Monitoring a data workload

When a source is highlighted in the left pane of the Replication Console, the connections and their statistics are displayed in the right pane. Additionally, colors and icons are used for the connections, and the Double-Take Availability servers, to help you monitor your connections.

Connection statistics

You can change the statistics that are displayed by selecting File, Options and selecting the Statistics tab.
The statistics displayed in the Replication Console will be listed with check boxes to the left of each item. Mark the check box to the left of each statistic that you want to appear, and clear the check box to the left of each statistic that you do not want to appear.
The statistics appear on the Replication Console in the order they appear on the Statistics tab. If you want to reorder the statistics, highlight the statistic to be moved and select the up or down arrow button, to the right of the vertical scroll bar, to move the selection up or down in the list. Repeat this process for each statistic that needs to be moved until you reach the desired order.
If you have made changes to the statistics list and have not yet saved them, you can go back to the previously used settings by clicking Reset to Last. This will revert the list back to the last saved settings.
To return the statistics list to the Double-Take Availability default selection and order, click Reset to Default.
Click OK to apply and save any changes that have been made to the order or display of the Replication Console statistics.

Statistics marked with an asterisk (*) are not displayed, by default.

Replication Set

Replication set indicates the name of the connected replication set.

Connection ID

The connection ID is the incremental counter used to number each connection established. This number is reset to one each time the Double-Take service is restarted.

Target Name

The name of the target as it appears in the server tree in the left pane of the Replication Console. If the server’s name is not in the server tree, the IP address will be displayed.

Target IP

The target IP is the IP address on the target machine where the mirroring and replication data is being transmitted.

Target Data State

OK—The data on the target is in a good state.
Mirroring—The target is in the middle of a mirror process. The data will not be in a good state until the mirror is complete.
Mirror Required—The data on the target is not in a good state because a remirror is required. This may be caused by an incomplete or stopped mirror or an operation may have been dropped on the target.
Restore required—The data on the source and target do not match because of a failover condition. Restore the data from the target back to the source. If you want to discard the changes on the target, you can remirror to resynchronize the source and target.
Not Ready—The Linux drivers have not yet completed loading on the target.

Target Status

OK—The target machine is active and online.
Not Loaded—The target module is not loaded on the target. (For example, the activation code is invalid.)
Paused—The target machine is paused by user intervention.
Retrying—The target machine is retrying operations for the connection.

This field may not be updated until there is source/target activity.

Commit Mode *

The commit mode status indicates the connection status.

Real-time—Data is being transmitted to the target machine in real-time.
Scheduled—Data is waiting to be transmitted to the target machine until one or more transmit options have been met.

Transmit Mode

Started—Data is being transferred to the target machine.
Paused—If the transmission is real-time and the transmission has been paused, the Transmit Mode indicates Paused.
Scheduled—If the transmission is scheduled, the Transmit Mode indicates Scheduled.
Stopped—Data is not being transferred to the target machine.
Error—There is a transmission error.

Mirror Status

Mirroring—If the file size of the replication set has not been calculated and the data is being mirrored to the target machine, the Mirror Status will indicate Mirroring.
Idle—Data is not being mirrored to the target machine.
Paused—Mirroring has been paused.
Percentage Complete—If the file size of the replication set has been calculated and the data is being mirrored to the target machine, the Mirror Status will display the percentage of the replication set that has been sent.
Waiting—Mirroring is complete, but data is still being written to the target.
Restoring—Data is being restored from the target to the source.
Verifying—Data is being verified.
Removing Orphans—Double-Take Availability is checking for orphan files within the target path location (files that exist on the target but not on the source). These files will be removed.

Replication Status

Replicating—Data is being replicated to the target machine.
Ready—There is no data to replicate to the target machine.
Stopped—Replication has stopped.
Pending—If auto-remirror is enabled and you have experienced a source or target failure and recovery, the status will change to pending while the connections are reestablished and will update when the remirror begins. If auto-remirror is disabled and you have experienced a source or target failure and recovery, replication will be Pending until a remirror is performed. Without a remirror, data integrity cannot be guaranteed.
Out of Memory—Kernel memory has been exhausted.

Queued (Ops) *

The queued (ops) statistic indicates the total number of mirror and replication operations that are in the source queue.

Sent (Bytes)

The sent (bytes) statistic indicates the total number of mirror and replication bytes that have been transmitted to the target.

