Data replication is a continuous process that involves recording changes to data created on the main computer and forwarding those changes to the secondary storage device. This information is transmitted electronically and typically occurs at the end of each business day. Depending on the amount of information being transferred, the process can take anywhere from one hour to eight hours or more.

In addition to data replication, data mirroring is another component of the IT disaster recovery plan. Data mirroring involves creating a copy of the primary disk which is referred to as a "shadow" disk. The shadow disk is updated at the same time as the primary disk, providing a real-time copy of the primary disk.

Data mirroring is conduced on-site and the shadow disk is attached to a host machine. Should the primary disk fail, the data from the shadow disk can be retrieved and integrated into the primary disk.

The key to developing an IT disaster recovery plan is to make certain the system administrator has quick and easy access to the back-up data should a catastrophic failure occur. S/he must be able to quickly redirect application servers in order to access data from the shadow disk or the back-up data stored off-site.

IT disaster recovery is a necessity for any corporate entity. However, due to budget constraints and the complexity of existing IT disaster recovery solutions many fail to implement the necessary components to protect their data.

If your company is struggling to implement an IT data disaster recovery plan, consider hiring an outside firm to establish a protocol. The cost of this service will depend on the complexity and amount of the data to be stored and updated.

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