SAN Volume Controller Enhanced Stretched Cluster with VMware Draft Redbook
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Prior to the version 7.2 SAN Volume Controller software release, stretched cluster configurations did not provide manual failover capability, and data being sent across a long distance link had the potential to be sent twice. The addition of 'site awareness' in version 7.2 routes I/O traffic between SVC nodes and storage controllers to optimize the data flow, and it polices I/O traffic during a failure condition to allow for a manual cluster invocation to ensure consistency.
The use of Enhanced Stretched Cluster continues to follow all the same hardware installation guidelines as previously announced and found in the product documentation. Use of enhanced stretched cluster is optional, and existing stretched cluster configurations will continue to be supported, and can be converted to the new enhanced version with a few simple commands.
We describe how this can be implemented and combined with VMware in this IBM Redbooks publication, available in draft state at: