What Is VMware Cloud on AWS Disaster Recovery
VMware Cloud on AWS is a managed service that runs VMware’s Software-Defined Data Center (SDDC) software directly on AWS infrastructure. It lets IT teams operate workloads across private, public, and hybrid cloud environments using the same VMware tools they already know.
When used for disaster recovery, this service acts as an on-demand secondary site for your critical workloads. Instead of maintaining a physical “hot site” with idle servers and cooling costs, you use AWS’s global infrastructure as your recovery target — ready to spin up virtual machines (VMs) when you need them, and scaled back down when you don’t.
The real advantage is operational consistency. Because the cloud environment runs the same ESXi hypervisor and vCenter management as your on-premises data center, there’s no need for complex VM conversions or refactoring. Your workloads move to the cloud and run exactly as they did before.
How VMware Cloud on AWS Disaster Recovery Works
Setting up disaster recovery on VMware Cloud on AWS involves more than copying files to the cloud. It requires coordinating networking, storage, and compute resources so your vSphere-based workloads can switch to the cloud quickly and reliably.
Key Components and Prerequisites
Before you get started, several infrastructure pieces need to be in place.
- On-Premises Environment: A functional VMware environment running vSphere, managed by vCenter.
- SDDC on AWS: A Software-Defined Data Center provisioned in your chosen AWS region.
- Replication Engine: Most setups use vSphere Replication, which tracks changes to VM disk files and sends them to the cloud continuously.
- Orchestration Tool: You’ll typically use VMware Site Recovery (based on Site Recovery Manager) or VMware Cloud Disaster Recovery (VCDR) to automate recovery steps.
- Connectivity: A stable, high-bandwidth connection — usually AWS Direct Connect or a VPN — to handle initial sync and ongoing replication traffic.
Replication of VMware Virtual Machines
Replication is the foundation of the entire DR setup. Unlike traditional backups, it runs continuously or on a defined schedule, keeping a near-current copy of your VMs in the cloud.
You set a Recovery Point Objective (RPO) — the maximum amount of data loss your business can tolerate — which typically ranges from a few minutes to 24 hours. The replicated data is stored in AWS in a dormant state, consuming minimal compute resources until a disaster is declared.
Failover to VMware Cloud on AWS
When a disaster occurs, you trigger a failover. The orchestration tool powers on your replicated VMs in the cloud in a pre-defined sequence:
- Databases
- Application servers
- Web / frontend layer
Network re-mapping is handled automatically during this process. Pre-configured IP and DNS settings allow users to reconnect to their applications without manual reconfiguration on their end.
Failback After Recovery
Once your primary site is back online, you initiate a failback to return workloads to on-premises. The system syncs only the data changes — or “deltas” — that occurred while running in the cloud, rather than transferring entire VMs again. This significantly reduces the time and bandwidth needed to complete the recovery cycle.
VMware Cloud on AWS Disaster Recovery Architecture Example
Understanding the architecture helps clarify how data moves between your local environment and the cloud. Your on-premises site is the active side; the AWS SDDC is the standby side, ready to take over when needed.
On-Premises VMware Environment
The process starts in your local data center, where production workloads run on ESXi hosts managed by a local vCenter Server.
To prepare for recovery, you deploy two key components:
- vSphere Replication appliance — monitors VMs and tracks block-level changes
- Site Recovery plugin — orchestrates the recovery workflow
Tracking only changed data — rather than full VM snapshots — is what keeps bandwidth usage low and RPO achievable.
Replication to VMware Cloud on AWS
Changed data is transmitted from your local site to the VMware Cloud on AWS SDDC over one of two connection types:
- AWS Direct Connect — for low latency and consistent throughput
- Secure VPN — for encrypted transit over the public internet
On the AWS side, data is stored in Amazon S3 or high-performance vSAN storage, depending on which VMware DR service you use. A cloud-based vCenter instance stands ready to register and power on your VMs when a failover is triggered.
Failover Scenario
When a disaster hits — whether a power outage or a ransomware attack — you trigger a failover from the Site Recovery Manager interface. The following steps run automatically:
- Shutdown: If the primary site is still partially reachable, a graceful shutdown is attempted to prevent data corruption. If the site is completely down, this step is skipped.
- Final Sync: A last data synchronization captures any remaining changes before cutover.
- Power On: VMs are powered on in the AWS SDDC according to your pre-configured priority groups.
- Network Re-IP: If your network isn’t stretched via Layer 2 extension, the system automatically reassigns IP addresses so VMs can communicate in their new environment.
Benefits of VMware Cloud on AWS for Disaster Recovery
For many IT teams, traditional DR setups come with two persistent problems: high infrastructure costs and slow recovery times. Running disaster recovery on VMware Cloud on AWS addresses both, without requiring a second physical data center.
