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In earlier versions of Exchange Server, you could create multiple databases that used a single set of log files. These collections were called storage groups and were allowed so that databases could be kept smaller and more manageable. However, because of the limited cache memory available in 32-bit versions of Exchange Server, only four storage groups with a maximum of 20 databases could be created on a single server. Storage groups continue to exist in Exchange Server 2007; however, having multiple databases in a single storage group is generally discouraged or prohibited in many configurations. With the ability to create up to 50 storage groups and as many databases on a single server, the best practice is to never create more than one database in each storage group, but rather create a storage group for each database. In Exchange Server 2010, storage groups have been completely eliminated. Now each set of transaction log files only supports one mailbox or one public folder database. Not only have the storage groups been eliminated, but databases are also no longer specifically owned by any single server. All of the database objects now reside within a single database container for the entire Exchange organization. In the Exchange Server versions 2000, 2003,

and 2007, a database name only had to be unique within a storage group. A database could be distinguished by the server it was created on and the storage group it was created within, as shown in Figure 6-3. Because of this many companies could have rightly used the same database names multiple times across the entire Exchange organization.

Description: Jump to the instruction following the label if the contents of the Boolean register are True. Syntax: callnz label, booleanRegister Operation:

In Exchange 2010 databases are no longer tied to a specific server. Therefore, each mailbox database name must be unique across the entire organization, as shown in Figure 6-4. This means that proper attention must be given to creating a naming standard that works for your organization. The best practices for creating a naming standard for an organization are discussed in further detail in 3, Exchange Environmental Considerations.

The action invoker is built around the IActionInvoker interface. The interface is fairly simple it exposes just one method:

Exchange Server 2003 also introduced the Recovery Storage Group feature; this feature enables an administrator to restore database backups into a special storage group for recovery. This functionality still exists within Exchange 2010; however, with the removal of storage groups it is now called a recovery database (RDB). The functionality and best practices for using RDBs are covered in 12, Backup/Restore and Disaster Recovery.

The overall theme for the storage changes in Exchange Server 2010 was to move away from doing many random, small, disk IOs to a few sequential, large, disk IOs. A number of changes were done to accomplish this, such as a larger page size, improved data contiguity, and more intelligent I/O operations. The importance of optimizing I/O can be better understood by reviewing how disk technology functions. Random disk I/O is bound by the speed at which the disk head can

Acts as a smart host and SMTP relay in your perimeter network and handles all Internet-facing mail flow. Provides anti-spam and antivirus functionality. Provides address rewriting and Transport rules to protect the internal network. Connects Exchange with your telephone system or private branch exchange (PBX) to provide voice access to your mailbox.

public interface IActionInvoker { bool InvokeAction(ControllerContext controllerContext, string actionName); }

Supports a maximum of 100 concurrent calls per server. The planning aspect should include the number of users and how they use Unified Messaging. A single Unified Messaging server can host approximately 3,000 users. You need at least one Hub Transport server available in the same site.

Exchange Server 2010 server roles can coexist on a single Exchange computer with a few rules to consider:

if (specified boolean register is not zero) { Push address of the next instruction to the return address stack. Continue execution from the instruction marked by the label. }

Although the overall behavior of an action is clear, the specific steps it performs depend on the implementation and context. A few tasks, however, are common to any implementation.

The Mailbox role, Hub Transport role, Client Access role, and Unified Messaging role can coexist on a server. On a Mailbox server that is member of a DAG, you cannot use Windows Network Load Balancing (NLB). Edge Transport cannot be shared with any other server role.

In a smaller organization you will probably end up having a server that hosts multiple roles, mainly the Mailbox, Client Access, and Hub Transport roles. The larger the organization, the more dedicated those server roles will get. Notes from the field

hen I prepare to install a new Exchange messaging system or integrate with an earlier version of Exchange I always take the same approach.