Hi Petter, Do you know if your SAN guy has already done the appropriate TCP window size modifications to fill the pipe up? Regardless, I am using WAN optimizers to do iSCSI storage replication across a 230-320 ms 300 Mb shared pipe and have been extremely pleased with the results. And the compression and caching works great. Of course, YMMV depending on the nature of the payloads. I wouldn't go as far as saying you need permission from your storage vendor to do it, but you should at least ask if the data is encrypted or compressed during native replication sessions. If yes (and if there is no way to turn that off), then a WOC won't do you much good at all, as the only major trick they'd have left is some TCP optimization, which of course you can mostly do for free. Feel free to contact me off list if you want to discuss particulars. Best, Dan On Thu, Apr 18, 2013 at 7:20 PM, Petter Bruland < Petter.Bruland@allegiantair.com> wrote:

Question for someone with some experience with long haul links (Las Vegas -- New Jersey)

[Cisco 4510 - SVI-VLAN x]---trunk---[Nexus5K LH optic]===fiber==={carriers across country}===fiber===[Nexus5K LH optic]---trunk---[Cisco 4510 - SVI-VLAN x]

We have two circuits, one that is the same vendor from east to west, and the other circuit is a two vendor deal. Both circuits are 1 Gbps with around 67-70 ms delay.

As soon as we had the links turned up, our SAN guy started complaining about poor throughput, asking us to throw in a couple of wan accelerators. He was seeing a max throughput of around ~200 Mbps.

Question: For a long haul 1 Gbps link with 67-70 ms delay, would installing a pair of wan accelerators make a big difference?

Thanks, -Petter Bruland