Vitaliy S. wrote:WAN acceleration is not about data transfer speed difference, but it is more about amount of traffic that has to be sent over the WAN link.
I think we're saying the same thing.
The offsite copy has a finite amount of data to transfer.
The WAN acceleration feature compresses this data, to make it smaller, so that it transfers faster. Okay, the data doesn't really transfer faster, it reduces the size of data transferred so that it takes less time to transit.
"I had 10GB to transfer and it took 6 hours"
"I had 10GB to transfer and it took 3 hours" - most people would say that's "faster".
"I had 10GB to transfer, so I compressed it to 5GB, transferred it in 3 hours, and then expanded it back to 10GB at the other end." - technically not faster, but the traffic was reduced.
Bottom line is that WAN acceleration is supposed to make the amount of time it takes to perform the offsite copy shorter.
So the question is/was - do people notice the WAN acceleration feature?
Does anyone have any empirical evidence that it's better?
NOTE. "WAN Acceleration" is a really bad name. The word acceleration is about how quickly you get to a certain speed, not how fast you end up travelling. My car accelerates faster than a 747, but the 747 is much faster than my car. If anything the "acceleration" when you are compressing is slower, as it takes time to compress, and therefore slows down the rate at which data starts to send - even if the result is that the data is sent at a faster speed. Physics teacher would probably just shake his head at me right now...