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Adequate space should be available in the storage arrays to ensure uninterrupted functioning of the mission-critical applications that are using the storage services provided by the storage arrays. If a storage array is about to run out of space, then, administrators should be intimated of the space crunch well in advance so that, storage space in the storage array can be enhanced before service levels start taking a turn for the worse!

This test periodically checks the space usage in each storage array on the target storage system and proactively alerts administrators to potential storage space contentions so that, amends are made before application performance deteriorates.

Outputs of the test: One set of results for the storage array on the storage system being monitored.

Measurement	Description	Measurement Unit	Interpretation
Total_capacity	Indicates the total storage space available in the storage array.	TB
allocatedCapacity	Indicates the amount of storage space that is allocated to from the storage array.	TB	If the value of this measure grows closer to the value of the Total capacity measure, then administrators may want to consider adding more storage to the storage array, or freeing space in the storage array by deleting unnecessary data.
allocatedPercentage	Indicates the percentage of storage space that is allocated to from the storage array.	Percent
freeCapacity	Indicates the amount of storage space that is available for use on the storage array	TB	A high value is desired for this measure. A very low value for this measure indicates a shortage of storage space on the storage array.