Which two attributes describe key benefits of the InfiniBand network?

Which two attributes describe key benefits of the InfiniBand network?

A.
All Exadata database servers have a direct path link to each Exadata Storage Server.

B.
Cell-to-cell communication uses Reliable Datagram Sockets (RDS) over InfiniBand to achieve
low latency.

C.
Expanding from two Full racks to four only requires adding an external InfiniBand switch to be
at the top of the fat-tree topology.

D.
Each InfiniBand link provides 10 Gigabits of bandwidth.

E.
Oracle’s interconnect protocol uses direct memory access (DMA) to eliminate buffer copies and
reduce CPU use.

Explanation:
C: Oracle Exadata is architected to scale-out to any level of performance. To
achieve higher performance and greater storage capacity, additional database servers and
Exadata cells are added to the configuration – e.g., Half Rack to Full Rack upgrade. As more
Exadata cells are added to the configuration, storage capacity and I/O performance increases
near linearly.
E: Oracle’s interconnect protocol uses direct data placement (DMA – direct memory access) to
ensure very low CPU overhead by directly moving data from the wire to database buffers with no
extra data copies being made. The InfiniBand network has the flexibility of a LAN network, with the
efficiency of a SAN.
Incorrect:
Not A: The architecture of the Exadata solution includes components on the database server and
in the Exadata cell. The software architecture for a Quarter Rack configuration is shown below.

Not B: No cell-to-cell communication is ever done or required in an Exadataconfiguration.
Not D: Each InfiniBand link provides 40 Gigabits of bandwidth –