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Double-TakeWhat is Double-Take?Let me give you a nightmare scenario! Torrential rain overnight means that the building where your server is currently located is under 4ft of water. Your server (which had mirrored disks) is destroyed too. What do you do? Your server with its mirrored disks can't help you. Normally, you would revert to your overnight backup tape but that is flood damaged too! However, you do have the previous nights backup tape stored in an off-site location. You get the tape and restore the data from it onto your replacement server and bring the server back up and get your users back on-line. It would take at best hours and possibly days to restore a large server and you would have lost at least a whole days work to boot !!
There is an alternative - Double-Take.If Double-Take had been installed on your source server it would have replicated all file changes (as they occurred) to a target server in another building. This would mean that the target server would have a second by second up-to-date copy of what was on your source server. Failover The target server also hosts the failover module and continually monitors the source server. In the event of a server failure the target server could automatically assume the names and IP addresses of the failed server (in addition to its original name), it would also invoke scripts to restart applications. Users would be back on line in seconds or minutes with little or no data loss. Double-Take configurations Double-Take can be used in one-to-one mode as above or one-to-many, or many-to-one, chained or with two servers each acting as source and target for the other. In the example above the target server would have taken over as "source" server BUT could still be acting as "target" server for other source servers in a many-to-one configuration. Double-Take augments your existing back-up strategy. Double-Take can be used with your existing back-up system. The advantages are that if the system backed up the target server it could back up files that were locked open on the source server. This means that your source server need never be shut down to back up these files. Also if you were in a many-to-one configuration, you could do all back-ups from the single target server thus simplifying management and improving the performance of back-ups. Setting up Double-Take You choose the files, directories and server volumes to be replicated. A simple client system then copies this replication set to the target server (this mirroring operation can be done whilst both servers are active). These operations are both automatic and transparent. After that the replication, monitoring and failover functions are automatic. Platforms Multi-platform consistency provides identical functionality on NT/W2000/W2003. Cross platform management provides an integrated control point for all Double-Take machines. The Double-Take Management Console and Text client displays a comprehensive picture of all NT/W2000/W2003 Double-Take machines on your network. Resource Utilisation Features Network - Double-Take provides features to minimise network resource utilisation and provides options that allow network administrators to optimise bandwidth usage. AsynchronousOperation - Loosely coupled communication allows Double-Take to operate asynchronously enabling source machines to continue processing even when the network link is congested. By contrast, in synchronous systems, WAN connection bottlenecks can severely impair the performance of source machines. File Updates - The system only transmits changes made to files, not whole disk blocks or whole files. This dramatically reduces the amount of bandwidth required and means that Double-Take runs efficiently even over low bandwidth links. Isn't it time you had a look at Double-Take? For further information, please complete our online enquiry form.
 Double-Take for Windows, Server Recovery Option
DT_SRO Simplify Installation and Restoration with the Double-Take Server Recovery Option (SRO) Double-Take for Windows for Virtual Systems (5 Licenses)
DT_VIRTUAL Double-Take for Virtual Systems is the industry's first disaster recovery and availability solution designed for virtualized server environments. Double-Take for Virtual Systems deploys easily within each virtual session to protect each individual application independently. Double-Take for Windows, Advanced Edition
DT_WINADV When recoverability matters, depend on Double-Take to protect and recover business-critical data and applications. Double-Take for Windows, Server Edition
DT_WINSRV When recoverability matters, depend on Double-Take to protect and recover business-critical data and applications.  |
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