What is an Extent and what information can I view using the Extent tab on DSN-3200?

An extent (also known as a “physical extent”) is a contiguous set of logical blocks (LBs) on a drive. A volume typically consists of extents from several drives.

When a volume is selected in the Main Display, you can use the Extents tab to view information about the extents on the selected volume. Initially, the Extents tab shows basic extent information. This provides drive links that, when clicked, display the selected drive in the Extents tab of the Physical Storage View.