SAN Replication For Disaster Recovery

Disaster Recovery

In enterprise IT, Disaster Recovery refers to the implementation of some mechanism to protect business data, normally moving it, or replicating it off-site, where it can then be used to get critical business systems back up and running. One of the critical steps in a disaster recovery plan is to effectively get business data off-site. Storage area network (SAN) replication is the most efficient way to ensure business data continuity in the event of a disaster.

Today, enterprises maintain a private line, or a second wide-area network for (SAN) replication, across data centers. This replication approach is fundamental for disaster recovery initiatives and distributed storage systems. SAN-based replication is the ideal solution for businesses that want to back up part of their infrastructure. Replication is an entire mirror image of the entire SAN, and replication is performed in near real-time. It utilizes a dedicated network that is low-latency and extremely reliable and delivers packets in the correct order which are all critical to achieving successful replication of storage from one data center to another.

SAN replication effectively keeps the data in sync between two sites. It runs under the cluster so that both storage arrays, one in each site, are kept in sync using either asynchronous or synchronous replication. SAN replication solutions close the gap between high-end array-based approaches and low-end server-based approaches. They support a range of storage services, including rollback capabilities and point-in-time snapshot replication, remote and local synchronous mirroring, asynchronous mirroring over long distances, providing various remote and local data replication options.

Synchronous Replication: This type of replication writes the data to both the primary and to the secondary area at the same time. The data remains completely current and identical. It is a fast process and there is a very small margin of error. It is ideal for disaster recovery and is the method preferred for projects that require absolutely no data loss. With Synchronous replication, there is zero Recovery Point Objective, works best if both SANs are in the same data center, and is the most expensive type of SAN solution.

Asynchronous Replication: This type of replication writes data to both a primary and secondary site. However, with this process, there is a delay when data is copied from one to another. The data first writes to the primary array and then commits the data for replication to a secondary source – either disk-based or memory. The data copies at scheduled intervals to the target. This method can work over longer distances than synchronous replication. With Asynchronous Replication, there is15 minutes to a few hours Recovery Point Objective, works well anywhere with a good data connection, and is not as expensive as Synchronous but is more expensive than basic SANs.

SAN replication solutions support heterogeneous server platforms and heterogeneous storage devices. This provides an extensive range of configurations which provides the flexibility required to implement a tiered-storage model. Business applications can be mapped to the most economical storage solution. As well, VMware SRM utilizes san replication to accomplish a complete disaster recovery solution. In addition, physical servers with disks on the SAN can be replicated.

Disaster Recovery( DR) at Web is a contingency plan to restore business data and systems in the event of a catastrophe. SAN replication is the process of creating a complete copy of data between two Storage Area Networks (SAN). San replication is the most effective methods for enabling businesses to have real-time, off-site replication of their data. It offers the advantage of cost-efficient and flexible storage infrastructures. Businesses benefit from getting get the flexibility they need to maximize all their business storage assets. In the event of a disaster, Storage area network (SAN) replication is the most efficient way to ensure business data continuity.