high_scalability high_scalability-2009 high_scalability-2009-645 knowledge-graph by maker-knowledge-mining
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Introduction: You might think major Internet companies have a latency, availability, and bandwidth advantage because they can afford expensive dedicated point-to-point private line networks between their data centers. And you would be right. It's a great advantage. Or it at least it was a great advantage. Cost is the great equalizer and companies are now scrambling for ways to cut costs. Many of the most recognizable Internet companies are moving to IP VPNs (Virtual Private Networks) as a much cheaper alternative to private lines. This is a strategy you can effectively use too. This trend has historical precedent in the data center. In the same way leading edge companies moved early to virtualize their data centers, leading edge companies are now virtualizing their networks using IP VPNs to build inexpensive private networks over a shared public network. In kindergarten we learned sharing was polite, it turns out sharing can also save a lot of money in both the data center and on the network. The
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1 You might think major Internet companies have a latency, availability, and bandwidth advantage because they can afford expensive dedicated point-to-point private line networks between their data centers. [sent-1, score-0.504]
2 In the same way leading edge companies moved early to virtualize their data centers, leading edge companies are now virtualizing their networks using IP VPNs to build inexpensive private networks over a shared public network. [sent-9, score-0.516]
3 The line of reasoning for adopting IP VPNs goes something like this: Major companies are saving 1/4 to 1/2 of their networking costs by moving from private lines to IP VPNs. [sent-11, score-0.349]
4 Lose a packet and you'll have to wait for a retransmission which will take at least 1 second. [sent-19, score-0.321]
5 So IP VPNs can provide an order of magnitude more bandwidth for less money, but they often have less actual throughput and reliability. [sent-20, score-0.301]
6 WAN accelerators are typically thought to be mostly about caching, but they can also can trick TCP into giving a better connection even over unreliable networks. [sent-24, score-0.433]
7 Relatively inexpensive WAN accelerators can turn somewhat unreliable Internet connections into a very reliable cost effective connection option. [sent-27, score-0.579]
8 But here's the impact packet loss has on throughput: Latency: 100ms, Loss: 1%, Throughput: 1. [sent-31, score-0.576]
9 You could have an 100Mbps link with 1% loss and 100ms latency and you're limited to 1Mbps! [sent-36, score-0.46]
10 The reason why we have this bandwidth robbing state of affairs is because when TCP was designed packet loss meant network congestion. [sent-37, score-0.662]
11 Over long distance WAN connections packets can be delayed which seems like a packet loss which causes congestion avoidance measures to kick in. [sent-40, score-0.739]
12 Or maybe only a single packet was dropped and that kicks in congestion avoidance. [sent-41, score-0.38]
13 The trick is convincing TCP that everything is cool so the full connection bandwidth can be used. [sent-42, score-0.302]
14 WANs are different from LANs in three ways – WAN bandwidth is a fraction of LAN bandwidth, WAN latency is orders of magnitude higher than LAN latency, and packet loss exists on the WAN where none existed on the LAN. [sent-49, score-0.779]
15 Most IT professionals are familiar with the impacts of bandwidth on transfer times – a 100MB file takes approximately 1 second to transfer on a Gbps LAN and approximately 10 seconds to transfer on a 100Mbps LAN. [sent-50, score-0.982]
16 Introduce 100ms of latency and this transfer now takes almost 3 minutes. [sent-53, score-0.334]
17 Introduce just 1 % packet loss and this transfer now takes over 10 minutes. [sent-54, score-0.723]
18 Once you know your effective throughput simply divide 800Mb (100MB) by your effective throughput to determine how long it would take to transfer the same example file over your WAN. [sent-56, score-0.732]
19 Latency and loss don’t just impact file transfer times, they also have a dramatic impact on any applications that need to be accessed in real-time over the WAN. [sent-57, score-0.686]
20 Not only is the server 100 ms away but any lost packet will result in delays of up to half a second waiting for the loss to be detected and the retransmission to occur. [sent-59, score-0.599]
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