[Xen-users] Upgrading xen from CentOS 5.0 to 5.2

["Alain Barthe" <ab266061@xxxxxxxxx>]

Hi,

We are planning to upgrade our dom0s from CentOS5.0 to CentOS 5.2, using the xen version shipped with the OS : the RPM versions are respectively 3.0.3-25.el5 and 3.0.3-64.el5_2.1, I don't know exactly to which version of Xen it corresponds (but it should be further than 3.0.3, right ?). Kernel versions are resp. 2.6.18-8.el5xen and 2.6.18-92.el5xen.

As we want to avoid any interruption of service, domUs must be live migrated from the old version to the newer one, and also back if something wrong happens.

Live migration from 5.0 to 5.2 is OK, but not 5.2 to 5.0. In this case, all looks like fine on the from dom0, but the domU never appears on the target dom0, with the following error in the logs:

[2008-08-20 09:40:57 xend 23799] INFO (XendCheckpoint:239) Reloading memory pages:   0%
[2008-08-20 09:41:02 xend 23799] INFO (XendCheckpoint:239) Error when reading region pfn types: 14
[2008-08-20 09:41:02 xend 23799] INFO (XendCheckpoint:239) Restore exit with rc=1
(...)

I tried with a CentOS5.0 domU and a CentOS5.2 one : same result.

My question is: is it normal, or do I miss something ? Is there a way to make this working ?

Thanks for your replies.

Alain.

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