• Minimum 3 XS hosts
• Shared Storage
• Resource Pool
• Static IP address for all Xenserver hosts
• Advanced edition or higher
• VMs connected to pool-wide networks
• VMs not connected to any XS host DVD drive configuration
• All VM virtual disks on shared storage accessible pool-wide
• 4 MB heartbeat volume
• 256 MB metadata volume    -stores pool master metadata
• use bonded management interface

VM Restart Priority:

• HA restart priority -Restart -Restart if possible -Do not restart

• Start order

• Attempt to start next VM after