Novell SUSE LINUX ENTERPRISE DESKTOP 11 SP1 - 8-18-2010 VIRTUALIZATION WITH ZEN Manual page 52

(xend-relocation-server yes)
(xend-relocation-port 8002)
(xend-relocation-hosts-allow '^localhost$ ^localhost\\.localdomain$ \
^<relocation_host>')
These changes must be done on all VM Host Server systems that should participate in
migrating guests.
5.6.2 Preparing Block Devices for Migrations
The block devices needed by the VM Guest system must be available on all involved
VM Host Server systems. This is done by implementing some kind of shared storage
that serves as container for the root file system of the migrated VM Guest system.
Common possibilities include:
• iSCSI can be set up to give access to the same block devices from different systems
at the same time. For more information about iSCSI, see
.com/documentation/sles11/stor_admin/data/cha_inst_system
_iscsi.html.
• NFS is a widely used root file system that can easily be accessed from different
locations.
• DRBD can be used, if only two VM Host Server systems are involved. This gives
some extra data security, because the used data is mirrored over the network. For
more information, see
sles11/book_sleha/data/cha_ha_drbd.html.
• SCSI can also be used, if the available hardware permits shared access to the same
disks.
• NPIV is a special mode to use fibre channel disks. However, in this case all migra-
tion hosts must be attached to the same fibre channel switch. For more information
about NPIV, see Section 7.1, "Mapping Physical Storage to Virtual Disks"
(page 59). Commonly, this works if the fibre channel environment supports 4 GBit
or faster connections.
42 Virtualization with Xen
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