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An existing cluster is an excellent solution for local high availability but what it doesn’t provide is disaster recovery. So often, what you want to do is achieve both local high availability but also disaster recovery in a single solution. SIOS enables this by allowing you to extend clusters to DR sites to achieve both high availability and disaster recovery.

In a single configuration you have lots of different options when you do this depending on the servers and the storage that you have available in your environment. See video illustration for an example of four servers, also called a 2 x 2 cluster, where there are two servers and shared storage at the primary site and two other servers and a different piece of shared storage at the remote site. In this case you could fail your application between any of the four nodes and SIOS would handle the real-time replication of the data from one site to the other site. If you have an entire site outage, you have a real-time block level copy of your data at the remote site giving you both local failover at each site as well as remote failover between data centers in the event of a disaster. It doesn’t have to be that way as you may not have a second SAN at the remote site. There is also a three node cluster example with an existing node cluster connected to a SAN with a third node added with local storage.

SIOS is going to replicate the data from the primary site to the DR site and give you that same failover capability but this time without making that investment in a second SAN. There are many options based on the servers and storage you have available to take an existing cluster, extend that four DR and now in a single solution have both high availability and disaster recovery.

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