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Using cross-site direct connect is often suitable when a single mailbox server is undergoing maintenance or there are other temporary issues that will be resolved in a short period of time. Redirection may be needed when multiple systems or the entire datacenter will undergo maintenance. Performing a redirection switchover will force the clients to reconnect to the secondary site and allow maintenance to be completed. If redirection is used to switch over, it will also be done to perform the switchback to allow the clients to reconnect to the primary site. To enable cross-site direct connect, run Set-DatabaseAvailabilityGroup <DAG Name> -AllowCrossSiteRpcClientAccess: $true from the EMS. Conversely, to disable cross-site direct connect, run Set-DatabaseAvailabilityGroup <DAG Name> -AllowCrossSiteRpcClientAccess: $false from the EMS. To determine whether cross-site direct connect is enabled, run GetDatabaseAvailabilityGroup <DAG Name> | Format-List as shown in Figure 11-17.

To prepare for activating a secondary site in the case of a primary site failure, you must enable datacenter activation coordination (DAC) mode on the DAG by running Set-DatabaseAvailabilityGroup <DAG Name> -DatacenterActivationMode:DagOnly. Also in preparation you should also set the alternate witness server and alternate witness directory for a server available in the second site. This allows an administrator to activate the site even if a majority DAG members remain unavailable in the failed site, and it prevents split-brain scenarios. The Active Directory site defines the datacenter boundaries; therefore, to enable DAC mode, the DAG must span at least two sites. A datacenter failure is a catastrophic event because such a failure requires an administrator to make the decision to perform a full datacenter switchover, because the process is not automatic. The datacenter switchover process includes the following steps:

Not all actions should be considered for an asynchronous behavior Only I/O-bound operations are, in fact, good candidates to become asynchronous action methods on an asynchronous controller class An I/O-bound operation is an operation that doesn t depend on the local CPU for completion When an I/O-bound operation is going on, the CPU just waits for data to be processed (for example, downloaded) from external storage such as a database or a remote Web service Operations in which the completion of the task depends on the activity of the CPU are, instead, referred to as CPU-bound The typical example of an I/O-bound operation is the invocation of a remote Web service In this case, the real work is being done remotely by another machine and another CPU The ASPNET thread would be stuck waiting and be idle all the time.

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Evaluate the situation and then decide to perform a datacenter switchover. Configure the DAG to remove the primary site s servers from the Windows Failover Cluster, but retain them in the DAG. This is done by running StopDatabaseAvailabilityGroup <DAG Name> ActiveDirectorySite <Primary Site Name> -ConfigurationOnly in the primary site, if possible. Configure the DAG to use an alternate witness server and restore the functionality in the secondary site. To do this, first stop the cluster service on each of the secondary site s DAG s servers, and then run Restore-DatabaseAvailabilityGroup <DAG Name> -ActiveDirectorySite <Secondary Site Name>.

Start the cluster service on each of the servers in the DAG in the secondary site. The remaining Active Managers will then coordinate mounting databases in the secondary site. Adjust DNS records, if necessary, for Simple Mail Transfer Protocol (SMTP), OWA, Autodiscover, and Outlook Anywhere. These adjustments can be done manually or automatically using a third-party global-server load balancer.

Releasing that idle thread from the duty of waiting, and making it available to serve other incoming requests, is the performance gain you can achieve by using asynchronous actions or pages It turns out that not all lengthy operations give you a concrete benefit if they re implemented asynchronously A lengthy in-memory calculation, for example, doesn t provide you with any significant benefit if they re implemented asynchronously because the same CPU both serves the ASPNET request and performs the calculation On the other hand, if remote resources are involved (or even multiple resources), using asynchronous methods can really boost the performance of the application, if not the performance of the individual request.

After the primary site is recovered you may choose to perform a switchover to the primary site. This process includes the following steps:

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