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Veritas Cluster Server: Configuring Oracle VM Server for SPARC for high availabilityOracle VM Server for SPARC guest domain migration in VCS environment129Overview of a live migrationThe Logical Domains Manager on the source system accepts the request to migratea domain and establishes a secure network connection with the Logical DomainsManager that runs on the target system. The migration occurs after this connectionhas been established.The migration operation occurs in the following phases:Phase 1Phase 2Phase 3Phase 4Phase 5After the source system connects with the Logical Domains Manager thatruns in the target system, the Logical Domains Manager transfersinformation about the source system and the domain to be migrated to thetarget system. The Logical Domains Manager uses this information toperform a series of checks to determine whether a migration is possible.The Logical Domains Manager performs state-sensitive checks on the domainthat you plan to migrate. The checks it performs is different for an activedomain than for bound or inactive ones.When all checks in Phase 1 have passed, the source and target systemsprepare for the migration. On the target system, the Logical DomainsManager creates a domain to receive the domain. If the domain that youplant to migrate is inactive or bound, the migration operation proceeds toPhase 5.If the domain that you want to migrate is active, its runtime state informationis transferred to the target system. The domain continues to run, and theLogical Domains Manager simultaneously tracks the modifications that theoperating system makes to this domain. The Logical Domains Manager onthe source retrieves this information on the source from the sourcehypervisor and sends the information to the Logical Domains Manager onthe target. The Logical Domains Manager on the target installs thisinformation in the hypervisor for the target.The Logical Domains Manager suspends the domain that you want to migrate.At this time, all of the remaining modified state information is re-copied tothe target system. In this way, there should be little or no perceivableinterruption to the domain. The amount of interruption depends on theworkload.A handoff occurs from the Logical Domains Manager on the source systemto the Logical Domains Manager on the target system. The handoff occurswhen the migrated domain resumes execution (if the domain to be migratedwas active), and the domain on the source system is destroyed. From thispoint forward, the migrated domain is the sole version of the domainrunning.With Oracle VM Server for SPARC 2.1, the default domain migration attemptedis Live Migration. If the installed version of Oracle VM Server for SPARC is 2.0,