Designing High Availability Solutions with HP Serviceguard and HP Integrity Virtual Machines

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Downtime experienced:
• Complete VM guest downtime during the migration
Advantages:
• Allows copying of storage used by the VM guest from the VM host source to target
• Provides movement of VM guests that are not supported using online migration
Disadvantages:
• Complete downtime of the VM guest during the migration
Offline VM Migration with Serviceguard
Used for:
• Protecting VM guests from unplanned hardware and software failures (Note Serviceguard LAN failover and vswitch
monitor handle network failures without VM guest failover)
• Planned maintenance and static (manual) load balancing
Downtime experienced:
• 3 minutes or more (time to shutdown applications and guest OS, restart VM guest package, guest OS and
applications on adoptive VM host)
Advantages:
• Protects running VM guest against failures
• Allows for planned movement of workloads that cannot be migrated online due to VM host hardware or software
differences (for example, dissimilar processor families, use of non-whole disk backing storage, a source VM host
running a prior Integrity VM version that does not support online migration, etc.)
Disadvantages:
• Several minutes of application downtime will occur during the migration
Online VM Migration without Serviceguard
Used for:
• Planned downtime and manual workload balancing for VM hosts
Downtime experienced:
• Tens of seconds for system “freeze” time during the migration (depending on VM guest activity)
Advantages:
• Minimal application downtime during planned maintenance periods
Disadvantages:
• Provides no protection for the VM guest against unplanned VM host hardware/software failures or failure of the
VM guest itself
Online VM Migration with Serviceguard
Used for:
• Planned downtime and manual workload balancing for VM hosts