## About Conventions for Array Names and IP Addresses

The host names and IP addresses for arrays are based on the arrays' positions in the cabinet:

- Each array has a static, preconfigured IP address. The array in the lowest position in a base cabinet has the IP address 192.168.0.40.
- Each array has a host name formed by the following syntax:

"array" + cabinet# + position #

where:

- cabinet# is 0 for the base cabinet, 1 for the first expansion cabinet, 2 for the second expansion cabinet, and so on.
- position # is 0 through 3 for positions in the base cabinet and 0 through 5 for positions in an expansion cabinet, 0 being the lowest position.

The array in the lowest position in the base cabinet has the host name `array00`, indicating that it is the array on the bottom of cabinet 0. The lowest array in the first expansion cabinet is array10, and the lowest array in the second expansion cabinet is array20.

Within each array, the bottom controller tray is the master and the top controller tray is the alternate master. For example, the controller tray in tray1 is the master, and the controller tray in tray2 is the alternate master. If the master controller tray fails, the alternate master controller tray uses the array's IP address.

### Related Topics

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