[libvirt] [SOLVED] virDomainAttachDevice error during disk hotplug

[Deepak C Shetty]

On 08/17/2013 02:18 AM, Doug Goldstein wrote:
> On Fri, Aug 16, 2013 at 8:30 AM, Daniel P. Berrange 
> <berrange at redhat.com <mailto: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.

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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