Re: [Xen-users] Can not attach vhd image and start vhd-based domU

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2015-05-15 at 21:55 +0300, Andrey wrote:
> > For debugging it can be useful to do "xl -N block-attach 0 <diskspec>",
> > this is just a dry-run block attach to dom0, which will print the parsed
> > version of the spec
> 
> Big thanks for the hints. Strange but I get the error while trying to 
> run xl block-attach 0 
> format=vhd,vdev=xvda,access=w,backendtype=tap,target=/home/data/centos-6.vhd 
> :
> 
> libxl: error: libxl_device.c:289:libxl__device_disk_set_backend: no 
> suitable backend for disk xvda
> libxl: error: libxl.c:1727:device_addrm_aocomplete: unable to (null) device
> libxl_device_disk_add failed.

You've trimmed the logs which would confirm, but I expect that libxl has
determined somehow that your systems doesn't have blktap support
enabled.

It might be missing at compile time from the toolstack or the kernel
module might be missing at runtime, or something else...


> 
> xl -N produces correct parsing:
> 
> disk: {
>      "backend_domid": 0,
>      "backend_domname": null,
>      "pdev_path": "/home/data/centos-6.vhd",
>      "vdev": "xvda",
>      "backend": "tap",
>      "format": "vhd",
>      "script": null,
>      "removable": 0,
>      "readwrite": 1,
>      "is_cdrom": 0
> }
> 
> >
> > Ian.
> >
> >



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