IBM Marine Radio DS4700 User Manual
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Filter and filter retainer
The hot-swap features enable you to remove and replace 2 or 4 Gbps fibre channel
or SATA hard E-DDMs, power supply and fan units, and controllers without turning
off the storage subsystem. You can maintain the availability of your system while a
hot-swap device is removed, installed, or replaced.
or SATA hard E-DDMs, power supply and fan units, and controllers without turning
off the storage subsystem. You can maintain the availability of your system while a
hot-swap device is removed, installed, or replaced.
Enhanced Disk Drive Modules (E-DDMs)
The hot-swap drive bays that are accessible from the front of your storage
subsystem are shown in Figure 1.
subsystem are shown in Figure 1.
The DS4700 Express supports both fibre channel (FC) and SATA E-DDMs
intermixed in the storage subsystem drive chassis. The DS4700 Express supports
up to sixteen 2 or 4 Gbps fibre channel (FC) or SATA E-DDMs.
intermixed in the storage subsystem drive chassis. The DS4700 Express supports
up to sixteen 2 or 4 Gbps fibre channel (FC) or SATA E-DDMs.
SATA E-DDMs have an ATA translator card that converts the fibre channel protocol
interface of the DS4700 Express drive channel/loop into the hard drive SATA
protocol interface. It also provides dual paths to the SATA drive for drive CRU path
redundancy. Each drive, ATA translator card (also referred to as interposer card),
and carrier assembly are called SATA E-DDM CRUs. The fibre channel E-DDMs
consisted of the fibre channel and the carrier assembly (drive tray).
interface of the DS4700 Express drive channel/loop into the hard drive SATA
protocol interface. It also provides dual paths to the SATA drive for drive CRU path
redundancy. Each drive, ATA translator card (also referred to as interposer card),
and carrier assembly are called SATA E-DDM CRUs. The fibre channel E-DDMs
consisted of the fibre channel and the carrier assembly (drive tray).
Install E-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 a E-DDM is
installed, the drive and tray slot designation is set automatically. The hardware
addresses are based on the enclosure ID, which is set by the controller software,
and on the E-DDM's physical location in the storage subsystem.
from the leftmost slot (slot 1) to the rightmost slot (slot 16). When a E-DDM is
installed, the drive and tray slot designation is set automatically. The hardware
addresses are based on the enclosure ID, which is set by the controller software,
and on the E-DDM's physical location in the storage subsystem.
The DS4700 Express Storage Subsystem drive channel operates at either 2 or 4
Gbps fibre channel interface speed. Ensure that the DS4700 Express enclosure
speed switch is set correctly for the 2 Gbps or 4 Gbps fibre channel E-DDM CRUs.
The DS4700 Express Storage Subsystem SATA E-DDM CRUs have an ATA
translator card that converts E-DDM 3 Gbps SATA drive interface protocol to either
2 Gbps or 4 Gbps fibre channel interface protocol. It is recommended to operate
these SATA E-DDMs at 4 Gbps fibre channel operating speed whenever the
configuration allows, for example, when no 2 Gbps fibre channel devices are in the
configuration. The Link Rate setting speed must be set accordingly. See “Verifying
the Link Rate setting ” on page 161 for more information. The enclosure speed of
the DS4000 Storage Subsystem must be the same as that of the storage expansion
enclosures connected to it.
Gbps fibre channel interface speed. Ensure that the DS4700 Express enclosure
speed switch is set correctly for the 2 Gbps or 4 Gbps fibre channel E-DDM CRUs.
The DS4700 Express Storage Subsystem SATA E-DDM CRUs have an ATA
translator card that converts E-DDM 3 Gbps SATA drive interface protocol to either
2 Gbps or 4 Gbps fibre channel interface protocol. It is recommended to operate
these SATA E-DDMs at 4 Gbps fibre channel operating speed whenever the
configuration allows, for example, when no 2 Gbps fibre channel devices are in the
configuration. The Link Rate setting speed must be set accordingly. See “Verifying
the Link Rate setting ” on page 161 for more information. The enclosure speed of
the DS4000 Storage Subsystem must be the same as that of the storage expansion
enclosures connected to it.
There are no serviceable parts in an E-DDM CRU. If it fails, it must be replaced in
its entirety (E-DDM, ATA translator card, bezel, and tray). The DS4700 Express
drive tray is not interchangeable with the drive tray of other DS4000 storage
its entirety (E-DDM, ATA translator card, bezel, and tray). The DS4700 Express
drive tray is not interchangeable with the drive tray of other DS4000 storage
Figure 1. DS4700 Express hot-swap drive bays
Chapter 1. Introduction
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