Testing Cisco's Mobile Core, Data Center & Business Services
Cisco’s Data Center Interconnect (DCI) System is a solution used to extend transparent Ethernet segments (subnets) beyond the traditional boundaries of a single-site data center. By stretching the network space across two or more data centers, the DCI solution is able to facilitate the enterprise’s server virtualization strategy, support high performance, and provide nonstop access to critical business applications.
In this test, Cisco asked us to verify that Cisco’s data-center-to-data-center interconnect, accomplished by connecting two Nexus 7000s over a pair of 100-Gbit/s attached CRS-3 routers, could transfer very large data sets while enjoying the full benefits of the newly introduced 100GbE interfaces of the CRS-3. Cisco used a back-of-the-envelope calculation to figure out that the library of congress (20 Terabytes of data as the common belief goes) could be transferred, theoretically, in 1,600 seconds from one data center to another. Cisco was so sure of the ability of the solution that they challenged us to execute exactly this test. (The main 100-Gigabit Ethernet tests on the CRS-3 are documented in the first part of the article.)
We attached ten 10-Gbit/s tester interfaces to each one of the two Nexus 7000s and started sending the largest possible Ethernet frame sizes (over this medium: 9216 bytes) from one end to the next, clocking our transfer at 1,600 seconds (26.66 minutes). The question was simply: Had 20 Terabytes been successfully transferred at the end of the test interval?
The test setup emulated 10 file servers on each of the two data centers. Half of them were used to source the traffic and the other half were used to receive the data transfer - much like off-site backups that happen regularly across geographically dispersed data centers.
As a result, the test confirmed Cisco’s claim: The full amount of data was transferred at line rate within the time calculated in advance.
Page 14: Conclusion