Policy-Based Data Replication
System Administration Manual
340
1.
Shut down the database to bring it into a consistent or quiescent state.
2.
Take a snapshot of the file system using a snapshot rule.
3.
Restart the database.
To backup data from the replication target
The post-replication script can be used to perform incremental (or full) backups from the
replication target after each incremental replication has completed. Backing up from the
replication target (rather than the original volume or directory) minimizes the performance
impact on network users.
After a replication copy has succeeded, the snapshots associated with previous copies on the
source can be deleted. However, it is very important not to delete the snapshot associated with
the last successful copy until the next successful copy has been completed.
Updating the "latest" snapshot
If the contents of the replication target are being shared or exported through the
Latest
Snapshot
then is may be desirable to update the view of the target after the replication is
complete. The latest snapshot shows the contents of the most recently created snapshot on the
file system. While a replication is in progress no changes currently being recorded will appear in
the shared or exported snapshot. Once the replication is complete, a post-replication script can
take a new snapshot on the target file system. This will result in an immediate update of the
view of the shared or exported latest snapshot, giving immediate access to the updates made by
the replication.
Replication Rules
The
Replication Rules
page lists all existing rules and allows new rules to be created.
Replication rules are optional configuration parameters that allow replications to be tuned to
enable or disable specific functions or to achieve optimal performance.
Using Replication rules allow control of values such as the number of read-ahead processes,
minimum file size used in block replication, when snapshots are deleted and if replications will
include migrated files. The Titan SiliconServer is configured with default values which should be
optimal in most cases. However, these values can be changed to customize replication
performance characteristics based on the data set.
To view the Replication Rules
From the
Home
page, click
Data Protection.
Then, click
Replication Rules.