In the recent weeks I've worked several cases where Exchange 2007 SP1 Single Copy Clusters with storage groups enabled for Standby Continuous Replication on Windows 2008 have had performance and network connectivity issues. These issues have manifested themselves with the following symptoms:
In each case the following was common to all the situations I worked.
The following was performed to resolve the stability issues. Note: All steps are considered part of the solution.
1) Upgrade network interface drivers to a revision July 2008 or newer.
2) Reconfigure all network teams for Fault Tolerance Only.
3) Install KB 955733 to all clustered nodes.
This kb article corrects known issues with status codes returned by the Windows operating system for certain function calls. Note that when downloading the fix it is marked as Vista x64 although the fix is for Windows 2008 x64.
4) Open a case with Microsoft CSS - Request Exchange interim update KB957834. (Recommend that customers upgrade to Exchange 2007 SP1 RU5 and deploy the RU5 IU). This article can be found at: http://support.microsoft.com/kb/955733
This update is available for Exchange 2007 SP1 RU4 and Exchange 2007 SP1 RU5 at this time. This update corrects issues with share endpoint checking for servicing SCR. For more information regarding the replication service and shares see http://blogs.technet.com/timmcmic/archive/2008/12/23/exchange-replication-service-exchange-2007-sp1-and-windows-2008-clusters.aspx