Sent Compressed (Bytes)

The sent compressed (bytes) statistic indicates the total number of compressed mirror and replication bytes that have been transmitted to the target. If compression is disabled, this statistic will be the same as sent (bytes).

Intermediate Queue (Bytes) *

The intermediate queue (bytes) indicates the total amount of memory being used by the operations buffer queue.

Disk Queue (Bytes)

The disk queue (bytes) indicates the amount of disk being used to queue data on the source.

Queued Replication (Bytes)

The queued replication (bytes) statistic is the total number of replication bytes that are remaining to be transmitted from the source.

Sent Replication (Bytes)

The sent replication (bytes) statistic is the total number of replication bytes that have been transmitted to the target.

Sent Compressed Replication (Bytes) *

The sent compressed replication (bytes) statistic is the total number of compressed replication bytes that have been transmitted to the target. If compression is disabled, this statistic will be the same as sent replication (bytes).

Queued Mirror (Ops) *

The queue mirror (ops) statistic is the total number of mirror operations in the queue.

Sent Mirror (Bytes)

The sent mirror (bytes) statistic is the total number of mirror bytes that have been transmitted to the target.

Sent Compressed Mirror (Bytes) *

The sent compressed mirror (bytes) statistic is the total number of compressed mirror bytes that have been transmitted to the target. If compression is disabled, this statistic will be the same as sent mirror (bytes).

Skipped Mirror (Bytes)

The skipped mirror (bytes) statistic is the total number of bytes that have been skipped when performing a difference or checksum mirror. These bytes are skipped because the data is not different on the source and target machines.

Remaining Mirror (Bytes)

The remaining mirror (bytes) statistic is the total number of mirror bytes that are remaining to be sent to the target.

Queued Replication (Ops) *

The queued replication (ops) statistic is the total number of replication operations in the queue.

Last File Touched

The last file touched identifies the last file that Double-Take Availability transmitted to the target. If you are using long file names (more than several thousand characters long) you may want to disable the display of this statistic to improve Replication Console response times.

Connected Since

Connected since is the date and time indicating when the current connection was made. This field is blank, indicating that a TCP/IP socket is not present, when the connection is waiting on transmit options or if the transmission has been stopped. This field will maintain the date and time, indicating that a TCP/IP socket is present, when transmission has been paused.

Connection and sever display

You can configure when the icons and colors change to accommodate your network environment. For example, a slow or busy network may need longer delays before updating the icons or colors.

Select File, Options. On the Configuration tab, you will see Site Monitor and Connection Monitor. The Site Monitor fields control the icons on the left pane of the Replication Console and the icons on the right pane when a group is highlighted in the left pane. The Connection Monitor field controls the display when a server is highlighted in the left pane. These two separate monitoring capabilities allow for flexible monitoring.
Under Site Monitor, specify Check Status Interval to identify the number of seconds between requests sent from the Replication Console to the servers in order to update the display. Valid values are between 0 and 3600. The default setting is 30 seconds.
Under Site Monitor, specify Missed Status Responses to identify the number of responses from a server that can be missed before the Replication Console considers communications lost and updates the icons. Valid values are between 1 and 100. The default setting is 2.
Under Connection Monitor, specify Missed Status Responses to identify the number of responses from a server that can be missed before the Replication Console considers communications lost and updates the icons and colors. Valid values are between 0 and 1000. The default setting is 5.
Click OK to save the settings.

If the Site Monitor and Connection Monitor settings are different, at times, the icons and color may not be synchronized between the left and right panes.

The following icons are displayed in the left pane.

—An icon with yellow and blue servers indicates a server that is working properly.

—A red X on a server icon indicates the Replication Console cannot communicate with that server or that is a problem with one of the server’s connections. If the connection background is gray, it is a communication issue. If the connection also has a red X, it is a connection issue.

—A red tree view (folder structure) on a server icon indicates a restore is required because of a failover.

—A black X on a server icon indicates the server is not running Double-Take Availability.

The following icons and colors are displayed in the right pane when a server is highlighted in the left pane.

—A green checkmark on a connection indicates the connection is working properly.

—A red X on a connection indicates a connection error. For example, an error may be caused by broken transmission or pending replication. To determine the exact problem, locate the connection data item that appears in red.

White background—If the connection background is white, the Replication Console and the source are communicating.

Gray background—If the connection background is gray, the Replication Console and the source are no longer communicating. The connection data stops updating once communications have stopped. Once communications have been reestablished, the connection background will change back to white.