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6 Sun StorageTek 2500 Series Array Hardware Installation Guide • March 2007
FIGURE 1-5 Drive Expansion Tray Rear-Access Components
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:
1. IOM Modules
2. Power-Fan
Assembly Modules
1
2