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Measures reported by EMCCtraNodeTest
Nodes are the fundamental building blocks of an EMC Centera cluster that is built on a highly redundant architecture. As a rack - mountable appliance, each node includes processing power, storage disk capacity, network controllers etc. Each node in a distributed cluster has compute as well as storage or capacity capabilities. If any of the nodes is running out of storage space, the node will not be able to service the user requests received, resulting in poor performance of the node. This in turn will degrade overall performance of the target storage system. To avoid this, performance of each node should be tracked continuously. To achieve this, administrators can use theEMCCtraNodeTest.
For each node, this test reports the status of the node, space available and space used. By closely monitoring the performance of each node, administrators may be alerted to investigate the reasons for the space crunch, and resolve the issue before the overall performance of the storage system gets affected.
Outputs of the test : One set of results for each node in the target system.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| status |
Indicates if the node is online or offline. |
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The health status of 0 indicates the node is offline. Usually this means either the node has failed or has been taken offline by user. In case the node is failed, you may want to start the recovery process.
The values that this measure can report and their corresponding numeric values are tabulated below:
| Measure Value |
Numeric Value |
| Off |
0 |
| On |
100 |
Note:
By default, this measure reports the above-mentioned Measure Values while indicating the status. However, in the graph of this measure, the same will be represented using the corresponding numeric equivalents only. |
| totalCapacity |
Indicates the total storage capacity available on the node. |
TB |
If the free capacity is only a small fraction of total capacity the storage system may not be able to serve the clients for long. |
| freeCapacity |
Indicates the free storage capacity available on the node. |
TB |
If the free capacity is only a small fraction of total capacity the storage system may not be able to serve the clients for long. |
| faultedCapacity |
Indicates the storage capacity which is faulted and is not available. |
TB |
Faulted capacity is something which cannot be used for some reason. You have to fix the fault to use available capacity. |
| totalObjectCount |
Total number of object addresses available. |
Number |
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| isError |
Indicates if there has been any error or exception occurred during storage operations. |
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The value of 0 indicates no error while 100 indicates error.
The values that this measure can report and their corresponding numeric values are tabulated below:
| Measure Value |
Numeric Value |
| No |
0 |
| Yes |
100 |
Note:
By default, this measure reports the above-mentioned Measure Values while indicating the status. However, in the graph of this measure, the same will be represented using the corresponding numeric equivalents only. |
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