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Measures reported by OVMMgrStorageTest
Besides local storage and NFS storage, Oracle VM also allows administrators to use the following types of SAN storage:
- iSCSI Storage Attached Network
- Fibre Channel Storage Attached Network.
With Internet SCSI, or iSCSI, you can connect storage entities to client machines, making the disks behave as if they are locally attached disks. Fibre channel SAN uses dedicated hardware such as special controllers on the SAN hardware, host bus adapters or HBAs on the client machines, and special fibre channel cables and switches to interconnect the components.
Regardless of the SAN storage used, the space usage on the storage medium has to be observed, so that abnormal usage trends can be captured early, and potential space shortages can be averted. This is possible using the SAN Server Storage test. For each SAN server storage used by the Oracle VM Manager, this test reports the current status of the storage and the space usage on the storage. In the process, offline storage arrays and those that are running out of free space can be accurately isolated.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| Total_capacity |
Indicates the total capacity of this SAN storage. |
GB |
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| Free_space |
Indicates the amount of space in this SAN storage that is still unused. |
GB |
A high value is desired for this measure. A consistent drop in this value is indicative of a steady space erosion, which is a cause for concern. Compare the value of this measure across SAN storage arrays to know which array is running short of free space. |
| Used_space |
Indicates the amount of space used on this SAN storage. |
GB |
A low value is desired for this measure. Compare the value of this measure across arrays to know which arrays has very little free space. |
| Percent_usage |
Indicates the percentage of space in this storage array that is currently in use. |
Percent |
A value close to 100% is indicative of excessive usage of space. This can significantly degrade the performance of the host operating system and VMs using this array. |
| Allocated_space |
Indicates the amount of space that is available for use by the SAN server. |
GB |
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| Status |
Indicates whether/not this SAN storage is online currently. |
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The values that this measure can report and their corresponding numeric values are discussed in the table below:
| Measure Value |
Numeric Value |
| Online |
1 |
| Offline |
0 |
Note:
By default, this measure reports one of the values listed under Measure Values to indicate the current status of a storage array. In the graph of this measure however, the same is represented using the numeric equivalents only. |
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