Hi Folks, Sorry about the OT here, I'm looking to get some feedback regarding some of the most common application protocols (CIFS, NFSv3,SQL net, Snapmirror, ndmcopy) used in most Enterprise envrionments and their behavior in a sub msec campus latency environments vs ~3 msec latency over 10G Lanphy environments in metro DC topologies and potential ways to speed them up.
In our lab testing using wan simulator and injecting 3msec latency (delay between 2 sites), we've noticed that all the above protocols take a considerable performance hit with when even minimal latency is introduced. The file/data transfers/transactions take almost twice as long or sometimes even more and the protocols aren't able to ramp up to use all the bandwidth available (Gig terminations on the src/dest boxes sitting idle). This behavior is completely different than what was noticed by removing 3 msec latency and running off a sub-msec configuration where most of the above protocols were able to ramp up and utilize a fair share of b/w available to help achieve faster file/data transfer rates/transaction times which is to be expected. Question is, is this something that other environments normally experience as well with the above listed protocol set where they are lightning fast in a sub-msec topology and slow in 3-5 msec environments, and if they do, what are some of the techniques that are being used today in the Industry to optimize these protocols and help achieve lan like performance over a low latency (3-5 msec) metro ethernet dwdm based WAN. WAN ACCeleration is normally a solution to speed up transfer rates but 3 msec isn't a big enough delay to perhaps introduce it, do other environments deploy WAN Accl in such environments anyways The reason for performance degradation solely seems to be latency related since there's tons of b/w available in the lab setup and over 10G lanphy paths. Do people still deploy QOS for better traffic management on the lanphy interfaces even with no saturation?. Overall I'm looking for some feedback and suggestions If possible as to how the industry is currently able to better utilize and saturate low latency based 10Glanphy circuits between metro DC locations and speed up protocols by somehow allowing them to ramp up and use as much of the b/w that's currently available. Any feedback would be greatly appreciated and thanks in advance. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
