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• If the host should always run as Xen host, run YaST System > Boot Loader and
activate the Xen boot entry as default boot section.
• In YaST, click System > Boot Loader.
• Change the default boot to the Xen label, then click Set as Default.
• Click Finish.
• Close Virtual Machine Manager if you are not actively using it and restart it when
needed. Closing Virtual Machine Manager does not affect the state of virtual ma-
chines.
• For best performance, only the applications and processes required for virtualization
should be installed on the virtual machine host.
• When using both, iSCSI and OCFS2 to host Xen images, the latency required for
OCFS2 default timeouts in SP2 may not be met. To reconfigure this timeout, run
/etc/init.d/o2cb configure or edit O2CB_HEARTBEAT_THRESHOLD
in the system configuration.
2.2 Managing Domain0 Memory
When the host is set up, a percentage of system memory is reserved for the hypervisor,
and all remaining memory is automatically allocated to Domain0.
A better solution is to set a default amount of memory for Domain0, so the memory
can be allocated appropriately to the hypervisor. An adequate amount would be 20
percent of the total system memory up to 2 GB. An appropriate minimum amount would
be 512 MB.
2.2.1 Setting a Maximum Amount of
Memory
1 Determine the amount of memory to set for Domain0.
Setting Up a Virtual Machine Host
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