[libvirt] virDomainAttachDevice error during disk hotplug

[Doug Goldstein]

On Fri, Aug 16, 2013 at 8:30 AM, Daniel P. Berrange <berrange at redhat.com>wrote:

> On Fri, Aug 16, 2013 at 06:51:21PM +0530, Deepak C Shetty wrote:
> > On 08/10/2013 06:20 PM, Deepak C Shetty wrote:
> > >2013-08-10 11:19:41.772+0000: 1091: debug :
> > >qemuMonitorIOProcess:345 : QEMU_MONITOR_IO_PROCESS:
> > >mon=0x7f92f0007830 buf={"return": "could not open disk image
> > >/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399: Invalid
> > >argument\r\n", "id": "libvirt-67"}^M
> >
> > Any suggestions from anyone on why "Invalid Argument" is being returned ?
>
> QEMU's error reporting for disk configs is known to be worse than
> useless.  You can't infer anything useful from "Invalid Argument"
> I'm afraid.
>
>
I'm going to go out on a limb here and say its an O_DIRECT error. Reason
I'm guessing this is that O_DIRECT is not supported on tmpfs and when you
attempt to open() a file with O_DIRECT and its not supported you'll get
back -EINVAL from the kernel. Newer systems have /run as tmpfs and /var/run
symlinked to /run.

-- 
Doug Goldstein
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20130816/b3762163/attachment-0001.htm>