eG Monitoring
 

Measures reported by OraExaGrdDisTest

A cell disk created on the target Oracle Exadata Storage Server can be further sub divided into grid disks which can be further exposed to Oracle ASM as disks. Grid disks are the logical storage entities on the storage cell upon which ASM disks can be discovered and ASM disk groups can be built. An Oracle Automatic Storage Management (Oracle ASM) disk group is the primary storage abstraction within Oracle ASM, and is composed of one or more grid disks. Exadata administrators are encouraged to strive for equally sized, well-balanced grid disk configurations. Doing so enables Exadata to maximize disk I/O bandwidth, I/Os per second, and ultimately ensure a well-balanced, high-performing storage platform on Exadata. If a grid disk is inactive or not available, then, users may be deprived access to the data available on that grid disk. This will also lead to an imbalance in the disk I/O bandwidth and eventually affect the performance of the storage server. To avoid such adversities and to ensure that the storage server is always at its peak performance, it is essential to monitor the status of the grid disks periodically. The OraExaGrdDisTest test helps administrators in this regard!.

This test auto-discovers the grid disks created on each ASM disk group and reports the status of each grid disk. Using this test, administrators can identify inactive disks and analyze the reason behind the grid disks being inactive. This test also reports the count of errors encountered by each grid disk. Administrators can figure out the grid disk that is most frequently prone to errors and can initiate remedial measures to avert such errors.

Outputs of the test: One set of results for each ASM disk group:grid disk combination of the target Oracle Exadata Storage Server that is being monitored

Descriptor: Grid disk

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
gridDiskStatus Indicates the current status of this grid disk.  

The table below indicates the values that this measure can report and their corresponding numeric equivalents:

Measure value Numeric Value
Active 100
Import required 90
Inactive 50
Not present 0

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the current status of the grid disk. However, in the graph of this measure, the status of the grid disk will be represented using the corresponding numeric equivalents only.
errorCount Indicates the number of errors encountered by this grid disk. Number

Ideally, the value of this measure should be zero.

Compare the value of this measure across grid disks to identify the grid disk that is most frequently prone to errors.