Volumes in the storage array

Volumes are data containers that manage and organize the storage space on your storage array. Volumes are created from the storage capacity available on your storage array and make it easy to organize and use your system’s resources. This concept is similar to using folders/directories on a computer to organize files for easy and quick access.

Volumes are the only data layer visible to hosts. In a SAN environment, volumes are mapped to logical unit numbers (LUNs), which are visible to hosts. LUNs hold the user data that is accessible using one or more of the host access protocols supported by the storage array, including FC, iSCSI, and SAS.

Volume types you can create from pools and volume groups

Volumes draw their capacity from pools or volume groups. You can create the following types of volumes from the pools or volume groups that exist on your storage array.

Thick volumes and thin volumes draw capacity from the storage array in different ways:

Thin provisioning helps to avoid wasted allocated capacity and can save businesses on up-front storage costs. However, full provisioning has the benefit of less latency because all storage is allocated at once when thick volumes are created.

Characteristics of volumes

Each volume in a pool or volume group can have its own individual characteristics based on what type of data will be stored in it. Some of these characteristics include:

During volume creation, each volume is allocated capacity and is assigned a name, segment size (volume groups only), controller ownership, and volume-to-host assignment. Volume data is automatically load balanced across controllers, as needed.