## About Storage Trays

Storage trays contains physical disks. Each tray has a minimum of 7 and a maximum of 14 disks. The trays are identified by whether they contain a RAID controller:

- A controller tray is a storage tray with hardware RAID management built into the controller.
- An expansion tray is a storage tray with disks only and no controller. This type of tray is managed by a controller tray.

The following figure shows the symbols for a controller tray and an expansion tray.

The following table shows how the trays are arranged in the supported array configurations.

Array Configuration | Number of Controller Trays | Number of Expansion Trays
--- | --- | ---
2x2 | 2 | 0
2x4 | 2 | 2
2x6 | 2 | 4

The following figure shows how the trays can be configured.

To see the current storage trays, go to the Storage Tray Summary page, as described in Displaying Storage Tray Information.

To see the current storage arrays, go to the Storage Array Summary page, as described in Displaying Array Information.

### Related Topics

- About Tray Numbering Conventions
- About Identifiers for Cabinets
- Displaying Storage Tray Information
- About Arrays and Trays
- About Conventions for Array Names and IP Addresses