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

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Alain Barthe wrote:
> 2008/8/20 Alain Barthe <ab266061@xxxxxxxxx <mailto:ab266061@xxxxxxxxx>>
>
>     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
>     (...)
>
> Thanks for the information, Sadique.
>
> Concerning my problem, I tried to save the domU from a dom0 to a 
> shared location, then restore it on the other dom0. I have exactly the 
> same behaviour, same error.
I don't have any idea about these problems. Ideally you should be able 
to migrate back to lower minor versions provided that the major version 
remains the same. ie, 5.2 -> 5.0.
I am just wondering what is preventing you from updating/upgrading the 
COS 5.0 system directly to 5.2 as vendors of these operating systems 
provide 99% guarantee not to break anything through such updates.
--Sadique

> Should I understand that the way the memory is saved on COS 5.0 is not 
> compatible with the one on COS5.2 ?
> Thanks for your replies.
>
> Alain.
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