IMG 1010 - Redundant Node Cluster

Description:

The Redundant Node Cluster object is where the cluster is defined and the status of the cluster is displayed. Information such as which nodes are part of the cluster is defined in this object. See below for more information on configuring this object.

Accessing this Pane:

Dialogic IMG EMS > Redundant Node Clusters > New Redundant Node Cluster

Maximum Objects:

16 per Dialogic IMG EMS. One Backup Node for each Primary Node.

ClientView Pane:

Field Descriptions:

Name:

Click in the Name field and enter a name that will identify this Redundant Node Cluster. The default name given is 'Cluster1'.

Backup IMG (+1) Name:

The Backup IMG (+1) Name field has a drop down menu displaying all the 'backup' nodes created (+1 nodes). Select from drop down list which node configured as a Backup node will be used.

Switchover Delay (Min=120 seconds):

This is the length of time the Primary node must be down before an automatic switchover is initiated. To change, click in the Switchover Delay field and enter a new delay. The delay entered is in seconds.

Physical IMG at Interface 0:

Select from drop down menu which Primary IMG node will be backed up on Tx/Rx pair #0. The Tx/Rx pair are numbered on rear of DS3 IMG 1010 Backup node.

Physical IMG at Interface 1:

Select from drop down menu which Primary IMG node will be backed up on Tx/Rx pair #1. The Tx/Rx pair are numbered on rear of DS3 IMG 1010 Backup node.

Physical IMG at Interface 2:

Select from drop down menu which Primary IMG node will be backed up on Tx/Rx pair #2. The Tx/Rx pair are numbered on rear of DS3 IMG 1010 Backup node.

Physical IMG at Interface 3:

Select from drop down menu which Primary IMG node will be backed up on Tx/Rx pair #3. The Tx/Rx pair are numbered on rear of DS3 IMG 1010 Backup node.

Physical IMG at Interface 4:

Select from drop down menu which Primary IMG node will be backed up on Tx/Rx pair #4. The Tx/Rx pair are numbered on rear of DS3 IMG 1010 Backup node.

Physical IMG at Interface 5:

Select from drop down menu which Primary IMG node will be backed up on Tx/Rx pair #5. The Tx/Rx pair are numbered on rear of DS3 IMG 1010 Backup node.

Service State:

The service state field will Disable or Enable the backup node. In the Enable state, the backup node is "backing up" all the primary nodes in the cluster. When Disable is selected the backup node is no longer backing up the primary nodes. Disabling the backup node would commonly be done because maintenance such as software upgrade needs to be accomplished. When resetting the nodes during a software upgrade, the backup will not execute a switchover if Disable is selected.

Status Fields:

The next few fields display the status of different aspects of the Redundant Node Cluster. See below for information on each individual status field.

Cluster State:

Below is description of each state that the Node Cluster can get in to.

Creating - Initial state after creating the Redundant Node Cluster object. GCEMS is waiting for connectivity to the backup. Once connectivity is established, the state will transition to Discovery state.

Discovery - This state indicates there is connectivity to the backup node and the GCEMS is waiting for a response to queries sent. The GCEMS will then determine what state the Backup node is in (Offline/Standby/Switched Over).

Standby - The backup node is in standby state. In this state the backup node is not "backing up" any primary nodes. The Node Cluster Manager is waiting for a failure on one of the primary nodes to occur to initiate a switchover from one of the primary nodes to the backup node.

Offline - The backup node is in Offline state. The backup is not ready to backup any primary nodes. This is a typically displayed during a switchover. This state is a transition state between standby and active mode. Typically the Offline state is displayed during a switchover or switchback.

Waiting - The backup or primary node is waiting for a response to a query which would indicate whether to go to Offline state, Standby State, or Switched Over state. Typically the Waiting state is displayed during a switchover or switchback.

Connecting - The state the Node cluster reverts to when not connected to the Backup Node. Typically this state occurs during a switchback from backup to primary.

Awaiting Timeout - This state indicates a primary node has failed and a timer has been started. Typically the Awaiting Timeout state occurs during a switchover to backup.

Switching Over - The Switching Over state is displayed after the Primary node has failed and the Backup Node is becoming active.

Switched Over - The Switched Over state is displayed after the Primary has failed and the backup has become active. This displays the status of the Backup/Standby after switchover has occurred.

Switching Back - The Switching back state is displayed after a manual 'Switchback to Primary' has been executed.

Backup State:

Below is description of each state the Backup Node can get into.

Standby - Normal state. The backup node is waiting for a failure on the Primary node.

Active - The primary node has failed and the backup node has switched over and is now the backup/active node.

Actively Backing Up:

This field will display the which Primary node is being backed up by the backup/standby node. The status is displayed as an interface which corresponds to the interface on the rear of the Backup/Standby node.

Object Table:

The object Table displays all the Primary/Active nodes that are being backed up in this Redundant Node Cluster. As shown below the table displays the name of the node, its Redundancy state, Connection State, and software version loaded.

Manual Switchover and Switchback

The ClientView GUI allows the operator to execute a manual switchover and a manual switchback.

Switchover: When the Redundant Node Cluster is in its normal state a manual switchover from Primary to Backup can be accomplished. In the object table, select from the list of Primary nodes which node will be switched over. Click on the node to highlight it and then Right Click and select 'Switchover to Backup'. At this point the Primary will reset and a switchover will occur.

Switchback to Primary: The Redundant Node cluster has had one of its nodes switch from Primary/Active to Standby/Active because of a failure to the Primary/Active Node. Once the issue has been fixed a Switchback to Primary/Active needs to occur. To do this hit the "Switchback To Primary" button located in the Redundant Node Cluster GUI. Once this button has been pressed, the Standby/Active node will reset and the Primary will become active again. See below.