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Figure 1. DS4200 Express hot-swap drive bays
The DS4200 Express supports up to 16 SATA EV-DDMs, which come preinstalled in
drive trays. Each drive, ATA translator card (also referred to as interposer card), and
carrier assembly are called EV-DDM CRUs. The ATA translator card converts the
fibre channel protocol interface of the DS4200 Express drive channel/loop into the
SATA protocol interface. It also provides dual paths to the SATA drive for drive CRU
path redundancy.
Install EV-DDM CRUs in the 16 drive bays on the front of the storage subsystem
from the leftmost slot (slot 1) to the rightmost slot (slot 16). When an EV-DDM is
installed, the EV-DDM and tray slot designation is set automatically. The hardware
addresses are based on the enclosure ID switch setting on the controller and on the
EV-DDM's physical location in the storage subsystem.
The DS4200 Express Storage Subsystem drive channel operates at either 2 or 4
Gbps fibre channel interface speed. The DS4200 Express Storage Subsystem
SATA EV-DDM CRUs have an ATA translator card that converts EV-DDM 3 Gbps
SATA drive interface protocol to either 2 Gbps or 4 Gbps fibre channel interface
protocol. It is recommended that the DS4200 Express enclosure speed is set at 4
Gbps when these SATA EV-DDM CRUs are installed and connected to storage
expansion enclosures running at 4 Gbps speed. The Link Rate setting speed must
be set accordingly. See "Verifying the Link Rate setting " on page 120 for more
information.
There are no serviceable parts in a EV-DDM CRU. If it fails, it must be replaced in
its entirety (EV-DDM, interposer card, bezel, and tray). The DS4200 Express drive
tray is not interchangeable with the drive tray of other DS4000 storage subsystems
such as DS4100 or DS4300 storage subsystems. The DS4200 Express drive option
CRUs are not interchangeable with those of the DS4800, DS4700, and EXP810.
When replacing an EV-DDM CRU, be sure to order and install the correct EV-DDM
CRU. Using non-supported EV-DDM options or FRUs will result in the EV-DDM
being locked out by the DS4200 Express controller firmware and might also
damage the drive connector in the enclosure midplane.
Note: To determine whether you have installed a correct EV-DDM CRU, check its
Product ID. In this release, the EV-DDM's Product ID should be
ST350064INS 42D0392 39M0181 IBMV. See "Finding controller, storage
expansion enclosure, and drive information" on page 86 for details on how to
locate an EV-DDM's Product ID.
7
Chapter 1. Introduction
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