Re: [Xen-users] Dell 2650

[David Brain <dbrain@xxxxxxxxxxxxx>]

A follow up in the interests of completeness and putting some info in 
the archive.
I now have it working - disabled the USB, modified kernel config as 
suggested below.  Also found that having SMP enabled Dom0 kernel caused 
problems (occasional boot lockups) so run non SMP.  Interestingly the 
DomU kernels _HAVE_ to be SMP or they fail to find the root device (no 
idea why that is).
Config I used for Gentoo:

Set RC_NET_STRICT_CHECKING="none" in /etc/conf.d/rc.d

/etc/conf.d/net:

bridge_xenbr0="eth0"
config_xenbr0=( "10.1.53.75 netmask 255.255.255.0 broadcast 10.1.53.255" )
routes_xenbr0=("default via 10.1.53.1")

Then add xenbr0 to the default run level.

System is now up and running well. Have one issue in that xm top (or 
xentop) gives me a segmentation fault, but that's not a big problem.
Thanks for the assistance.


Ernst Bachmann wrote:
> On Friday 11 November 2005 20:15, David Brain wrote:
>
> > I'm having some problems getting a Xen Dom0 running on a Dell Powedge
> > 2650.  I'm using xen 3.0.0_pre20051027 with 2.6.12 patched xen sources.
> >
> > Problem is that it detects the SCSI controller, but the driver does not
> > initialize the disks.
> >
> > The controller is an Adaptec AIC-7899P
> >
> > [from lspci]
> > 0000:05:06.0 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)
> > 0000:05:06.1 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)
> >
> > Works under plain linux using the 'Adaptec AIC7xxx Fast -> U160 (new
> > driver)'.
> >
> > Under xen the boot never progresses past:
> >
> > scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
> >         <Adaptec aic7899 Ultra160 SCSI adapter>
> >         aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
> >
> > Then does not detect the discs, and sits cyling scsi resets.
> >
> > I also tried the old AIC7 driver with similar results.
> >
> > Any thoughts as to how to progress (or kernel config hints)..
>
> Could you check /proc/interrupts wether the IRQ is shared with some other 
> device, maybe the USB controller?
> There were quite some reports of dell hardware causing trouble unless you 
> deactivate USB in the bios, maybe try that.
> About the kernel config: I had a similar problem with a xen-3 snapshot, the 
> SCSI controller (LSI Megaraid) wouldn't receive interrupts and cycle through 
> scsi resets in an endless loop.
> (uniprocessor kernel for dom0 on a dual Xeon system with HT)
>
> I disabled "PCI Express support" and "Message Signaled Interrupts (MSI and 
> MSI-X)"  and enabled "Local APIC support on uniprocessors" + "IO-APIC support 
> on uniprocessors" in "Bus options (PCI, PCMCIA, EISA, MCA, ISA)" under "X86 
> Processor Configuration" which caused it to work again.
> Unfortunately I didn't bother to check which of those four options acutally 
> fixed it, but my guess would be the IO-APIC (the board doesn't have PCI 
> Express)...
> /Ernst

--
David Brain  -  Bandwidth.com
mailto:dbrain@xxxxxxxxxxxxx
(919) 297 1078

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