Sep 20, 2010

Migrating Redhat XEN Virtual Machine to VMware 1.x

Migrating Redhat XEN Virtual Machine to VMware 1.x


RedHat Enterprise Linux

VMware 1.x


Migrating Redhat Xen virtual machine to VMware Server 1.x


Note: Only “Fully Virtualized” Xen virtual machines are able to be migrated to VMware

Configuration changes to be done on Xen virtual machine:

1) Modify /etc/modprobe.conf to add the proper SCSI and network card modules which are configured in Vmware Server.

# vi /etc/modprobe.conf

alias eth0 pcnet32

alias scsi_hostadapter mptbase

alias scsi_hostadapter1 mptspi

alias scsi_hostadapter2 ata_piix

Note: Once modified the kernel modules, you won’t be able to properly start the machine, and you will receive a Kernel panic error message.

Convert VM migration disk:

          To convert a XEN machine in a .vmdk format to be used with VMware, a tool called qemu will be used. QEMU is a generic and open source machine emulator and virtualizer. It is also a fast processor emulator using dynamic translation to achieve good emulation speed.

2) Download qemu from the below link

3) Install the downloaded RPM

# rpm –ivh qemu-0.12.4-1.el5.rf.i386.rpm

4) Convert the XEN machine disk to VMware disk

# qemu-img convert -O vmdk

5) Now we have a valid VMware Server 1.xx disk device file. This can be added on onto any VMware Server.

6) Create a new virtual machine. Under Hard disk configuration, select “use existing hard disk”.

Note: If the storage controller and network controllers are not integrated in /etc/modprobe.conf, system might refuse to boot. Hence, it is mandatory to add necessary links to driver modules.

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