eG Monitoring
 

Measures reported by HpP2kCtrlrStsTest

The storage controller is essentially a server that's responsible for performing a wide range of functions for the storage system. Each controller has an I/O path to communicate to the storage network or the directly-attached servers, an I/O path that communicates to the attached storage devices or shelves of devices, and a processor that handles the movement of data as well as other data-related functions, such as RAID and volume management. In the modern data center, the performance of the storage system can be directly impacted (and in many cases determined) by the overall health of the storage controller. In single-controller configurations, if the storage controller crashes, then the storage system as a whole will become inaccessible to users. This is why, it is good practice to go for dual-controller configurations. A dual-controller configuration improves application availability because in the unlikely event of a controller failure, the affected controller fails over to the surviving controller with little interruption to the flow of data. However, since fail over occurs automatically upon the failure of a controller, administrators may not even know why the primary controller failed or whether the secondary has taken over or not! This is when the HpP2kCtrlrStsTest test comes in handy!

This test not only monitors the status of each controller in the HP P2000 storage system, but also promptly reports controller failures and the reason for the failure. In the process, the test also indicates whether the primary controller has failed over to the secondary or not.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
status Indicates the current operational status of this controller.   The values that this measure can report and their corresponding numeric values are tabulated below:

Measure Value Numeric Value
Down 0
Unknown 1
Operational 2
Not installed 3

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the operational status of this controller. However, the graph of this measure will be represented using the corresponding numeric equivalents of the Measure Values as mentioned in the table above.
failedOver Indicates whether this controller has failed over to the partner controller i.e., the secondary controller (in a redundant setup).   The values that this measure can report and their corresponding numeric values are tabulated below:

Measure Value Numeric Value
Yes 0
No 1

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the failed over status of this controller. However, the graph of this measure will be represented using the corresponding numeric equivalents of the Measure Values as mentioned in the table above.

The detailed diagnosis capability of this measure if enabled, lists the time, the name of the controller and the reason for the fail over of the controller.
health Indicates the overall health of this controller.   The values that this measure can report and their corresponding numeric values are tabulated below:

Measure Value Numeric Value
Fault 0
OK 1
Unknown 2

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the overall health of this controller. However, the graph of this measure will be represented using the corresponding numeric equivalents of the States as mentioned in the table above.

The detailed diagnosis capability of this measure if enabled, lists the time, the name of the controller and the reason for the overall health of the controller.