Measures reported by PureVolCapTest
A volume or logical drive is a single accessible storage area with a single file system, typically (though not necessarily) resident on a single partition of a hard disk. If a volume is over-utilized or is unable to process I/O requests quickly, it can damage the user experience with the entire FlashArray. It is hence the responsibility of the storage administrator to keep an eye out for space contentions and processing bottlenecks with each of the volumes in FlashArray, detect such anomalies even before they occur, and resolve them before users complain. The PureVolCapTest test helps the storage administrator discharge his duties efficiently.
This test auto-discovers the volumes on the target FlashArray, and for each volume, this test reports the total capacity, the space availability, the size and the amount of space occupied. This enables administrators to proactively detect a potential slowdown in processing or a probable contention in the volume, identify which volume is contributing to these abnormal phenomena, and intervene to ensure that the problem is resolved before it spirals out of control.
Outputs of the test : One set of results for each volume on the target FlashArray.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| totalCapacity |
Indicates the total capacity of this volume. |
TB |
The detailed diagnosis of this measure reveals the details on data reductions performed on each volume. |
| allUsedCapacity |
Indicates the amount of space utilized in this volume. |
TB |
If the value of this measure is close to the totalCapacity measure, then, it indicates that the volume is running out of space. |
| freeCapacity |
Indicates amount of space that is available for use on this volume. |
TB |
A low value is desired for this measure. |
| usedCapacityPCT |
Indicates the percentage of space utilized on this volume. |
Percent |
Ideally, the value of this measure should be low. |
| freeCapacityPCT |
Indicates the percentage of space that is available for use on this volume. |
Percent |
A high value is desired for this measure. |
| volumeCapacity |
Indicates the amount of space allocated for this volume. |
TB |
The FlashArray presents disk-like volumes to connected hosts in the host group and maintains immutable snapshots of volume contents. Ideally, a low value is desired for these measures. |
| snapShotCapacity |
Indicates the amount of space allocated for storing the snapshots on this volume. |
TB |
|
| sharedCapacity |
Indicates the amount of space allocated for the shared connections on this volume. |
TB |
|
| systemCapacity |
Indicates the amount of storage space allocated for RAID-3D parity and other metadata on this volume. |
TB |
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