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### Before You Begin

Note - See also Which Trays Can I Remove?.

Before attempting these array tray reconfiguration procedures, consider the following:

- The software supports the following array configuration changes:

- Adding expansion units to an existing array 2x2 or 2x4 high-availability (HA) configuration
- Removing expansion units from an existing array 2x4 or 2x6 HA configuration

- Make sure that the master controller unit is identified as Tray 0 before you begin. If the master controller fails over to the alternate master controller unit, the alternate master controller unit assumes the master controller unit status. When this occurs, the master controller unit tray number updates to the tray number of the alternate master controller unit. To change back to the original configuration and tray numbering, you must reset the array controller.
- The Sun StorEdge 6020 and 6120 Arrays System Manual contains more details about expansion units and other array configuration changes. Please read the array configuration chapter in this manual before attempting this procedure. Note that the Sun StorEdge 6300 system does not allow access by telnet. The wizards described in this help perform the underlying commands needed to add or remove expansion units.
- Perform all reconfigurations while the system is offline and prevented from accepting I/O operations from the host system (that is, I/O operations have been quiesced).
- System reconfigurations involve power cycling of storage arrays.
- Evacuate any data stored on the arrays before removing trays. If you are adding trays, you might want to back up your existing data on the arrays.

### Which Trays Can I Remove?

Note - Depending on the current state of the selected array, the Add Expansion or Remove Expansion buttons might be disabled. For example, you cannot remove trays in a 2x2 configuration.

The software supports removing expansion units from an existing array 2x4 or 2x6 HA configuration Always remove expansion units in pairs. An array configuration should always contain two, four, or six expansion units.

See TABLE 2, Removing Trays.

FIGURE 1, FIGURE 2, and FIGURE 3 show the HA configurations and the corresponding tray number.

TABLE 2 Removing Trays
In This Configuration | Remove These Trays
--- | ---
Converting a 2x4 to a 2x2 | Remove Trays 2 and 3. See FIGURE 2.
Converting a 2x6 to a 2x4 | Remove Trays 4 and 5. See FIGURE 3.
Converting a 2x6 to a 2x2 | Remove Trays 2, 3, 4, and 5. See FIGURE 3.

Sun StorEdge Array, 2x2 HA configuration depicting controller unit positions.
FIGURE 1 2x2 HA Configuration and Corresponding Tray Numbers
Sun StorEdge Array, 2x4 HA configuration depicting tray positions for expansion units and controller units.
FIGURE 2 2x4 HA Configuration and Corresponding Tray Numbers
Sun StorEdge Array, 2x6 HA configuration depicting tray positions for expansion units and controller units.
FIGURE 3 2x6 HA Configuration and Corresponding Tray Numbers