[CentOS] Quation about CentOS 4 xenU kernel

Fri Aug 1 14:29:46 UTC 2008
Kai Schaetzl <maillists at conactive.com>

I converted a physical maschine running CentOS 4.6 to a Xen VM on a CentOS 
5 host. Almost everything was running when I decided to rsync /lib and 
/usr a while later in order to get updated files and get the one or two 
non-working programs to work. There are differences because of the xenU 
kernel I didn't think about. I forgot to exclude rpm database and 
Because the synced rpm database doesn't include the xenU kernel anymore I 
installed the latest one again. I got this warning:

WARNING: No module ata_piix found for kernel 2.6.9-67.0.22.ELxenU, 
continuing anyway

Looking around I don't have this module for the old kernel (2.6.9-67) 
either. But it's referenced in modprobe.conf. Nevertheless, I could boot 
the VM. A locate shows this module in all non-xenU kernels under 
/lib/modules, sometimes in a scsi, sometimes in an ata subdirectory. I 
still have a backup of the old setup before the sync and this doesn't 
contain ata_piix in /lib/modules/2.6.9-67.ELxenU/kernel/drivers/scsi 
either. And no ata directory.

So, I'm a bit puzzled now. Do I need that module to boot a Xen VM? If not, 
why is it modprobed? And why do I get this warning from the xenU kernel?


Kai Schätzl, Berlin, Germany
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