eG Monitoring
 

Measures reported by OraExaPhyDisTest

Each Exadata storage cell node contains 12 physical disks. A physical disk is an actual device in storage cell that constitutes a single disk drive spindle. These physical disks are connected to the RAID controller. Multiple LUNs can be provisioned from a physical disk. When a physical disk fails all of a sudden, users may be deprived access to the data available in the physical disk. To avoid such inconvenience to the users and to ensure that the data is available to the users round the clock, it is essential to monitor the status of the physical disks periodically. The OraExaPhyDisTest helps administrators in this regard!

This test auto-discovers the physical disks on the target Oracle Exadata Storage Server and reports the status of each physical disk. Using this test, administrators can not only identify failed disks, but can also predict potential failure of a disk, so that efforts can be undertaken to avert the same. This test also reports the count of LUNs provisioned using each physical disk.

Outputs of the test: One set of results for each physical disk on the target Oracle Exadata Storage Server that is being monitored

Descriptor: Physical Disk

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
diskStatus Indicates the current status of this physical disk.  

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

Measure value Numeric Value
Normal 100
Poor performance 90
Write-through caching 80
Predective failure 70
Peer failure 60
Failed 50
Not present 0

Note:

By default, this measure reports the above-mentioned Measure Values while indicating the current status of the physical disk. However, in the graph of this measure, the status of the physical disk will be represented using the corresponding numeric equivalents only.
noOfLUNs Indicates the number of LUNs provisioned using this physical disk. Number