Re: Working hotplug, but still timing out waiting for vbd device ("changing physical-device not supported"?)

[Charles Duffy <cduffy@spamcop.net>]

Ewan Mellor wrote:
> On Sun, Nov 13, 2005 at 11:37:06AM -0600, Charles Duffy wrote:
> 
>>changing physical-device not supported
> 
> Actually Charles, I've just noticed this in your earlier mail, and this
> suggests something a little more serious going on than I first thought
> (actually you might have two problems, so if you could still address the
> potential race, that would be good).

Yes; I'll get you feedback on the other item within the next few hours.

> Does this happen immediately after a reboot?

Let's see... I have it happening on the first DomU startups after one 
boot... and don't see it anywhere else in my logs, particularly 
including my more recent test boots.

On the occasion when it *did* happen (that's still covered in the 
available logs), logs were as follows:

Nov 12 15:03:34 demo-xen net.agent[8280]: add event not handled
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/block: bind 
XENBUS_PATH=backend/vbd/1/769
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/block: bind 
XENBUS_PATH=backend/vbd/1/770
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/block: Writing 
backend/vbd/1/770/physical-device 0xfd04 backend/vbd/1/770/node 
/dev/data/demo-1-swap to xenstore.
Nov 12 15:03:35 demo-xen changing physical-device not supported
Nov 12 15:03:35 demo-xen changing physical-device not supported
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/block: Writing 
backend/vbd/1/770/hotplug-status connected to xenstore.
Nov 12 15:03:35 demo-xen changing physical-device not supported
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/block: Writing 
backend/vbd/1/769/physical-device 0xfd03 backend/vbd/1/769/node 
/dev/data/demo-1 to xenstore.
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/vif-bridge: 
bridge=xenbr0 up XENBUS_PATH=backend/vif/1/0
Nov 12 15:03:35 demo-xen logger: /etc/xen/scripts/block: Writing 
backend/vbd/1/769/hotplug-status connected to xenstore.
Nov 12 15:03:35 demo-xen changing physical-device not supported
Nov 12 15:03:35 demo-xen changing physical-device not supported
Nov 12 15:03:35 demo-xen changing physical-device not supported

> Are you using NFS anywhere, say as your dom 0 root fs?

No NFS. My root is LVM over local drives only (and likewise, my DomUs' 
block devices all are phy: pointing at logical volumes).