[Linuxppc-users] Live VM disk removal failure

[Leonardo Augusto Guimarães Garcia]

Samuel,

>From what you described, it doesn't seem to me, at least initially, that
you have an issue in libvirt. On Power systems, you need some user space
tools installed in the guest in order to correctly perform hot plug and
hot unplug operations. It may be the case that the tools that come
installed by default in Ubuntu 14.04 and Ubuntu 16.04 are just too old.
Please, check the versions of the following packages:powerpc-utils,
ppc64_diag, and librtas.

Cheers,

Leo

On 06/28/2017 05:24 PM, Samuel D Matzek wrote:
> I am hitting a silent error while trying to detach a volume from a
> running VM on Ubuntu Xenial KVM.  While I am using OpenStack for this,
> the OpenStack code is calling into the libvirt module to do the detach
> from the transient / live domain and libvirt is failing to remove the
> disk from the running domain and is not putting any errors in libvirtd
> logs.
> The OpenStack error is "DeviceDetachFailed: Device detach failed for
> vdb: Unable to detach from guest transient domain."
>  
> I have discovered this is a guest OS issue.  I tried the following
> guest OSes with Ubuntu Xenial as the host OS:
>  
> Silent detach failure / fail to detach:
> Ubuntu 14.04 ppc64le daily build of Ubuntu cloud image
> Ubuntu 16.04 ppc64le daily build of Ubuntu cloud image
>  
> Live detach succeeds:
> Ubuntu 16.10 ppc64le daily build of Ubuntu cloud image
> Ubuntu 17.04 ppc64le daily build of Ubuntu cloud image
> CentOS 7.3
>  
> What I am trying to achieve is to get the live detach to work on
> Xenial (16.04) and am at a loss as to what packages or processes may
> be involved in the differences between 16.04 and 16.10 where it works.
>  I have checked the kernel and both 16.04 and 16.10 are both using a
> 4.8.x level.
>  
> In all cases the disk trying to be detached is not in use.  They are
> blank with no file system on them.  They are not mounted.  The same
> set of steps is taken to attach, reboot, detach, between the working
> and non-working OS levels above.
>  
> Does any one have hints on what could be causing the silent detach
> failure on Xenial?  What packages I should look at updating beyond
> what the Ubuntu daily build has?  Note I have already tried doing
> upgrade of all packages, including updating from a recent UCA repo.
>  
> Additionally, does anyone know what to set (and where) to get the
> reason libvirt is not detaching the volume from the live domain? I
> have already tried enabling the logging documented here [1].
> [1] https://wiki.libvirt.org/page/DebugLogs
>
>
>
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