IBM DS3950, Руководство пользователя и инструкция по установке

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The EXP395 supports up to 16 4 Gbps fibre channel (FC), FC-SAS, or SATA
E-DDMs. The SATA E-DDMs have an ATA translator card that converts the fibre
channel protocol interface of the EXP395 drive channel/loop into the hard drive
SATA protocol interface. It also provides dual paths to the SATA drive for E-DDM
FRU path redundancy. Each SATA hard drive, ATA translator card (also referred to
as a interposer card), and carrier assembly (drive tray) are called SATA E-DDM
FRUs. The fibre channel E-DDMs consisted of the fibre channel and the carrier
assembly (drive tray).
The FC-SAS E-DDMs have a FC-SAS interposer card that translates the SAS drive
interface to a 4 Gbps FC protocol interface of the DS3950 drive channel. Each SAS
drive, FC-SAS interposer card (with a 2.5" to 3.5" form factor conversion), and
carrier assembly are called FC-SAS E-DDM CRUs. There are no serviceable parts in
an E-DDM FRU. If it fails, it must be replaced in its entirety. When replacing an
E-DDM FRU, be sure to order and install the correct E-DDM FRU.
Install E-DDM FRUs in the 16 drive bays on the front of the storage expansion
enclosure from the leftmost (slot 1) to rightmost (slot 16).
The EXP395 storage expansion enclosure drive channel operates at 4 Gbps fibre
channel interface speed. Ensure that the EXP395 enclosure speed switch is set
correctly for the 4 Gbps fibre channel E-DDM FRUs. The EXP395 SATA E-DDM
FRUs have an ATA translator card that converts E-DDM 3 Gbps SATA drive
interface protocol to 4 Gbps fibre channel interface protocol. Similarly, the FC-SAS
E-DDM FRUs have a FC-SAS interposer card that convert the 6 Gbps the SAS
protocol to a 4 Gbps FC interface protocol.
Important: Do not change the speed of a drive loop while the storage subsystem is
powered on. Such a speed change will cause unpredictable results.
Also, the drive expansion enclosures must be power cycled for the new
speed setting to be correctly recognized.
If you need to change the speed of a drive loop, complete the following steps:
1. Prepare applications for storage system shutdown.
2. Shut down the storage system.
3. Shut down the storage expansion enclosures.
4. Change the storage expansion enclosure speed settings.
5.
Power on the storage expansion enclosures.
6. Power on the storage subsystem.
7.
Restore storage subsystem host application operations.
The EXP395 4 Gbps FC E-DDM option/FRU and 3 Gbps SATA E-DDM
option/FRU are interchangeable with the drive tray of the DS4000 EXP810 storage
expansion enclosure. However, they are not compatible with any other DS4000
Figure 1. EXP395 hot-swap drive bays
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IBM System Storage DS3950 EXP395 Storage Expansion Enclosure: Installation, User’s, and Maintenance Guide