IBM System Storage DS5020, Инструкция по установке, использованию и обслуживанию

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The DS5020 supports Fibre Channel (FC), Fiber Channel Solid State Disk (SSD),
Serial Attached SCSI (SAS), and Serial ATA (SATA) E-DDMs intermixed in the
storage subsystem drive chassis. The DS5020 supports up to sixteen 4 Gbps FC, 3
Gbps SATA, or FC-SAS E-DDMs. Even though various type of drives can be
intermixed in a DS5020 configuration, the RAID arrays can be created only using
homogenous type of drives, whether it is FC, SSD, FC-SAS, or SATA. In addition,
only drives of the same drive type as the drives configured in a particular array can
be used as a hot spare for a failed drive in that array. For example, only an SSD
drive can be used as a hot spare in an array that is configured with SSD drives. As
another example, only an FDE capable drive can be used as a hot spare in a
secure FDE array.
Note: The maximum number of SSD disks that can be supported in a DS5020
configuration is 20.
SATA E-DDMs have an ATA translator card that converts the Fibre Channel protocol
interface of the DS5020 drive channel or 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
consist 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 DS5020 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 CRU. If it fails, it must be replaced in
its entirety (E-DDM, ATA translator card/FC-SAS interposer card, bezel, and tray).
The DS5020 drive tray is not interchangeable with the drive tray of other DS4000
storage subsystems such as DS4100 or DS4300 storage subsystems. The DS5020
E-DDM option CRUs are not interchangeable with those of the DS4200 Express
and EXP420. When replacing an E-DDM CRU, be sure to order and install the
correct E-DDM CRU. Using non-supported E-DDM options or FRUs will result in the
E-DDM being locked out by the DS5020 controller firmware and might also damage
the drive connector in the enclosure midplane.
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 an 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 physical location in the storage subsystem.
The DS5020 storage subsystem drive channel operates at a 4 Gbps Fibre Channel
interface speed. Make sure that the DS5020 enclosure speed switch is set correctly
for 4 Gbps Fibre Channel E-DDM CRUs. The DS5020 storage subsystem SATA
E-DDM CRUs have an ATA translator card that converts E-DDM 3 Gbps SATA drive
interface protocol to a 4 Gbps Fibre Channel interface protocol. Operate these
SATA E-DDMs at 4 Gbps Fibre Channel operating speed.
Note: Even though the DS5020 has a 2 or 4 Gbps Fibre Channel Link Rate switch
that can be used to set the drive channel speed at 2 Gbps, the link rate
speed must be set to 4 Gbps. The DS5020 supports only 4 Gbps FC speed
in the drive channel. See “Verifying the link rate setting” on page 140 for
more information.
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IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide