## About Identifiers for Cabinets

Each system consists of a base cabinet and, optionally, up to two expansion cabinets. The cabinet numbers are used in the names and IP addresses of the arrays and of other hardware in the cabinet.

The cabinets are numbered from 0 through 2:

- Base cabinet: 0
- Expansion cabinet: 1
- Expansion cabinet: 2

The maximum number of trays in the base cabinet is 8. The maximum number of trays in an expansion cabinet is 12. The following figure shows the maximum number of trays and how the trays are numbered. (Each tray is shown as a controller tray.)

### Related Topics

- About Storage Trays
- About Arrays and Trays
- About Tray Numbering Conventions