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8 Exchange s Search for High Availability
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After the new database copy is seeded, the Store begins the process of resynchronizing it with the active copy. Exchange will copy the EDB and transaction log files from the server that hosts the active copy and you should see the copy status change to Healthy when seeding is complete. During this period the copy queue length decreases first, followed by a decrease in the replay queue length as Exchange synchronizes the new database copy. Eventually, the two queues will reduce to zero and the new database copy is fully up to date. Databases that do not use circular logging could have thousands of log files that the Store on the receiving server has to copy, inspect, and potentially replay to fully synchronize the new server. If you monitor the status of the database copy, you ll see that the copy queue length will increase as the logs are replicated from the active copy to the new copy and then decrease after all the current logs have been copied. You will then see an increase in the replay queue followed by a reduction to zero as the database copy becomes fully resynchronized and moves into a healthy state. This process is easier if you reduce the number of transaction logs that are involved by creating the new database copy soon after a full backup is taken of the active database. Successful completion of a full backup truncates the log set and reduces the synchronization requirement.
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Figure 8-17 Selecting a server to host a database copy.
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Day-to-day DAG management and operations
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Handling initial seeding errors
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It is possible that a seeding error will occur when you attempt to create a new database copy. Typically, this occurs when Exchange attempts to copy the EDB file from the server that hosts the active database copy to the server where you want to host the new copy. The first thing to do after such an error is to check that the servers are online and working as normal. The next is to check the errors recorded by Exchange when it attempted to create the database copy. To do this, select the database and view its properties. On the Status tab, click View Errors as shown in Figure 8-18. In this instance, we can see that the problem caused the database copy not to be created on the host server because its corresponding EDB file cannot be found. You can attempt to update the database copy but this is unlikely to succeed if the basic database files do not exist. The solution is therefore to remove the database copy (which only exists as an entry in the Exchange configuration in Active Directory) and restart the process to add a new database copy.
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Figure 8-18 Checking errors recorded when seeding a new database copy.
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If the database files exist for the new copy it s possible that some transient error interrupted seeding. In these instances, you can resume replication. Select the database copy and then select the Resume Database Copy option to instruct Exchange to recommence replication. EMC will warn you with an explanation of why replication was suspended and request confirmation to proceed (Figure 8-19). Click OK to resume replication and check that the new database copy moves to a healthy state as the transaction logs are replicated from the active copy and replayed into the passive.
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8 Exchange s Search for High Availability
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Name --------PR\ExServer1
Figure 8-19 Resume a seeding operation.
Monitoring database copies
On an ongoing basis you can browse the set of databases with EMC to check that all databases and their copies are in good health. Alternatively, it s much faster to use the GetMailboxDatabaseCopyStatus cmdlet to report the current replication status of databases. For example, here s the output returned from scanning for replication status for all mailbox servers in a DAG:
Get-MailboxServer | Where {$_.DatabaseAvailabilityGroup eq "DAG1"} | Get-MailboxDatabaseCopyStatus
Status -------Mounted Mounted Mounted Healthy Healthy Mounted Mounted Mounted Healthy Mounted Healthy Healthy Healthy Healthy Healthy Healthy Healthy Healthy
CopyQueue Length ---------0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ReplayQueue Length ---------0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
LastInspectedLogTime ---------------------
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