Tip #17. Why latency is important?

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Network response time is one of the important factors that affect SharePoint farm design. Measure the latency between SharePoint servers and users to reorganize servers according the smallest response time. This factor is a key point consideration to determine which of the supported deployment solutions to implement for your Office SharePoint Server deployment. (Latency is the time required for a packet to travel from one point on a network to another).

Use the Ping tool (ping.exe) to measure latency, which affects:

  • users - from the client computer to the Web server on the server farm
  • data centres, that host servers of the same farm - from a Web server in the remote data centre to the database server in the primary data centre

Do not forget to divide the round-trip result by two, because all measures are one way only, not round-trip. Compare results to the data below, and adopt environment to have latency lower those values.

Number of users

Concurrent users (10%)

Central Solution

Distributed solution

100-5,000

10-500

Bandwidth: 3+ Mbps (dual T1)

Latency: < 100 ms

Bandwidth: 1.5 Mbps (T1)

Latency: <100 ms

10,000

1,000

Bandwidth: 3+ Mbps (dual T1)

Latency: <250 ms

Bandwidth: 1.5 Mbps (T1)

Latency: <500 ms

100,000

10,000

Bandwidth: 3+ Mbps (dual T1)

Latency: < 250 ms

Bandwidth: 1.5 Mbps (T1)

Latency: <500 ms

Overstepping these values will increase the page-load times dramatically, in 4 times at least. The critical bandwidth is 1.5 Mbps (T1) with 500ms latency.

Available network bandwidth and existed latency influences planning for geographic deployments in which data travels across WAN links that span multiple cities, states, provinces, countries, or continents.

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