Eliminates the Need for a Secondary Data Center
Traditional DR meant maintaining a separate facility with redundant power, cooling, and hardware that sat idle most of the time. Moving your DR target to the cloud removes these capital expenditures (CapEx) entirely.
You also avoid the recurring cost of hardware refresh cycles — when aging servers need replacing every few years regardless of whether a disaster ever occurs.
Faster Failover and Recovery
The cloud environment is pre-provisioned and kept in sync with your production site, which directly shortens your Recovery Time Objective (RTO) — the time it takes to get critical systems back online.
Instead of manually restoring from tapes or remote backups, you trigger an automated failover sequence that brings up services in a pre-defined order — often within minutes.
Cost Efficiency with On-Demand Resources
Traditional DR requires paying for 100% of secondary capacity upfront, even when it’s never used. VMware Cloud on AWS supports a more efficient model:
- Steady state: A small footprint of hosts keeps data synchronized at low cost
- During a disaster or DR drill: Scale up to a full ESXi cluster on demand
- After recovery: Scale back down and stop paying for unused capacity
This approach means you only pay for high-performance compute when you actually need it.
Seamless Integration with Existing VMware Environments
Because VMware Cloud on AWS runs the same vSphere stack as your on-premises environment, there’s no new platform to learn. Your team works with the same:
- vCenter interface they already use daily
- Scripts and automation they’ve built over time
- Security policies already in place
This consistency reduces the risk of human error — which matters most during the high-pressure situation of an actual disaster.
Simplify VMware Cloud on AWS Disaster Recovery with i2Availability
VMware Cloud on AWS gives you a solid foundation for disaster recovery — but managing replication, failover, and failback across hybrid environments still demands careful configuration and ongoing monitoring. For organizations running mixed workloads across physical servers, VMware, and cloud platforms, keeping everything in sync adds operational complexity.
This is where i2Availability fits in. It’s an application-level high availability solution that adds automated fault detection, real-time replication, and fast failover on top of your existing DR infrastructure — reducing the manual effort required to keep critical systems protected.
Key Features of i2Availability
- Automated HA Assurance: i2Availability uses multi-heartbeat line detection combined with node and disk arbitration to prevent mis-switching and split-brain scenarios. Custom scripts handle automatic application startup and shutdown, and virtual IP drift enables sub-second failover without manual intervention.
- Zero-Delay Replication: Byte-level real-time replication captures all write operations as they happen, keeping RPO close to zero. Data on the standby side is ready to use immediately — no restoration step required — and reverse synchronization supports fast business rollback.
- Optimized Data Transfer: Bandwidth control, resume-enabled transfers, and multi-level compression keep replication traffic lean. Non-critical files are filtered out automatically, so your network resources stay focused on what matters.
- Enterprise-Grade Data Security: All data transmission is encrypted using AES or SM4 algorithms. The management system enforces strong password policies and includes anti-brute-force mechanisms to protect access.
- Unified Operational Management: A web-based console provides real-time visibility into replication status, service health, and switching events. It supports batch client deployment, template-based rule creation, and automatic diagnostics for network and configuration issues.
- Cross-Platform Compatibility: i2Availability supports deployment across physical-to-virtual, virtual-to-virtual, and hybrid cloud scenarios (P2V, V2P, V2V, P2P). It works with VMware, Hyper-V, and other major virtualization platforms, and does not rely on shared storage — making it suitable for heterogeneous environments.
VMware Cloud on AWS handles the cloud infrastructure side of disaster recovery. i2Availability complements it by adding application-level protection, automated switching, and centralized monitoring — so your team spends less time managing DR manually and more time trusting that it will work when it needs to.
Conclusion
VMware Cloud on AWS removes one of the biggest barriers to effective disaster recovery — the need for a dedicated secondary data center. By combining VMware’s familiar vSphere stack with AWS’s global infrastructure, organizations can achieve fast, reliable failover without the capital cost or operational overhead of traditional DR setups.
That said, no DR strategy runs itself. Replication needs to stay healthy, failover sequences need to be tested, and mixed environments need consistent oversight. Tools like i2Availability help close that gap by adding automated fault detection, real-time replication, and centralized monitoring across your entire infrastructure.
The most resilient DR setups share a few things in common:
- A clearly defined RPO and RTO that the architecture is actually built around
- Regular, non-disruptive DR drills to verify recovery plans before a real event
- Consistent monitoring across both on-premises and cloud environments
If you’re evaluating disaster recovery options for your VMware environment, VMware Cloud on AWS is a strong foundation — and pairing it with the right tooling ensures it holds up when it counts.