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

Steven Ellis mail_lists at stevencherie.net
Wed Oct 27 23:41:28 EDT 2010

 Raid 1 is mdadm software raid  

 Disk layout on /dev/hd[ab] is  

 md0 = /boot  

 md2 = swap  

 md1 = LVM  

 The root filesystem for dom0 is in LVM along with the root and swap
file systems for a number of guests  
 I currently use pygrub to boot most of the guests. As I said the
guests arent the issue, my Dom0 instance hangs with the most recent
 On Wed, 27 Oct 2010 19:26:29 -0700, Eric Searcy  wrote:    Curious,
RAID1 is soft/md, fakeraid or hardware?   
   Also, are you using pygrub and then what is the kernel for the
guests, or are you using a kernel from the host/which one?   
   (I'm using almost-latest, ie last week, kernel on host and guest
(pygrub) on hardware raid, haven't had any issues to date.)   
   Sent from my iPhone.  Pardon the top-posting!    
 On Oct 27, 2010, at 5:56 PM, Steven Ellis  wrote:
 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.  

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
	*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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