Re: [SOLVED] virDomainAttachDevice error during disk hotplug

Deepak C Shetty <deepakcs@xxxxxxxxxxxxxxxxxx> · Sun, 18 Aug 2013 12:00:29 +0530



    On 08/17/2013 02:18 AM, Doug Goldstein
      wrote:

    
        On Fri, Aug 16, 2013 at 8:30 AM, Daniel
          P. Berrange <berrange@xxxxxxxxxx>
          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.
          
        
    Bingo!!!

    Thanks Doug.. thats probably the right reason. Moving the file to a
    diff dir thats not on tmpfs works!

    I was abt to start debugging from qemu perspective, but now i think
    thats not needed.

    I wish i had thot abt this earlier... would have saved fews days for
    me! 

    
    thanx,

    deepak

    
          -- 

          Doug Goldstein
        
      
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