Re: [Xen-users] attach an iso file to a PV guest

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-07-31 at 17:17 +0200, Maarten Vanraes wrote:
> Op woensdag 31 juli 2013 15:36:39 schreef Ian Campbell:
> > On Wed, 2013-07-31 at 16:20 +0200, Maarten Vanraes wrote:
> > > i'm using the xl tools and i want to attach an iso file to a PV.
> > 
> > Which version of Xen and what does your guest config file contain?
> > 
> > Please can you provide the result of attempting "xl -vvv create $cfg" with
> > your $cfg
> 
> thanks to your suggestion to use -vvv i can now see more on what's going on...
> 
> this is xen 4.2.2 using the centos repository with kernel: 
> 3.4.46-8.el6.centos.alt.x86_64
> 
> 
> what didn't work:
> [ ]# xl -vvv block-attach templ-sl6 
> format=raw,vdev=hdb,access=ro,backendtype=tap,devtype=cdrom,target=/path/to/SL-64.iso
> 
> output:
> -----------
> libxl: debug: libxl.c:3211:libxl_device_disk_add: ao 0x1a09a40: create: 
> how=(nil) callback=(nil) poller=0x1a09aa0
> libxl: debug: libxl_device.c:245:libxl__device_disk_set_backend: Disk 
> vdev=hdb 
> spec.backend=tap
> DEBUG libxl__blktap_devpath 37 aio:/etc/xen/isos/ScientificLinux/SL-64-
> x86_64-2013-03-18-Install-DVD.iso
> libxl: error: libxl.c:1866:device_disk_add: failed to get blktap devpath for 
> 0x1a09bf0

Weird. There were some oddities with cdrom and/or blktap in 4.2, which
may be improved in 4.3.

Can you try without the backendtype=tap bit (just say nothing). I hope
this will cause libxl to automatically pick something which actually
works.

Unless you know you have some specific requirement for blktap this is
good advice in general.

Ian.


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users