Microsoft Exchange 2010 High Availability and Site Resilience Key Terms
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Address Book service
A service on the Client Access server that provides a directory access endpoint for Microsoft Outlook clients.
Continuous replication - block mode
A new form of continuous replication in SP1 whereby as each update is written to the active database copy's active log buffer, it's also shipped to a log buffer on each of the passive mailbox copies. When the log buffer is full, each database copy builds, inspects and creates the next log file in the generation sequence.
Continuous replication - file mode
The name for the original form of continuous replication in the release to manufacturing (RTM) version of Exchange 2010, whereby closed transaction log files are pushed from the active database copy to one or more passive database copies.
Database availability group (DAG)
A group of up to 16 Exchange 2010 Mailbox servers that hosts a set of replicated databases.
- The ability of a single Exchange 2010 mailbox database to be replicated to and mounted on other Exchange 2010 Mailbox servers.
- In Exchange 2007, a feature called database portability also enabled you to move a mailbox database between servers. A significant distinction between database portability and database mobility, however, is that all copies of a database have the same GUID.
Any process used to manually recover from a failure. This can be a failure that affects a single item, or it can be a failure that affects an entire physical location.
Exchange third-party replication API
An Exchange-provided API that enables use of third-party synchronous replication for a database availability group instead of continuous replication.
A solution that provides service availability, data availability, and automatic recovery from failures that affect the service or data (such as a network, storage, or server failure).
The ability to deploy high availability and site resilience after Exchange 2010 is installed.
Lagged mailbox database copy
A passive mailbox database copy that has a log replay lag time greater than zero
Mailbox database copy
A mailbox database (.edb file and logs), which is either active or passive.
The name of a unified high availability and site resilience solution in Exchange 2010.
RPC Client Access service
A service on the Client Access server that provides a MAPI endpoint for Microsoft Outlook clients.
A manual disaster recovery process used to activate an alternate or standby datacenter when the primary datacenter is no longer able to provide a sufficient level of service to meet the needs of the organization. Also includes the process of re-activating a primary datacenter that has been recovered, restored or recreated. You can configure your messaging solution for high availability and enable site resilience using the built-in features and functionality in Exchange 2010.
A transport server feature that provides redundancy for messages for the entire time they are in transit.
*over (pronounced "star over")
Short for switchovers and failovers. A switchover is a manual activation of one or more database copies. A failover is an automatic activation of one or more database copies after a failure.
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