On-Premise'den Cloud'a Geçiş: Step-by-Step Migration Stratejisi
On-Premise'den Cloud'a Geçiş: Step-by-Step Migration Stratejisi
Cloud migration "VM'leri cloud'a taşımak" değil. Re-architecture, optimization, cost planning gerektirir. 3 yıllık deneyimimizle proven migration framework.
6R Migration Strategy
1. Rehost (Lift & Shift)
Ne: VM'leri olduğu gibi cloud'a taşı
Avantaj: Hızlı (2-4 hafta)
Dezavantaj: Cloud-native benefits yok
Use Case: Legacy apps, deadline yakın
2. Replatform (Lift & Reshape)
Ne: Minimal değişiklikle cloud optimize et
Örnek: MySQL VM → AWS RDS
Benefit: Managed services, %30 operational overhead azalması
3. Refactor (Re-architect)
Ne: Cloud-native yeniden yaz
Örnek: Monolith → Microservices + Kubernetes
Benefit: Maximum scalability, agility
Cost: En pahalı, en uzun
4. Repurchase
Ne: SaaS ile değiştir
Örnek: On-prem Exchange → Microsoft 365
Benefit: Zero maintenance
5. Retire
Ne: Kullanılmayan uygulamaları kapat
Stats: Ortalama %10-15 apps retire edilebilir
6. Retain
Ne: Şimdilik on-prem bırak
Neden: Compliance, cost, complexity
Migration Süreci
Phase 1: Discovery (2-4 hafta)
- Application inventory
- Dependency mapping
- Performance baselining
- Cost modeling (TCO)
- Risk assessment
Phase 2: Planning (4-6 hafta)
- Migration strategy (6R) her app için
- Architecture design
- Security & compliance
- Migration roadmap
- Team training plan
Phase 3: Pilot (6-8 hafta)
- Non-critical app ile başla
- Learnings document et
- Tools & processes refine et
- Team confidence build et
Phase 4: Migration Waves (3-12 ay)
- Wave 1: Low risk apps
- Wave 2: Medium complexity
- Wave 3: Mission-critical
- Her wave sonrası retrospective
Phase 5: Optimization (continuous)
- Cost optimization
- Performance tuning
- Security hardening
- FinOps practices
Common Pitfalls
❌ Mistake 1: TCO hesaplamadan migrate et
✅ Solution: 3-year TCO projection yap
❌ Mistake 2: Tüm apps aynı anda migrate et
✅ Solution: Wave approach, risk-based prioritization
❌ Mistake 3: Lift-shift yap, optimize etme
✅ Solution: Post-migration optimization phase
❌ Mistake 4: Network connectivity unutma
✅ Solution: VPN, Direct Connect erken setup
Tools
- Discovery: AWS Migration Hub, CloudEndure
- Assessment: Cloudamize, TSO Logic
- Migration: CloudEndure, AWS DMS, Azure Migrate
- Testing: CloudTest, LoadRunner
Success Metrics
- Migration on-time, on-budget
- Zero data loss
- Downtime < agreed SLA
- Performance >= baseline
- Cost within %10 of projection
- Team trained & confident
Sonuç
Cloud migration büyük proje. Doğru planning ile success rate %90+. Devups migration assessment isteyin.
