Ensure the availability of critical systems with real-time replication and failover

Plug-and-Play Application Availability for Windows® Servers.


Real-time Windows high availability: Total workload mobility and protection for unlimited IT evolution

Double-Take® Availability for Windows is the first real-time high availability and disaster recovery solution to offer options for physical, virtual, and cloud servers. Double-Take Availability allows you to fine-tune your recovery and efficiency targets with flexible RTO and RPO.

No matter the size of your business, you can take advantage of full-scale protection at an affordable price. Because it’s platform, storage, and hardware independent, Double-Take Availability reduces your overall operating costs by optimizing existing infrastructure and scaling with whatever you build in the future.

Double-Take® Availability® for Windows offers affordable data protection, provides fault tolerance and enables immediate recovery from any system outage at the push of a button through a unified console. Continuous data replication over any distance ensures you always have access to a current copy of your data, applications and operating system.

Double-Take Availability monitors changes and replicates only the bytes that change. Resource-friendly technology allows you to replicate to any disaster recovery site, over standard IP networks, for maximum protection against data loss. Choose between application-level or full-server failover to configure an alternate system to take over for the production server in the event of an outage. Double-Take Availability protects Exchange, SQL Server®, SharePoint® and more.


Features and Functionality

High Availability and Disaster Recovery

The most comprehensive high availability and disaster recovery for physical and virtual servers on Windows
Real-time application and data protection
Use existing hardware, software and network
Full server protection and failover
Failover executed in minutes, not hours, and supports dissimilar hardware
Managed from a single unified console
Supports MS Exchange, SQL Server (including SQL 2012), Oracle, SharePoint, Blackberry® Enterprise Server and more
Microsoft Volume Shadow Copy Service integration allows you to schedule and recover from up to 64 point-in-time copies of data on your physical or virtual target
No distance limits for backup server
Near-zero data loss
Microsoft Windows 2003 and 2008 R2 certified

Simple Management

Managing your availability environment with Double-Take Availability is simple though the Unified Management Console. One solution allows you to manage multiple platforms and hypervisors. Advanced and evolved management features do most of the work for you. For example, an auto-provision feature handles the creation of VMs for virtual environment protection.

Features one-click failover and restore
Ensures easy installation and optimized configuration with IntelliStart™
Provides automated, push button failover for physical or virtual machines to the second host on demand in an outage with SwitchAssistant™
Validates settings with pre-flight check and auto-fix
Monitors and auto-switches critical systems
Presents centralized reporting and analysis
Improves performance by compressing the protected data before sending
Simulates replication traffic* and estimates needed bandwidth with the Double-Take Availability Throughput Diagnostics Utility
Provides email event notifications
Simplifies management with forwarded replication statistics and events via SNMP to your enterprise management tools
Ensures the integrity of replicated data on with patented write-order consistency
*except ESX


Some data protection offerings on the market are designed specifically for virtual environments. Double-Take Availability unifies the management of the HA topology across physical and virtual environments, thereby reducing HA management complexity. Beyond HA, depending on the platform, Vision Solution’s migration solutions can facilitate the migration of a physical server to a virtualized environment (and back again if that becomes necessary or desirable) with little or no downtime.

Unlike the snapshot copy mechanisms of some other HA options, Vision Solutions’ HA products replicate data and system object changes continuously in real-time or near real-time.

Unifies high availability and remote availability across physical and virtual environments, including VMware vSphere and Microsoft Hyper-V
Failover physical servers to virtual environments with failover-time virtualization technology that automatically provisions a new VM to match the production server
Protect and failover VMs over any distance without the need for underlying storage replication
Reduce the cost and management overhead of duplicate physical infrastructure at a DR site by using a virtualized DR site
Protect virtual environments using real-time continuous replication of VMs with host-level management of failover policies
Management of all physical and virtual failover protection in a single solution, for superior manageability
Failed over VMs are partition-aligned to the underlying physical disks for optimum performance of I/O intensive applications in virtual environments
Enables no-downtime full-server migrations to physical or virtual servers
Integrates seamlessly with Hyper-V management interfaces


The GeoCluster™ feature of Double-Take Availability lets you implement failover clusters without shared storage or geographic limitations – eliminating the single point of failure and giving you the freedom to locate cluster notes wherever you want them.

Double-Take Availability also provides the technology you need to ensure maximum availability for your Windows Server®Clusters.

Eliminates single points of failure
Efficiently replicates data changes and allows cluster nodes to quickly restore application services after a failure
Guards against data corruption by keeping clusters from failing over to a node that has suspect data
Implements failover clusters without shared storage or geographic limitations
Allows you to locate cluster nodes anywhere
Provides off-site cluster failover capabilities
Turns Microsoft Windows Server clusters into Shared Nothing Clusters
Stretches cluster nodes between physical locations while still using native failure detection and failover
Ensures write-order preservation of logical application writes
Ensures production nodes don’t suffer performance degradation because of intermittent network failures or node failure
Uses minimal CPU overhead while delivering real-world measured performance of 65-75% compression for database applications
Maintains complete storage independence

How It Works

Double-Take Availability combines continuous real-time replication and automatic failover capabilities for disaster recovery, high availability, and centralized backup on physical or virtual Windows servers. Double-Take Availability uses patented replication and failover capabilities that continuously capture byte-level changes as they occur and replicates those changes to another server either locally or over any WAN link. Real-time replication is superior to snapshot-based store and forward replication because it eliminates several points of vulnerability.

Double Take Availability captures disk-writes at the host’s file system layer while all applications (including virtual machines writing to virtual disks) operate above the actual file system layer. This allows the solution to transparently and reliably protect that data by replicating it via its normal mechanisms to a target server running another copy of Double-Take Availability. On the target side, Double Take Availability simply applies the same file update commands to the duplicate wp-content/uploads that reside on the target server – sending only real-time byte-level changes across any IP connection.

More Information
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