Based on the computing and storage resources occupied by the applications to be migrated, the complexity of redeploying the applications, and their usage characteristics, the entire migration process will be organized with the application system as the primary unit, following the principle of “unified planning, easy first then difficult, phased handling.” Specifically:
Principle of Overall Coordination: Migration requires collaboration across multiple departments and levels to ensure smooth execution. Service shutdown/startup and post-migration verification require participation from both IT and business departments. Migration work should be carried out under the unified coordination of the customer’s overall project leader (project manager), enabling cross-departmental collaboration.
• Clear accountability:Define responsible units and individuals for migration tasks.
• Pre-communication: Share the migration plan in advance with operations and related system teams and provide technical support.
• Closed-loop confirmation:After switchover, promptly notify relevant personnel and verify the system’s operational status.
Principle of Availability: Migration must be carried out under the premise that business availability is ensured after migration. Each application system must develop a detailed and feasible migration plan along with a complete contingency plan. For systems involving cross-network data exchange, network connectivity must be tested. The cutover can only be performed after verifying the availability of new applications and data. After the cutover, data integrity must be validated to ensure normal business operations.
Principle of Rationality:Based on system surveys and business impact assessments, select migration solutions scientifically, prioritizing minimization of downtime and business impact. Within the permitted downtime window, balance cost-effectiveness, manpower, and time efficiency.
Principle of “Easy First, Difficult Later”:Since migration involves different types of systems (varying in scale, architecture, and business dependencies), a phased strategy should be adopted:
Pilot migration:Start with non-critical, small-scale, and low-dependency systems to verify the new data center environment (network/compute/storage).
Dynamic optimization: Summarize pilot experiences and adjust subsequent migration plans iteratively.
Order of migration:
• Start with simple systems, such as single-server systems.
• Migrate general business systems before core systems.
• Migrate systems with smaller data volumes first, then larger ones.
• Prioritize migrating applications before databases; for databases, a shutdown-then-migrate approach is recommended.
• Avoid changing the existing network architecture of business systems as much as possible.
• Make full use of holidays and nighttime for migration, with thorough validation, to minimize the impact on daily business operations.
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