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Don Burleson Blog 







Oracle SVC Replication

Oracle Database Tips by Donald BurlesonJune 9, 2015

Question:  I want to be able to replicate from one production database to a remote backup instance.  I have heard that I can use the IBM SAN Volume Controller (SVC) to accomplish this.

What is SVC and how can I use SVC to keep a remote database synchronized with my production database?  How do I use IBM SVC for Oracle data replication?

Answer:  IBM SVC is an IBM storage virtualization tool that uses replication services at the source and destination servers.  IBM SVC has a hardware component called an engine, or SVC node, that contains 8GB of high-speed RAM. Because the nodes must be installed in pairs, when you set up an SVC system, you are essentially creating a high speed cluster.

You can use SVC to keep a remote backup database synchronized with a production database using the SVC feature called Metro Mirror.  Metro Mirror provides a synchronous copy process.  When a host writes to the primary volume, confirmation of the write is not received until the write has been completed on both the primary node and the secondary node.  This ensures that the backup is always up to date with the primary node, in the event that the primary node fails.   The usage of Metro Mirror is limited by the distance between sites, due to the large impact latency and bandwidth between nodes has on performance.

You can also use SVC to keep a remote backup using the Global Mirror feature.  Global Mirror provides an asynchronous copy process.  When a host writes to the primary volume, it receives confirmation of the I/O before the copy process to the backup is completed.  If the primary node fails, the application must recover and apply any updates that were not committed to the secondary node.  If I/O operations are paused on the primary node for a small length of time, the secondary node can become an exact duplicate of the primary node.   This feature is comparable to a continuous backup process where the last few updates are always missing.  When you use SVC Global Mirror for disaster recovery, you must always have a plan for handling the missing updates.

Burleson Consulting provides complete IBM SVC replication services. 

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