How VVR processes a read in a shared disk group


How VVR processes a read in a shared disk group
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This section explains how VVR processes an incoming read for a Primary cluster containing two nodes. In a shared-disk group environment, VVR processes an incoming read on the master in the same way as in a private disk group environment.

Figure: Example - how VVR processes a read on the non-logowner shows how VVR processes an incoming read on the non-logowner.

Figure: Example - how VVR processes a read on the non-logowner

As shown in the illustration, Figure: Example - how VVR processes a read on the non-logowner, VVR processes an incoming read on the non-logowner, (Node B) with the following steps in the order shown:

VVR receives a read from the application on the non-logowner, Node B.
Node B sends a request for read permission to the logowner, Node A.

Note:

All requests for read and write permissions are sent to the logowner. If the logowner is not the master, it sends permission requests to the master.
Node B receives permission to read from Node A.
Node B reads from the data volumes.
Node B completes read to the application.

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