Re: [libvirt] virDomainAttachDevice error during disk hotplug

On Fri, Aug 16, 2013 at 8:30 AM, Daniel P. Berrange <berrange(a)redhat.com&gt;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.