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The database copy is disconnected from the active database copy. When it was disconnected it was in the Resynchronizing state. This status may be reported during DAG network failures between the source copy and the target database copy. The active copy is offline and not accepting client connections. The active copy is going offline and terminating client connections. The database copy is in a Failed state and it isn t able to copy or replay log files. In this state, the system will periodically check whether the problem that caused the copy status to change to Failed has been resolved and attempt to automatically resume. The Failed and Suspended states have been set simultaneously by the system because a failure was detected, and resolution of the failure explicitly requires administrator intervention. The database copy is successfully copying and replaying log files. The system is verifying that the database and log stream are in a consistent state. This state occurs when a database copy is created; when the Microsoft Exchange Replication service is starting; and during transitions from Suspended, ServiceDown, Failed, Seeding, or SinglePageRestore to another state. The active copy is online and accepting client connections. The active copy is coming online and not yet accepting client connections. The database copy and its log files are being compared with the active database copy to check for divergence. The database copy is being seeded, the content index for the mailbox database copy is being seeded, or both are being seeded. After seeding is successful, the copy status changes to Initializing.

The database copy is being used as a source for a database copy seeding operation. The Microsoft Exchange Replication service is not running on the server that hosts the mailbox database copy. This state indicates that a single page restore operation is occurring on the database copy. The database copy is in a Suspended state as a result of an administrator manually suspending the database copy by running the Suspend-MailboxDatabaseCopy cmdlet.

Conversely, the Web Forms model and available RAD tools make it particularly seductive to create page code that just works Within Visual Studio, you can quickly drag a control from the toolbox onto the form, edit content, and have some stub code generated for you to extend with database commands and any required logic More advanced design patterns such as Model-View-Presenter (MVP) are certainly neither prohibited nor blasphemous, but for one reason or another very few developers apply it..

In some instances, such as during maintenance, you many need to suspend and resume continuous replication activity for a database copy. The transaction logs do not truncate the active mailbox database copy when one or more passive copies are suspended. During an extended maintenance period this may result in a large number of transaction logs accumulating in your transaction log directory. In these cases, you may opt to remove the affected passive database copy instead of suspending it. When the maintenance is complete, you can re-add the passive database copy.

When deploying a CCR environment in Exchange 2007, the sizing was straightforward the databases were running on one node or the other. In Exchange 2010, which offers you the ability to have 16 members with up to 1,600 databases, sizing and designing the layout is far more complex. The obvious rule is that the more servers you have in a DAG the more options you have for laying out your database copies efficiently and resiliently. Consider the implications of a three-copy, six-server DAG versus two DAGs with three servers and three copies of each database. More servers in a single DAG give you more flexibility in creating copies and to balancing load. To illustrate, if a single server fails with three active databases in a three-member DAG, the two remaining servers need to service the load from the first server, as shown in Figure 11-10. As compared to two 3-member DAGs, a 6-member DAG can more effectively spread the results of failure across multiple servers as well as to sustain more member failures.

Thanks to everyone on Team DirectX and our partners for helping to make HLSL successful, but most especially, thanks to all our customers, who provide the motivation and inspiration for everything we do. Chas. Boyd DirectX Graphics Architect Microsoft Corporation May 1, 2003

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Note Best intentions don t always go hand in hand with the realities of schedules and budgets. Applying good design practices to ASP.NET Web Forms requires you to break the existing cycle a bit and provide your own framework. Often, though, it turns out to be too much work. We ll fix it later is the mantra. Just get it working now is what we re told by stakeholders more often than not.

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