IaaS DR vs. VMware Licensing: Stop Paying for Standby Capacity
You're paying full VMware licenses for DR capacity that sits idle 99.9% of the time. Here's the math on IaaS failover—and when it makes sense (and when it doesn't).
Analyst Brief: IaaS DR Decision Framework
Get our free decision framework to evaluate traditional DR vs. IaaS failover vs. hybrid approaches. Includes cost comparison tables, workload tiering guide, and implementation checklist.
The Problem: Paying for Idle Capacity
Most mid-market companies maintain a disaster recovery site with VMware infrastructure that mirrors their production environment. That DR capacity sits there, powered on but idle, waiting for a disaster that (hopefully) never comes.
And you're paying full VMware licensing for it.
With Broadcom's VCF subscription model charging per VM per year, that idle DR capacity just got a lot more expensive. Let's show the math.
The Math: Traditional DR vs. IaaS Failover
Example: 50-VM Production Environment with DR
Traditional DR (On-Prem VMware)
Production site:
- 50 VMs × $300/VM/year (VCF Enterprise) = $15,000/year
- Hardware (servers, storage, network): $100K capex (amortized over 5 years = $20K/year)
DR site:
- 50 VMs × $300/VM/year (VCF Enterprise) = $15,000/year
- Hardware (servers, storage, network): $100K capex (amortized over 5 years = $20K/year)
- Colocation/power/cooling: $2,000/month = $24,000/year
Total annual DR cost: $59,000/year
(And that DR capacity sits idle 99.9% of the time)
IaaS DR (Cloud Failover)
Production site:
- 50 VMs × $300/VM/year (VCF Enterprise) = $15,000/year
- Hardware: $100K capex (amortized = $20K/year)
DR site (AWS/Azure/GCP):
- Replication storage: ~$500/month = $6,000/year
- Compute (only when failed over): $0 normally, ~$5,000/month during failover
- Assume 2 failover tests/year (1 week each): ~$2,500
Total annual DR cost: $8,500/year
Savings: $50,500/year (86% reduction)
That's $50K/year you're not spending on idle capacity. Over 3 years, that's $150K in savings.
The Tradeoffs (Because Nothing's Free)
IaaS DR isn't a silver bullet. There are real tradeoffs you need to understand before making the switch.
| Factor | Traditional DR | IaaS DR |
|---|---|---|
| Cost | High (idle capacity) | Low (pay when used) |
| RTO (Recovery Time) | Fast (minutes) | Slower (15-30 min) |
| RPO (Data Loss) | Low (continuous replication) | Low (continuous replication) |
| Control | Full (your hardware) | Shared (cloud provider) |
| Failover Testing | Complex (impacts DR capacity) | Easy (spin up test instances) |
| Dependency Risk | Low (independent infrastructure) | Medium (cloud provider dependency) |
| Compliance | Easier (full control) | Harder (shared responsibility model) |
When IaaS DR Makes Sense
IaaS DR is a great fit when:
✓ Your RTO tolerance is 15-30 minutes
If you can afford a slightly longer recovery time (spinning up cloud instances vs. instant failover to hot standby), IaaS DR works well. Most mid-market companies can tolerate this.
✓ You're trying to reduce VMware licensing costs
With VCF subscriptions charging per VM, eliminating DR licensing is an easy win. You're not paying for idle capacity anymore.
✓ Your workloads are cloud-compatible
Standard x86 workloads, modern applications, and containerized services fail over to IaaS easily. Legacy apps with hardware dependencies or licensing restrictions may not.
✓ You want easier failover testing
IaaS DR makes testing trivial—spin up test instances without impacting production or DR capacity. Traditional DR testing is complex and risky.
When to Stick with Traditional DR
IaaS DR isn't right for everyone. Stick with traditional DR if:
✗ Your RTO requirement is under 5 minutes
Mission-critical applications that can't tolerate any downtime need instant failover to hot standby. IaaS DR can't match that.
✗ You have strict compliance requirements
Some industries (finance, healthcare, government) have regulations that make cloud DR difficult. Shared responsibility models and data residency requirements may force on-prem DR.
✗ Your workloads have licensing restrictions
Some software licenses prohibit cloud failover or charge extra for it. Oracle databases are notorious for this. Check your licensing terms before committing to IaaS DR.
✗ You don't trust cloud providers for DR
If your disaster scenario includes "what if AWS goes down?" then cloud DR doesn't help you. You need geographically diverse, independent infrastructure.
The Hybrid Approach (Best of Both Worlds)
You don't have to choose one or the other. Many companies use a hybrid approach:
- Tier 1 workloads (mission-critical): Traditional DR with hot standby for instant failover
- Tier 2 workloads (important but not critical): IaaS DR with 15-30 minute RTO
- Tier 3 workloads (can tolerate hours of downtime): Backup-only, restore from snapshots if needed
This tiered approach lets you optimize costs without sacrificing protection for your most critical systems.
Hybrid DR Cost Example (Same 50-VM Environment)
Tier 1 (10 VMs): Traditional DR
VCF licensing + hardware + colo = $15,000/year
Tier 2 (30 VMs): IaaS DR
Replication storage + occasional failover = $6,000/year
Tier 3 (10 VMs): Backup-only
Cloud backup storage = $1,000/year
Total hybrid DR cost: $22,000/year
Savings vs. full traditional DR: $37,000/year (63% reduction)
Still protecting critical systems with instant failover, but cutting costs on everything else.
What Most IT Leaders Don't Know
Here's what nobody tells you about IaaS DR:
- You can use IaaS for DR without migrating production workloads to the cloud. Keep production on-prem, fail over to cloud only during disasters.
- Cloud providers offer DR-specific pricing that's cheaper than standard compute. Ask about it.
- Some cloud migration funding programs (AWS MAP, Azure Migration Program) cover DR setup costs if structured correctly.
- You can test failover as often as you want without impacting production or DR capacity—something traditional DR makes difficult.
The key is understanding the tradeoffs: risk vs. dollars vs. sunk costs vs. control. There's no one-size-fits-all answer.
About the Author: HyperScaleIQ brings 25+ years of experience working inside companies like Dell, RapidScale, Rackspace, and Cyxtera. We help mid-market IT leaders navigate infrastructure decisions with real math, honest tradeoffs, and objective guidance.