9.4 Monitoring Cluster and Resource States
The page in iManager gives you important information about the status of servers and resources in your cluster.
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In iManager, select > .
View the overall status of the each of the clusters in your list.
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In your personalized My Clusters list, select the name of the cluster you want to manage.
If the cluster does not appear in your list, add the cluster to your list as described in Section 8.2, Setting Up a Personalized List of Clusters to Manage.
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View the status of the cluster nodes and resources.
If scrolling is needed to view the complete list, you can use the option to set a longer refresh rate for the page in order to allow enough time to view the status for all items.
- Master Server
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The master server in the cluster is identified by a yellow diamond in the middle of the server icon (
). The master server is initially the first server in the cluster, but another server can become the master if the first server fails. - Operating State
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An icon next to the cluster resource or cluster indicates its operating state. Table 9-1 describes each operating state and icon. When a resource is state is blank or has no colored icon, it is unassigned, offline, changing state, or in the process of loading or unloading.
Table 9-1 Operating States for a Cluster and Its Resources
State
Icon
Description
Normal
A green ball indicates that the node is running, or the resource is online.
Stopped
A red ball with a horizontal white line indicates that the node or resource is stopped and waiting for administrator intervention.
Offline
A white ball with a horizontal red line indicates that the node or resource is offline.
Critical
A white ball with a red X indicates that the node has failed, the resource is comatose, or a resource in a My Resources list cannot be not found (renamed or deleted).
Warning
A white ball with a yellow diamond indicates that an alert condition has occurred, and the resource needs administrator attention.
Unknown
A yellow ball with a question mark indicates that the state of the node or resource cannot be determined. Either the server is not currently a member of the cluster or its state is unknown.
- Epoch
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The Epoch number indicates the number of times the cluster state has changed. The cluster state changes every time a server joins or leaves the cluster.
- Cluster Resource States
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Table 9-2 identifies the different resource states and gives descriptions and possible actions for each state.
Table 9-2 Cluster Resource States
Resource State
Description
Possible Actions
Alert
Alert types are:
- Failback Alert
- Failover Alert
- Start Alert
Alerts can result if the Start mode, Failover mode, or Failback mode for the resource has been set to Manual. The resource is waiting for the administrator to intervene to start, fail over, or fail back the resource on the specified server.
On the Cluster Manager page in iManager, select the check box next to the resource, click the option, then resolve the alert. Depending on the resource state, you are prompted to start, fail over, or fail back the resource. See Section 9.5, Responding to a Start, Failover, or Failback Alert.
After you clear the , you can take the resource offline, then bring the resource online.
Comatose
The resource is not running properly and requires administrator intervention.
Click the status indicator and take the resource offline. After resource problems have been resolved, you can bring the resource online (return it to the running state).
A comatose resource cannot be taken directly to an online state.
Loading
The resource is in the process of loading on a server.
None.
NDS_Sync
The properties of the resource have changed and the changes are still being synchronized in eDirectory.
None.
Offline
Offline status indicates the resource is shut down or is in a dormant or inactive state.
If desired, you can click the status indicator and click the button to load the resource on the best node possible, given the current state of the cluster and the resource's preferred nodes list.
Quorum Wait
The resource is waiting for the quorum to be established so it can begin loading.
None.
Running
The resource is in a normal running state.
You can click the status indicator and choose to either migrate the resource to a different server in your cluster or unload (bring offline) the resource.
Unassigned
There is not an assigned node available that the resource can be loaded on.
If desired, you can click the status indicator and offline the resource. Offlining the resource prevents it from running on any of its preferred nodes if any of them join the cluster.
Unloading
The resource is in the process of unloading from the server it was running on.
None.