First we need to suspend replication for the mailbox database copy on this server. The duration of the seeding process will depend on the size of the database and the speed of the network. When the update has completed it will automatically resume replication for the database copy. If you want to prevent automatic resume of replication use this command instead. The database should now be being copied over and once done depending on the command you chose from the above you should eventually see the database change from seeding back to a nice healthy database again.
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Then after the recovery process, users can extract the Exchange database mailboxes and export recovered EDB mailboxes to Live Exchange Server mailboxes in a simplified manner without any hindrance. So, to avoid the data loss due to corruption it is suggested to use the advanced software to remove corruption from Exchange database without any loss of data.
Stay tuned to our updates and know many - WHAT? Get the Solution. The database copy that will become the active mailbox database must be healthy and current. Looking for other management tasks related to mailbox database copies?
Check out Manage mailbox database copies. You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "Mailbox database copies" entry in the High availability and site resilience permissions topic.
For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts in the Exchange admin center. Having problems? Ask for help in the Exchange forums. SecondCopy : This is the default value when you add the second copy of a mailbox database.
When this value is set, at least one passive database copy must meet the Data Guarantee API conditions. When the Data Guarantee API is executed to evaluate the health of the database copy infrastructure, several items are evaluated. Have an average copy queue length less than 10 logs. The average copy queue length is computed based on the number of times the application has queried the database status. The Data Guarantee API can also be used to validate that a prerequisite number of database copies have replayed the required transaction logs.
This is verified by comparing the last log replayed timestamp with that of the calling service's commit timestamp in most cases, this is the timestamp of the last log file that contains required data plus an additional five seconds to deal with system time clock skews or drift. If the replay timestamp is greater than the commit timestamp, the DataMoveReplicationConstraint parameter is satisfied. If the replay timestamp is less than the commit timestamp, the DataMoveReplicationConstraint isn't satisfied.
Before moving large numbers of mailboxes to or from replication databases within a DAG, we recommend that you configure the DataMoveReplicationConstraint parameter on each mailbox database according to the following:. Due to the inherent nature of DAGs, as the result of database switchovers and failovers, active mailbox database copies will change hosts several times throughout a DAG's lifetime.
As a result, DAGs can become unbalanced in terms of active mailbox database copy distribution. The following table shows an example of a DAG that has four databases with four copies of each database for a total of 16 databases on each server with an uneven distribution of active database copies. In the preceding example, there are four copies of each database, and therefore, only four possible values for activation preference 1, 2, 3, or 4.
The Preference count list column shows the count of the number of databases with each of these values. For example, on EX3, there are 13 database copies with an activation preference of 1, two copies with an activation preference of 2, one copy with an activation preference of 3, and no copies with an activation preference of 4.
As you can see, this DAG isn't balanced in terms of the number of active databases hosted by each DAG member, the number of passive databases hosted by each DAG member, or the activation preference count of the hosted databases. You can use the RedistributeActiveDatabases.
This script moves databases between their copies in an attempt to have an equal number of mounted databases on each server in DAG. If required, the script also attempts to balance active databases across sites. BalanceDbsByActivationPreference : When this option is specified, the script attempts to move databases to their most preferred copy based on activation preference without regard to the Active Directory site.
BalanceDbsBySiteAndActivationPreference : When this option is specified, the script attempts to move active databases to their most preferred copy, while also trying to balance active databases within each Active Directory site. After running the script with the first option, the preceding unbalanced DAG becomes balanced, as shown in the following table. As shown in the preceding table, this DAG is now balanced in terms of number of active and passive databases on each server and activation preference across the servers.
The following table lists the available parameters for the RedistributeActiveDatabases. This example redistributes and balances the active mailbox database copies in a DAG using activation preference without prompting for input.
This example redistributes and balances the active mailbox database copies in a DAG using activation preference, and produces a summary of the distribution. You can view a variety of information, including copy queue length, replay queue length, status, and content index state information, by examining the details of a database copy in the EAC. You can also use the Get-MailboxDatabaseCopyStatus cmdlet in the Exchange Management Shell to view a variety of status information for a database copy.
A database copy is your first defense if a failure occurs that affects the active copy of a database. It's therefore critical to monitor the health and status of database copies to ensure that they are available when needed. For more information about monitoring database copies, see Monitor database availability groups. After removing a database copy, you must manually delete any database and transaction log files from the server from which the database copy is being removed.
For detailed steps about how to remove a database copy, see Remove a mailbox database copy. The Mailbox server that hosts the active copy of a database is referred to as the mailbox database master. The process of activating a passive database copy changes the mailbox database master for the database and turns the passive copy into the new active copy. This process is called a database switchover. In a database switchover, the active copy of a database is dismounted on one Mailbox server and a passive copy of that database is mounted as the new active mailbox database on another Mailbox server.
When performing a switchover, you can optionally override the database mount dial setting on the new mailbox database master. You can quickly identify which Mailbox server is the current mailbox database master by reviewing the right-hand column under the Database Copies tab in the EAC. There are several internal checks that will be performed before a passive copy is activated. In some cases, the database switchover is blocked or canceled.
In other cases, you can use cmdlets to move or skip over some checks. The status of the database copy is checked. If the database copy is in a failed state, the switchover is blocked. You can override this behavior and bypass the health check by using the SkipHealthChecks parameter of the Move-ActiveMailboxDatabase cmdlet.
This parameter lets you move the active copy to a database copy in a failed state. The active database copy is checked to see if it's currently a seeding source for any passive copies of the database. If the active copy is currently being used as a source for seeding, the switchover is blocked. You can override this behavior and bypass the seeding source check by using the SkipActiveCopyChecks parameter of the Move-ActiveMailboxDatabase cmdlet.
This parameter allows you to move an active copy that's being used as a seeding source. Using this parameter will cause the seeding operation to be cancelled and considered failed. The copy queue and replay queue lengths for the database copy are checked to ensure their values are within the configured criteria.
Also, the database copy is verified to ensure that it isn't currently in use as a source for seeding. If the values for the queue lengths are outside the configured criteria, or if the database is currently used as a source for seeding, the switchover is blocked. This parameter allows a copy to be activated that has replay and copy queues outside of the configured criteria.
The state of the search catalog content index for the database copy is checked. If the search catalog isn't up to date, is in an unhealthy state, or is corrupt, the switchover is blocked. You can override this behavior and bypass the search catalog check by using the SkipClientExperienceChecks parameter of the Move-ActiveMailboxDatabase cmdlet. This parameter causes this search to skip the catalog health check. If the search catalog for the database copy you're activating is in an unhealthy or unusable state and you use this parameter to skip the catalog health check and activate the database copy, you will need to either crawl or seed the search catalog again.
When you perform a database switchover, you also have the option of overriding the mount dial settings configured for the server that hosts the passive database copy being activated. Using the MountDialOverride parameter of the Move-ActiveMailboxDatabase cmdlet instructs the target server to override its own mount dial settings and use those specified by the MountDialOverride parameter.
For detailed steps about how to perform a switchover of a database copy, see Activate a mailbox database copy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful?
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