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Replication Status and Modes

You can check the status of data replication using one of the following tools:

Use LogRhythm DR Control to Check Status

  1. From the Primary (active) Platform Manager, click StartAll ProgramsLogRhythm, and Disaster Recovery.
  2. Right-click DR Control, and then click Run as administrator. Enter your local system administrator credentials.
    A number of metrics will be available to provide a brief view of system health, these are as follows:
    • Synchronized. The active database is healthy and sending logs to the secondary node.
    • Synchronizing. The database transfer to the standby database is lagging behind the contents of the active database. This will be normal for Availability Groups utilizing Asynchronous Commit mode, which is the default mode for DR.
    • Not Synchronizing. There is an issue sending transfers between the primary and secondary database.
    • Suspended. The active database is available, but no data is transferring to the standby database.
    • Disconnected. The standby database is not available to receive transfers.
    • Unknown. Neither the active or standby databases are available.
    • SendQueue. Indicates the amount of log records in the log files (in KB) of the primary database that have not been sent to the secondary replica.
    • SendRate. Indicates the rate in KB per second at which log records are being sent to the secondary replica.
    • RedoQueue. Indicates the amount of log records in the log files(in KB) of the secondary replica that have not yet been redone.
    • RedoRate. Indicates the rate in KB per second at which the log records are being redone.
    • EsitmatedRecoveryTime. Indicates the time in seconds it takes to redo the catch-up time. The catch-up time is the time it will take for the secondary replica to catch up with the primary replica.
    • SyncPerformance. The size of the log SendQueue divided by the SendRate.
  3. To exit the panel, type Q.

Use AlwaysOn Availability Group Dashboard to View Status

  1. From the Primary (active) Platform Manager, start SQL Server Management Studio and log in as an administrator.
  2. Expand the AlwaysOn High Availability folder and the Availability Groups folder that it contains.
  3. Right-click the Availability Group whose status you want to view, and then click Show Dashboard.
    The dashboard appears.
  4. To display additional information in the dashboard, click the Add/Remove Columns link to the right of the Group By field.

You can find additional details about the AlwaysOn Dashboard here.

Replication Modes

You can select one of the following replication modes for transferring databases:

  • Asynchronous. (Default; recommended) Data transfer is acknowledged on the Primary site before being sent to the Secondary site. This method provides the best possible performance for peak times, while the slower periods allow the synchronization to catch up if it falls behind.
  • Synchronous. Data is committed to the Secondary site before the Primary site acknowledges the transfer. The speed of the Primary instance can only be as fast as the link between the two sites.
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