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Dell Unity™ Family Unisphere® Command Line Interface User Guide

Manage storage system capacity settings

The following table lists the general storage system capacity attributes:

Table 1. General storage system capacity attributes
Attributes Description
Free space Specifies the amount of space that is free (available to be used) in all storage pools on the storage system.
Used space Specifies the amount of space that is used in all storage pools on the storage system.
Preallocated space Space reserved across all of the pools on the storage system. This space is reserved for future needs of storage resources, which can make writes more efficient. Each pool may be able to reclaim preallocated space from storage resources if the storage resources are not using the space, and the pool space is running low.
Total space Specifies the total amount of space, both free and used, in all storage pools on the storage system.
Data Reduction space saved Specifies the storage size saved on the entire system when using data reduction.
NOTE:Data reduction is available for thin LUNs and thin file systems. The thin file systems must be created on Unity systems running version 4.2.x or later.
Data Reduction percent Specifies the storage percentage saved on the entire system when using data reduction.
NOTE:Data reduction is available for thin LUNs and thin file systems. The thin file systems must be created on Unity systems running version 4.2.x or later.
Data Reduction ratio Specifies the ratio between data without data reduction and data after data reduction savings.
NOTE:Data reduction is available for thin LUNs and thin file systems. The thin file systems must be created on Unity systems running version 4.2.x or later.

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