EMC Centera Nodes Test

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 the Node test.

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.

Target of the test : An EMC Centera storage system.

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each node in the target system

Configurable parameters for the test

Parameter	Description
Test period	How often should the test be executed.
Host	The host for which the test is to be configured.
Port	The port number at which the specified host listens. By default, this is NULL.
User and Password	In order to monitor an EMC Centera Storage, the eG agent has to be configured with the credentials of a read only user. Specify the login credentials of such a user in the User and Password text boxes.
Confirm Password	Confirm the password by retyping it here.
CerteraViewer JAR Path	Path of CenteraViewer on agent host. CenteraViewer is installed along with CenteraCLI. By default the installation path is C:\Program Files\EMC\Centera\2_4\SystemOperator\lib\CenteraViewer.jar
Timeout Seconds	Specify the time duration (in seconds) beyond which this test should time out in the TIMEOUT text box. The default is 120 seconds.

Measurements made by the test

Measurement	Description	Measurement Unit	Interpretation
Status	Indicates if the node is online or offline.		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.
Total Capacity	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.
Free Capacity	Indicates the free storage capacity available on the node.	TB
Faulted Capacity	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.
Total Object count	Total number of object addresses available.	Number
Is Error	Indicates if there has been any error or exception occurred during storage operations.		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.