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Recovering a CMS to a SCR Target Cluster Node
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If the SCR source and target are clustered, the following command is used to activate the SCR target:
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Setup /RecoverCMS /CMSName:"CMS Name of SCR Source" /CMSIPAddress:xxxx
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Once setup completes, the CMS is created on the standby cluster Databases can be mounted at this point using the EMC or the Mount-Database command from the shell Note that if the SCR target is in a different subnet (typically in a remote datacenter), the IP address used in the preceding command is likely to be a different IP address than the original CMS IP address, and may belong to a different subnet than the source server If the SCR source and target clusters are running on a Windows Server 2008 server, the HostTTLRecord property can be set on the Network Name resource of the CMS to change
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the TTL from its default of 20 minutes Microsoft recommends setting this to 5 minutes (300 seconds) A lower TTL allows quicker client connectivity to the CMS post-recovery The TTL should be changed after the CMS is set up on the source cluster, and after SCR activation on the standby cluster To set the TTL, use the clusterexe command line on Windows Server 2008:
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clusterexe res "CMSName" /priv HostRecordTTL=300
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Activating a Storage Group on the SCR Target
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The second recovery option uses Database Portability to mount the database on the SCR target AD accounts for users with mailboxes on the affected database are changed to point to the SCR target server using the Move-Mailbox command with the ConfigurationOnly option If the original server is still online and responding to requests, it redirects Outlook 2003 and later clients to the SCR target, where their mailboxes now reside If the original server is unavailable, Outlook profiles for the affected users may need to be modified to point them to the correct server Outlook 2007 clients rely on the Autodiscover service to locate their maiboxes automatically As soon as AD replication updates the change to the domain controllers used by Client Access Servers, these users can start Outlook and have access to their mailboxes
NOTE Detailed steps for activating the SCR target using database portability can be found at http://
technetmicrosoftcom/en-us/library/bb738132aspx
Summary
The high availability functionality in Exchange Server 2007 provides a number of new features (as well as enhancement to old ones) that allow organizations to ensure higher availability and to reduce downtime The built-in replication features can be used in different combinations to meet the high availability goals in organizations of all sizes, as detailed in the following table
Features and Requirements Storage and database redundancy Server redundancy Datacenter redundancy (site resilience) Uses Cluster Service Requires cluster-certified hardware (The entire solution should be on the Cluster solution category of Windows Server Catalog of Tested Products) Requires shared storage Requires Windows Server (2003/2008) Enterprise or Datacenter edition LCR Yes No No No No CCR Yes Yes Yes1 Yes No SCC No Yes No2 Yes Yes SCR Yes Yes Yes No3 No
No No
No Yes
Yes Yes
No4 No5
19:
H i g h Av a i l a b i l i t y
Features and Requirements Requires Exchange Server 2007 Enterprise edition Maximum number of nodes Maximum number of databases per storage group Supported on dissimilar hardware Automated failovers Uses Exchange Database Continuous Replication Supports multiple replication targets Supports configuration of lag times for log file replay and truncation Supports VSS backups from replica Uses Transport Dumpster Supports public folder replication Coexistence with other Exchange Server 2007 server roles
LCR No N/A 1 N/A No Yes No No Yes Yes9 No
CCR Yes 2 1 Yes Yes Yes No No Yes Yes No No
SCC Yes 8 5
SCR No5 N/A 1 N/A No Yes Yes Yes No No No Yes12
No Yes No8 N/A N/A N/A No Yes No
1 CCR can provide datacenter redundancy If the operating system is Windows Server 2003, both nodes need to be on the same subnet, thus requiring the subnet to be stretched using VLANs If you re using Windows Server 2008, both nodes can be on different subnets The placement of the File Share Witness should be considered carefully in such topologies, as mentioned earlier in this chapter 2 SCC does not provide datacenter redundancy out of the box Exchange databases, and generally the quorum, reside on shared storage Third-party solutions can be used to implement datacenter redundancy 3 SCR works with standalone or clustered source and target servers If the source or target servers are clustered, the Cluster Service is used SCR by itself does not require the Cluster Service 4 If the SCR source or targets are Clustered Mailbox Servers using SCC, they require shared storage 5 SCR source and target servers can be in a clustered environment using SCC or CCR All Exchange servers participating in a cluster require Windows Server 2003/2008 Enterprise or Datacenter edition, and Exchange Server 2007 Enterprise edition 6 Clustered Mailbox Servers can be set up in a cluster environment where more than two nodes exist in the cluster However, only two nodes can participate in CCR replication and become possible owners of a CMS As such, only two-node clusters are recommended with a Majority Node Set (MNS) quorum with File Share Witness 7 If a Clustered Mailbox Server using SCC is required to participate in SCR replication, SCR supports only one database per storage group
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