High Availability and Disaster Recovery

• The most comprehensive high availability and disaster recoveryfor physical and virtual servers on Windows
• Real-time application and data protection
• Use existing hardware, software and network
• Full server protection and fail over
• Fail over 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

MaManaging your server availability environment with Double-Take Availability is simple though the Double-Take Console. One interface allows you to manage high availability and disaster recovery on 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.

• Ensures easy manual or remote installation and configurationli>
• Provides both automated and push-button, on demand fail over for physical or virtual machines to the second host
• Provides push-button failback or reverse
• Provides server network or service monitoring for automatic fail over and fail over condition notification
• Validates settings with pre-flight check and auto-fix features
• Improves performance by compressing the protected data before sending
• Simulates replication traffic and estimates needed bandwidth with the Double-Take Diagnostics job
• Provides integrated automated test fail over
• Provides email event notifications
• Simplifies management with the ability to forward replication statistics and events via SNMP to your enterprise management tools
• EnEnsures the integrity of real-time replicated data with patented write-order consistency

Virtualization

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.

• UnUnifies high availability and remote availability across physical and virtual environments, including VMware vSphere and Microsoft Hyper-V
• Fail over physical servers to virtual environments with fail over-time virtualization technology that automatically provisions a new VM to match the production server
• Protect and fail over 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 fail over policies
• Management of all physical and virtual fail over 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 serversli>
• InIntegrates seamlessly with Hyper-V management interfaces

ClClustering

The GeoCluster^™ feature of Double-Take Availability lets you implement fail over 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 failureli>
• 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 fail over clusters without shared storage or geographic limitations
• Allows you to locate cluster nodes anywhere
• Provides off-site cluster fail over capabilities
• Turns Microsoft Windows Server clusters into Shared Nothing Clusters
• Stretches cluster nodes between physical locations while still using native failure detection and fail over
• 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
• MaMaintains complete storage independence

How It Works

Double-Take Availability combines continuous real-time replication and automatic fail over capabilities for disaster recovery, high availability, and centralized backup on physical or virtual Windows servers. Double-Take Availability uses patented replication and fail over 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 files that reside on the target server – sending only real-time byte-level changes across any IP connection.

Windows Requirements

• Windows Server 2003 / 2008 Standard, Enterprise and Datacenter Editions (32-bit / 64-bit)

Hyper-V Requirements:

• MiMicrosoft .NET 3.5 SP1
• VMs stored on a standard NTFS file system
• TCP/IP with static IP addressing or reserved DHCP addressing for Hyper-V hosts

VMWare Requirementsp>

• VMware VirtualCenter 2.x or later
• VMware ESX Server 3.x or later