Database High Availability Simplified

Synchronous Flash Storage for Extended Distance Clusters

Extended distance clusters provide a local disaster recovery solution across two locations with high availability characteristics of a local cluster. Unlike replication techniques, in extended distance clusters the data is mirrored by ASM synchronously across the two locations. At any given time all locations have exact full copy of the data.

Extended distance ASM clusters can be configured with RAC, RAC One Node, or single-instance databases.



The added latency on direct long-distance connections is approximately 0.005 ms/km. For a 100 km distance this produces 0.5 ms latency, which is still 10X lower than a typical latency of a traditional HDD based storage. Distances up to 100 km are acceptable for most OLTP loads. More careful testing of the target application is recommended for distances over 100 km. Dedicated 10 GbE connectivity with no routing is recommended between the sites.

The smallest storage configuration can consist of one NVMe SSD in each of the database nodes. Additional SSDs can increase capacity, performance, and also improve HA.

The solution can be deployed on bare-metal or on virtual machines.

“With FlashGrid and AWS we can now deploy a new application within two weeks instead of six months, without compromising our availability SLA.”

David Urban, VP Operations, Aria Systems

“FlashGrid SkyCluster provides us all elements needed for running our mission-critical Oracle databases in Azure: storage and networking software, deployment automation, and 24x7 support.”

Jay Wilder, Sr. Director of Software Engineering, Nuance Communications

“Implementing Oracle RAC with FlashGrid in AWS is an important milestone in Digital Virgo’s cloud journey.”

Mikolaj Klimek, Deputy Director IT Operations and Infrastructure, Digital Virgo

“With our new virtualized RAC running on FlashGrid architecture we do a 125GB full table scan in 6 seconds. That is an 11x improvement over our previous setup.”

Sam Shiel, Oracle DBA, Simplyhealth

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