[CentOS-virt] Xen on Centos 5.5 vs 5.3 and stability issues

Steven Ellis mail_lists at stevencherie.net
Wed Oct 27 20:56:33 EDT 2010

 I've recently upgraded a Centos 5.3 machine to Centos 5.5. The
hardware isn't HVM capabile so I'm only running para-virt guests.   

 Using a vanilla i386 kernel boots without, but the newer kernel-xen
locks up the Dom0 after a couple of minute. I'm only booting into
single user mode for these tests so no VMs are active.  

 	*kernel-xen-2.6.18-128.1.10.el5 - no issues 
	*kernel-xen-2.6.18-194.17.4.el5 - lock up 
	*kernel-2.6.18-194.17.4.el5 - no issues  
 For the moment I've switched back to the older Xen kernel, athough
I'm still running the newer Xen Hypervisor.
 My current Xen packages are  

 	*xen-3.0.3-105.el5_5.5 	*kernel-xen-2.6.18-194.17.4.el5
	*kernel-xen-2.6.18-128.1.10.el5 	*kmod-xfs-xen-0.4-2
	*xen-libs-3.0.3-105.el5_5.5 	*kernel-xen-devel-2.6.18-194.17.4.el5
	*kernel-xen-devel-2.6.18-128.1.10.el5 	*xen-devel-3.0.3-105.el5_5.5 
 Prior to the upgrade I had the following installed under Centos 5.3 

	*kernel-xen-2.6.18-128.1.10.el5 	*xen-libs-3.0.3-80.el5_3.2
	*xen-devel-3.0.3-80.el5_3.2 	*kmod-xfs-xen-0.4-2
	*kernel-xen-devel-2.6.18-128.1.10.el5 	*xen-3.0.3-80.el5_3.2 
 Booting Dom0 with kernel-xen-2.6.18-128.1.10.el5 everything appears
to work normally and all of my Guests are up and running.  

 If I boot with  kernel-xen-2.6.18-194.17.4.el5 the boot normally
gets to around udev and the system locks up. On a couple of occasions
it did mange to boot but reported some files were corrupted. I'm
worried that there is an issue running this kernel where the root
file system is LVM on top of Raid 1.  

 Anyone on this list have tips on diagnosing the issue, or come
across a similar problem themselves.  

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