[Xen-users] Re: Getting started with Xen

[Molle Bestefich <molle.bestefich@xxxxxxxxx>]

Jean-Michel Hiver wrote:
> In order to do this, I have ordered a dell poweredge 1850 bi-xeon, 4 gb
> ecc ram, and raid 1 SCSI disks. It also has dual power supplies and dual
> port network cards. The idea is to have redundancy wherever possible in
> order to lower the risk of server downtime.

> Also I would like to know if there are known issues with
> the hardware I have ordered.

The only hardware manufacturer which I can remember reading about
having problems with Xen recently on this list is Dell.  I think
there's a USB issue with Dell hardware, machines go locking up or
something like that.  Search the archives?

> Is it possible to "migrate" a virtual machine to a completely different
> PC (with different hardware specs)?

It needs to have the same CPU.

Maybe you can work around this by compiling your kernel to a CPU which
has a superset of the features of the individual CPUs you plan to use,
eg. i686.  All your executables would need to be compiled to target
this CPU too.

Different CPUs may still cause problems if you use code which has
sections written for a particular CPU and runtime autodetection of CPU
capabilities.  Linux MD comes to mind.

> That would be a very useful feature to have for upgradability.

If you're permanently upgrading then you're only going to do it once,
so there's probably less of a problem..

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