Re: [libvirt] virDomainAttachDevice error during disk hotplug

On Fri, Aug 16, 2013 at 03:48:25PM -0500, Doug Goldstein wrote: > 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. Oh, yes, good one. I really wish QEMU would provide a better error message for this case, since people hit it all the time

Daniel