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

To: Alain Barthe <ab266061@xxxxxxxxx>
Subject: Re: [Xen-users] Re: Upgrading xen from CentOS 5.0 to 5.2
From: Sadique Puthen <sputhenp@xxxxxxxxxx>
Date: Wed, 20 Aug 2008 23:42:05 +0530
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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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