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Tags: Disaster Recovery
Author: Mike Mosley
Date: August 16, 2016

Easily Protect and Migrate Physical Servers to the Cloud with Double-Take

Editor’s Note: As of January 2022, iland is now 11:11 Systems, a managed infrastructure solutions provider at the forefront of cloud, connectivity, and security. As a legacy iland.com blog post, this article likely contains information that is no longer relevant. For the most up-to-date product information and resources, or if you have further questions, please refer to the 11:11 Systems Success Center or contact us directly.

There are multiple services designed to back up and replicate virtual machines in your private or public virtual environments. However, very few are able to replicate and protect a physical server. And yet, many companies need to protect both virtual machines and physical servers because of legacy applications running on legacy infrastructure. Double-Take is an agent-based replication software that allows replication between similar operating systems. Because this replication takes place at the OS level, Double-Take can protect physical Linux and Windows servers to a virtual machine in 11:11 Systems’ Cloud environment.

The Double-Take Components

Double-Take uses an agent-based operating system for operating system replication. This means that all of the functionality and processing takes place within the operating system. It is because of this that a physical server can replicate to a virtual server and vice versa. This also limits the number of servers required for replication. At a minimum, Double-Take requires a source server (the server to be protected or migrated) and a target server (the server being replicated or migrated to). Unlike other products such as Veeam and Zerto, you do not need to add proxies, replication appliances, VM managers, or repositories. However, 11:11 does recommend creating one server on the target side to be used to manage the environment. This server does not require a license but allows you to monitor and manage all servers and jobs involved in your Double-Take replication environment. It also helps you revert back from failover tests and push installations to new servers.

Double_Take_manage_servers

This management server does not require an active license to administer the Double-Take environment and can be provisioned with the help of 11:11’s Cloud Services team. 11:11 engineers will be available to help you install the Double-Take console on your server and connect to the other servers you wish to replicate. Essentially, this Double-Take management server will act as the brains of the replication or migration project. From here, the next step is installing Double-Take on the source and target servers. This can be done by manually installing the software on the servers or pushing the installation from the Double-Take management server. For instructions on installing Double-Take, please refer to this document:  11:11 Systems:_Installing_Double-Take

The source server and target server should be similar in hardware specifications as well as operating systems. For instance, if you have a physical server with 2 CPUs, 4GB RAM, a 100GB C: drive, and a 200GB E: drive, you will want to build a virtual machine with the same hardware specs. You will also want to match the OS version, so if the physical server is running Windows Server 2008 R2 Datacenter, you should have the same OS version on the target server. With the source and target servers deployed and Double-Take installed, you are ready to create a Double-Take replica job.

Replication and Failover

Double-Take allows for multiple forms of replication. You have the ability to use files and folder replication, SQL and exchange replication, or full server replication.  Files and folder replication may be used if you would rather rebuild a legacy physical server as this type of replication does not require the same OS version. You could build a Windows 2012 R2 VM to replace an old physical file server and replicate just the user or shared folders.

 

SQL or Exchange replication allows for you to create redundancy between SQL/Exchange physical servers as well as clustered environments. Instead of protecting the raw files and folder data, this replication actually protects and copies the SQL or Exchange database. This could also be used when converting an existing physical Exchange or SQL server to your virtual environment. Full server replication replicates the entire source server including all files, folders, and applications. This replication allows you to fully convert a physical server to a virtual server or failover a physical server in a virtual environment.

 

A full server failover will reboot the target server. When the server powers back on, it will have received and reimaged itself to completely mirror the source server. This means that the target server will have the exact same hostname, IP, registry, and user login information as the source server. Effectively, when the failover completes, the target server “becomes” the source server. This is the recommended method when protecting or migrating an entire physical server as it easily and quickly converts the box into a virtual machine. Since the target will be a virtual machine in the 11:11 Cloud, there is always a revert or failback option by taking a snapshot of the target server. Again, 11:11 engineers are always available to not only assist in setting up replication but also testing and performing a failover. Here’s a useful reference document on creating replica jobs in Double-Take: 11:11 Systems:_Creating_Replica_Jobs_in_Double-Take.

 

There are many advantages to having one DR solution and cloud provider for your entire IT footprint – both virtual and physical – and the 11:11 solution with both Zerto and Double-Take enables that. Here’s an example of one of our customers – a law firm in New York City – that has had success with protecting both their physical and virtual machines.
Category: DRaaSBy Mike MosleyAugust 16, 2016
Tags: Disaster Recovery

Author: Mike Mosley

Mike Mosely is a cloud engineer at 11:11 and has worked at the company for over 3 years. He holds a number of VMware certifications including VCP5 as well as the Veeam VMCE certification. Mike works closely with customers to build cloud solutions that fit their requirements.

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PreviousPrevious post:Using Zerto for Disaster Recovery and Workload Migration to a VMware Cloud: Part 2NextNext post:DRaaS with Veeam – Introduction and Considerations

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