What is LCR for Exchange 2007? Local Continuous Replication.
It is a single server mailbox data redundancy solution and is an very easy and smart choice for smaller busnisses and small companies that either don’t need or cannot afford a complex cluster with more than one server. When you configure the server for to have a role as LCR server, it is quite necessary to have five volumes. What? FIVE VOLUMES? What for? I’ll show you now.
You will need this:
- C: Windows/Exchange Install – It’s volume for system and Exchange install.
- L: Logs active copy – volume for storing logs, the active part of the ‘mirror’
- M: Logs passive copy – volume for storing logs, the passive part of the ‘mirror’
- T: Database passive copy – copy of the active database
- S: Database active copy – copy of the passive database
If you have I/O issues you might also create more volumes for additional storage groups and and a volume for the Exchange install. To make failover and failback easier each storage group should be its own volume. Also, the active and passive files should be on separate disk systems attached to different storage controllers. Doing this helps to isolate any hardware problems to either the active or passive copies allowing the server to stay functioning. Lastly it is important to note that LCR adds a bit of memory overhead to the server. When sizing a LCR server its best to add an additional 1GB of RAM to the server to handle the LCR overhead. In this example we are going to install a Exchange server 2007 that I’l configure as a LCR server.
Start with a Windows 2003 Server x64 R2 server with SP2 (this makes install easier) Ensure that all IP subnets and sites are defined in Active Directory Run setup.com
Install the remaining prerequisites
- Windows PowerShell
- IIS 6.0 (Web services, do NOT install SMTP or NNTP)
- .NET Framework Update
- Start the install by clicking on Step 4 of the welcome screen.
If this is your first Exchange server in the forest you will be prompted for an Exchange organization name. Here it is typical to type in your company name or something a little more generic like “Corporate” or “Messaging” so as to not have to rename the organization in case of a company name change or in case of a merger.