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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 Domain 0 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 minimum and maximum amount of memory for domain 0,
so the memory can be allocated appropriately to the hypervisor. An adequate maximum
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 domain 0.
2 At Domain0, type xm list to view the currently allocated memory.
Setting Up a Virtual Machine Host
9
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