SP2 dom0 and tried Ubuntu and CentOS domUs.

Initially used qemu-img to create disks .. but did not work. The installer did not recognize any disks.

Then ran in to the following article that suggested to use qcow-create and the PV VM started. But is very... slow. It took more than 30 min to format 5G. And installation is going over 10 hrs. now.!

For HVM vm, The partitioning dialog does not show any disks! The disk entry is as follows.


disk=['tap:qcow:/mnt/storage/vm_disks/hvm_qcow.qcow,xvda,w', 'file:/mnt/storage/iso/CentOS-5.4-x86_64-bin-DVD.iso,hdc:cdrom,r']


Tried tap:qcow, file as protocol and xvda, hda as disks but nothing seem to work.

Any ideas ?
Is anyone using qcow2 format their daily use ? or in production ?
I am trying to standardize on this so I can take snapshots.
Any help is appreciated.

-nb

No matter what the documentation says Qcow/Qcow2 doesn't really work in Xen. Even if you manage to get it to boot of an image there's no backing store support so why use it? I wish they'd either fix it or remove any reference to tap:qcow so some of us don't waste weeks googleing and testing to try to get it functional.


Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows." 
Now they have two problems.
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