Sun Microsystems 2500 manual Controllers, Sun StorageTek 2540 Array

FIGURE 1-5Drive Expansion Tray Rear-Access Components

1

	1.	IOM Modules
2	2.	Power-Fan

Assembly Modules

Controllers

The Sun StorageTek 2540 Array and the Sun StorageTek 2530 Array have two controllers. The controllers manage the input/output (I/O) between the volumes and the data host. The controllers have an Ethernet connection to the management host for out-of-band management and contain a battery that provides backup power to the 1 GB DIMM cache memory for up to three days in the event of a power loss.

Because each controller tray contains two controllers, the data path through one controller can fail and the other controller provides a redundant data path to all of the disk drives. If a controller fails, you can replace the failed controller while the power is applied and the storage array is processing data (a hot swap). The system automatically updates the firmware for the new controller so that it matches the configuration database.

Each controller has a media access control (MAC) address that identifies it on the network. The MAC address for a controller is on a label on the controller. The MAC address label is attached to the controller in two places: at the top of the tray and at the rear of the tray.

The tray ID numbers are set by the trays themselves on first power on. However, you can change the setting through the Common Array Manager software. The tray ID numbers on both of the controllers in one controller tray are identical under optimal operating conditions.

Sun StorageTek 2540 Array

This Fibre Channel (FC) controller tray provides the following capabilities:

6 Sun StorageTek 2500 Series Array Hardware Installation Guide • March 2007