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The EqualLogic iSCSI SAN's unique peer storage architecture consolidates all storage resources into an easy-to-manage tiered storage pool, securely accessed by servers across a standard Ethernet network.

A PS Series group is comprised of a single PS Series array or multiple arrays working together. The group is seen as a single, shared storage service by application servers and administrators. When an array is configured as a group member, its RAID-protected disk space is added to the group’s storage pool.

Sufficient storage resources should always be available in the pool so that, applications depending upon the pool can function without a glitch. A sudden or consistent erosion of disk space in the pool can have disastrous effects on application performance.

This test enables you to keep track of the space usage on the group's storage pool so that, you can detect and fix a space drain before it is too late.

Measurement	Description	Measurement Unit	Interpretation
Total_space	Indicates the total amount of space in the group storage pool currently.	GB
Used_space	Indicates the total space in the group storage pool that is currently in use.	GB
Reserved_space	Indicates the total space in the group storage pool that is currently reserved for snapshot data.	GB
Free_space	Indicates the current unused space in the pool.	GB
Free_percentage	Indicates the percentage of space in the pool that is currently unused.	Percent	Ideally, the value of this measure should be high. A very low percentage of free space is indicative of excessive space utilization in the storage pool. If the space in the pool is not increased, then applications using the pool will experience slowdowns.