Re: [Xen-users] Re: XEN 3.1: critical bug: vif init failure after creating 15-17 VMs (XENBUS: Timeout connecting to device: device/vif)

[Thomas Ronner <thomas@xxxxxxxx>]

Hi Keir,

Thanks for your quick reply!


Keir Fraser wrote:
> Hi Thomas,
>
> This problem is entirely different. The problem is visible earlier in your
> console output: the Xen block-device driver is unable to acquire the
> device-number space for SCSI devices (sda, sdb, etc). Hence it is failing to
> initialise the vbd connections to the backend and is ending up in state 6
> (which is XenbusStateClosed).
I don't understand. Which Xen block-device driver is unable to? The 
frontend or the backend? This never happened on Xen 2, al least I never 
encountered it.

> The solutions you have are:
>  1. Do not build the generic SCSI subsystem into your dom0 kernels. It is
> this subsystem which (quite reasonably) is allocating the sd* number space
> to the exclusion of the Xen block-device driver.
This is not possible, as the physical machine has SCSI-disks and a SATA 
disk (which also uses the SCSI subsystem).

>  2. Call your devices hd* instead of sd* (i.e., hijack the IDE device
> numbers instead of the SCSI ones), or even use the xvd* number space, which
> is exclusively reserved for Xen VBDs.
I tried hd*, which works. I'm used to making sd* devices as there used 
to be some Xen version (forgot which one) that was more stable when 
using sd* devices in domUs.

>  Hope this helps,
>  Keir
Thanks,
Thomas

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