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This topic has one disclaimer: It does not apply to a single node failure in a cluster This is because a new node can be added to replace the failed node without impacting service levels So when we talk about failed server recovery, we are talking about an Exchange server with one or more Exchange roles installed that must be restored in order to recover the appropriate service levels in an organization There are many reasons a server could become unavailable Here are the three most common: Server hardware failure Facility/site failure Software/data corruption In general, you can recover a specific server by restoring the system state with a full Exchange backup set or by using the Setup /m:RecoverServer procedures Although a system state backup has the potential to be the fastest recovery plan, it lacks flexibility The system state restore requires the exact same hardware configuration so that when the Registry is restored there are no invalid configurations At an installation for a client, I restored a system state backup of a machine that was made before a hardware upgrade Immediately following the restore the system hard drive became unavailable because the RAID controller drivers and parameters in the Registry were invalid If you do not keep your system state backups up to date after each hardware change, they become a liability as opposed to an asset The Exchange Setup utility, on the other hand, can be used to recover a server regardless of the hardware changes This is because the configuration information for the Mailbox server, Hub Transport server, Client Access Server, and Unified Messaging server roles is stored in Active Directory The setup utility pulls the configuration from Active Directory when the /M:RecoverServer option is invoked If you have to purchase a new server or utilize an existing server to restore your Exchange 2007 server, you will want to use the Exchange Setup /m:RecoverServer option Before you use this option, you must make sure you have no plans of bringing the server you are replacing back online
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Before a new computer can take the place of the failed Exchange 2007 server, you must reset the computer account in Active Directory Resetting the computer account will allow the new server to join the domain without losing all the permissions and configurations associated with the failed server You never want to delete the existing computer object for the failed server because this will purge Active Directory of the critical Exchange Server data Follow these steps to reset the computer account: 1 Open Active Directory Users and Computers 2 Navigate to the computer object for the lost server By default, it will be in the Computers container 3 Right-click the server name and select Reset Account
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The server that you use to replace the failed server doesn t have to have exact matching hardware However, it is a good idea to use equivalent or better hardware Also, you need to configure the server with the same number of disk drives (LUNs) as the original server and assign the disks with the same drive letters so that the recovered configuration data matches the available paths This includes connecting it to the same SAN if one exists Connecting back to the SAN can be tricky with new hardware The new host bus adapter (HBA) will have a different world wide number (WWN) from the failed server Check with your SAN vendor on how to register the new HBA and configure it to have access to the same LUNs as the failed server If you would like more detail on what a WWN is, see http://searchstoragetechtargetcom/expert/KnowledgebaseAnswer/0,289625,sid5_ gci1159703,00html Here are the steps to follow to build the replacement server: 1 Install Windows 2003 on the new server 2 Install all service packs and hotfixes that the failed server had applied Do not install patches that have not yet been applied to the failed server 3 Change the name on the server to be the failed server name 4 Join the Active directory domain of the failed server 5 Open Computer Management and navigate to Disk Management 6 Change the drive letters of each disk present in Disk Management to match the drives of the failed server 7 Insert the Exchange 2007 media Click Start | Run, type <SourceDrive>:\setup com /m:recoverserver (as shown next), and click OK
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Based on the configuration information available in Active Directory for the failed server, setup will perform a custom installation Specifically, the roles that were running on the failed server will be reinstalled Any customizations made locally on the failed server will be lost, however Once the recovery is complete you will need to manually reapply the custom settings to the server
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