Re: [Xen-users] blktap2 and qcow2 images

[Sebastian Unger <sebunger44@xxxxxxxxx>]

So basically xen only supports physical devices and plain image files as disk back- ends?! To use snapshots one has to use LVM?

That seems pretty thin for something that I thought was a production quality virtualization solution.

A well, I guess I'll go back to virtualbox then.

Thanks for your help Thanos.

Cheers,
Seb

On 14/05/2013 9:06 PM, "Thanos Makatos" <thanos.makatos@xxxxxxxxxx> wrote:

> Mhmm, I've run a quick test, but it doesn't work with qcow either.
> Although the error is slightly different:
> tap-ctl: tap-err:tap_ctl_open: open failed, err -38 Do you know what
> that error (-38) means?

38 stands for ENOSYS (you can consult /usr/include/asm-generic/errno-base.h and /usr/include/asm-generic/errno.h for translating error codes). It means that something is not implemented, maybe support for qcow..

> Out of curiosity, does qcow support in-file snapshots like qcow2?

No idea.

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