Microsoft Office Communications Server 2007 R2, Group Chat Server
You may experience performance issues when you use a channel server in Microsoft Office Communications Server 2007 R2, Group Chat Server. These issues occur if one of the following conditions is true:
Many group chat clients try to access the group chat services at the same time.
Note This behavior may occur during regular logon operations at the start of a work day, or after a service outage during peak load. In this case, the group chat clients cannot connect to the group chat servers. Any chat rooms to which a user was connected appear disabled, and their status is set to Connecting. A notice is displayed on the status bar, and this notice indicates that the group chat domain is not available.
The compliance service is enabled.
You add a new group chat server to the pool to increase the capacity of the pool.
You have many chat rooms that are configured to send out invitations to users who are currently not in the chat room.
Note In this situation, the performance of each group chat server is significantly affected. This behavior reduces the number of users that each server can support and the rate at which these users can connect to the servers. Additionally, the average time that is required to deliver messages to other users in the chat room increases.
You have many categories and chat rooms. These categories and chat rooms are configured so that the number of access control entries that are used to define permissions increase significantly.
Note When this behavior occurs, the stored procedure that is used to load the state from the database times out, and the channel server does not start.
To resolve this issue, apply the following update:
969819 Update for Office Communications Server 2007 R2, Group Chat Server and Group Chat Compliance Servers: July 2009