14 Sun StorageTek 2500 Series Array Hardware Installation Guide • September 2009
Controller Tray and Drive Expansion Tray Power-
Fan Assembly
The power-fan assembly for the Sun StorageTek 2540 Array, the Sun StorageTek 2530
Array, and the Sun StorageTek 2510 Array is identical and interchangeable.
Note – A minimum of two disk drives must be operating in a controller tray or in a
drive expansion tray to avoid generating a power-fan assembly error.
The power-fan assembly contains an integrated cooling fan. The power supply
provides power to the internal components by converting incoming AC voltage to
DC voltage. The fan circulates air inside of the tray by pulling air in through the
vents on the front of the assembly and pushing the air out of the vents on the back
of each fan.
Each tray contains two power-fan assemblies. If one power supply is turned off or
malfunctions, the other power supply maintains electrical power to the tray.
Likewise, the fans provide redundant cooling. If one of the fans in either fan housing
fails, the remaining fan continues to provide sufficient cooling to operate the tray.
The remaining fan runs at a higher speed until the failed fan is replaced. Replace the
failed fan as soon as possible.
Sun StorageTek 2501 Expansion Tray
The drive expansion tray expands the storage capacity of a storage array. The
controllers in the controller tray can connect to the drive expansion tray and access
the disk drives in the drive expansion tray for additional storage. A drive expansion
tray contains both physical components (disk drives, Input/Output Modules
(IOMs), and power-fan assemblies) and logical components (virtual disks and
volumes).
Expansion Tray IOM
The expansion tray contains two IOMs that provide the interface between the disk
drives in the expansion tray and the controllers in the controller tray. Each controller
in the controller tray connects to an IOM.
If one IOM fails, the other IOM provides a redundant data path to the disk drives.
You can replace a failed IOM while the power to the storage array is turned on and
the storage array is processing data (a hot swap).
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