[Xen-users] Old 32 bits domU on new 64 bits dom0

["Alain Barthe" <ab266061@xxxxxxxxx>]

Hello all,

We run since several month various domU (RH like, from 2.6.9 to 2.6.18, all 32 bits) on CentOS 5.0 dom0 32 bits.
We are upgrading our dom0 to CentOS 5.2 64 bits. For modern domU (2.6.18 32 bits), no problem at all.

For old domU (2.6.9), no luck, they don't start with an error message related to vbd that are not found. Google said me it is a kernel version related problem. So I upgraded my domU through yum to install the kernel-xenU#2.6.9-67.0.22.EL in place of the existing one kernel-xenU#2.6.9-55.EL. Yes. It works. Fine !

Now I am trying to live migrate such domU. No luck : the domU desappears from both sides, and xend dies on the from dom0. The error message is similar to the one I got before, so I suppose it's a kernel version problem again.

So I let down pygrub and I configure my domU to use the dom0 kernel and ramdisk (64 bits !). Then my domU starts and can be migrated normally. Everything looks like working (except this damn nash-hotplug process that eats all the CPU at startup and that I have encoutered earlier).

My question is : is such a setup is safe ? (a newest 64 bits xen kernel with an old 32 bits OS). Is there another lighter way to fix the problem ?

Thanks for your answer.

Alain.

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