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Infiniband Network is a high-performance, very low-latency network layer that is active-active in all directions at 40 Gb / sec, which enables communication between the Database Server and Exadata Storage Server. In a production environment where for e.g., an Exadata Database Machine Half Rack is deployed, the Database Machine uses a state of the art InfiniBand interconnect (through Infiniband swtiches) between the servers and storage. Each database server host and Exadata cell has dual port Quad Data Rate (QDR) InfiniBand connectivity for high availability.

The non- availability of the interconnect on any database server host can impair that host's communication with the Exadata storage server and that of other hosts. As a result, user requests to that host may not be served instantly delaying the I/O operations. In the aftermath of this, missioncritical business services using the resources of that host may experience prolonged outages or slowdowns, resulting in considerable loss of revenue and reputation. To avoid this, administrators need to continuously monitor the I/O transmissions for each database server host connecting to the Oracle Exadata Storage Server. For this purpose, you can use the OraExaHoInCoTest test.

This test periodically auto- discovers the database server hosts connected to the target Oracle Exadata Storage Server through the Infiniband interconnects and for each database host, reports the I/O transmission capability. Using this test, administrators can figure out the database server host to which data was dropped frequently and figure out the reason behind such data being dropped during transmission.

Outputs of the test: One set of results for each host interconnect connecting the target Oracle Exadata Storage Server being monitored and the Oracle database server.

Measurement	Description	Measurement Unit	Interpretation
dropDuringTransmission	Indicates the rate at which data was dropped during transmission through this host interconnect.	MB/sec	Compare the value of this measure across host interconnects to figure out the host interconnect that frequently dropped during transmission.
dropDuringRDMATransmsn	Indicates the rate at which data was dropped during RDMA transmission through this host interconnect.	MB/sec	Compare the value of this measure across host interconnects to figure out the host interconnect that frequently dropped during RDMA transmission.
receivedRate	Indicates the rate at which data was received from this host interconnect.	MB/sec
retransmittedRate	Indicates the rate at which data was retransmitted through this host interconnect.	MB/sec
transmittedRate	Indicates the rate at which data was transmitted through this host interconnect.	MB/sec