| When running or testing an NCS cluster, you can view valuable information about the current state of your cluster, and its various resources, from the Cluster Management view in iManager (see Figure 9.5). Figure 9.5. View of cluster status in iManager. 
In order for the Cluster Manager to report your cluster configuration, you must locate and select your cluster object from eDirectory using the Cluster link. After you select the object, the Custer Manager page will refresh and display information on the current cluster. Some of the specific cluster information you can gather from the Cluster Manager view includes the following: An icon represents each node in your cluster. The yellow disk indicates the node that is functioning as the master server in the cluster. The master server can change over time due to failover or migration events that take place. Epoch indicates the number of times the cluster state has changed. The epoch number will increment each time a node joins or leaves the cluster. The Run Report link provides a detailed report of your cluster. This report includes the cluster settings, quorum member information, and load and unload scripts. In the Cluster State View window, each node of the cluster is listed along with its node type and associated resource state.
Table 9.1 describes different resource states you might see in the Cluster State View window of the Cluster Manager page in iManager and provides some possible actions for each state. Table 9.1. Cluster Resource StatesRESOURCE STATE | DESCRIPTION | ACTION |
|---|
Alert | One of the resource policies has been set to Manual. The resource is waiting for admin instructions. | Click the Alert Status indicator and you will be prompted to start, fail over, or fail back the resource. | Comatose | The resource is not running and requires administrator intervention. | Select the Comatose Status indicator and take the resource offline. After resource problems are resolved, the resource can be put back online. | Unloading | The resource is unloading from the server on which it was running. | None. | Running | The resource is in a normal running state. | Select the Running Status indicator, and you can choose to migrate the resource to a different node or take the resource offline. | Loading | The resource is loading on a server. | None. | Unassigned | None of the nodes in the Assigned Node list are currently online. | Select the Unassigned Status indicator and you can take the resource offline. This will prevent the resource from running on any of its preferred nodes should one or more of them rejoin the cluster. | NDS_Sync | The properties of the resource have changed and the changes are still being synchronized in eDirectory. | None. | Offline | The resource is shut down or is in a dormant or inactive state. | Select the Offline Status indicator and, if desired, click the Online button to load the resource. NCS will choose the best node possible, given the current state of the cluster the resource's Assigned Nodes list. | Quorum wait | The resource is waiting for a quorum to be established so that it can begin loading. | None. |
For more information on NCS, refer to the online OES Linux documentation. |
