Microsoft Lync Server 2010 Support for Large Meetings (1000 users)

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Microsoft Lync Server 2010 can support large meetings with up to 1000 participants using audio/video (A/V) conferencing, including sharing PowerPoint presentations. This support requires a dedicated pool configured to support large meetings and managed in a way that ensures hosting of only a single large meeting at a time

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Test Observations

Our testing demonstrated that hardware that meets the Lync Server 2010 hardware recommendations was able to support large meetings with up to 1000 users. The following table summarizes the CPU and network utilization results of our testing for Front End Servers and A/V Conferencing Servers.

CPU and network utilization

Metric

Front End Servers

A/V Conferencing Servers

Peak CPU utilization

~ 23%

~47%

Peak network utilization

~ 70MB per second

~38MB per second

During testing, we observed that the number of participants in the meeting has an affect on the amount of time it takes for new clients to join a meeting, in addition to the amount of time it takes for existing clients to receive meeting roster updates after a new user joins. The increase in latency is proportional to the number of users in the meeting, as expected. The participant client experience was not optimal with 1000 users, but it was reasonable with all media modalities. The following table summarizes the time it takes forspecific meeting activities for Lync clients joining a meeting with 1000 users.

Time required for users joining a meeting with 1000 users

Media mix

Time to join A/V

Time to join data collaboration

Time to receive roster updates

Overall join time

1000 users using data collaboration, with 250 users using A/V

27 seconds

55 seconds

25 seconds

55 seconds

1000 users using data collaboration, with 750 users using A/V

39 seconds

62 seconds

43 seconds

62 seconds

1000 using data collaboration, with 1000 users using A/V

48 seconds

70 seconds

50 seconds

70 seconds