Types Of Interface Ports; Host Ports - IBM TotalStorage DS4300 Installation, User's, And Maintenance Manual

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Types of interface ports

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First, insert the SFP into the port, and then insert a fiber-optic cable into the SFP.
The other end of the fiber-optic cable connects to an external device. Note that
SFPs are laser products.
Statement 3
CAUTION:
When laser products (such as CD-ROMs, DVD drives, fiber optic devices, or
transmitters) are installed, note the following:
v Do not remove the covers. Removing the covers of the laser product could result in
exposure to hazardous laser radiation. There are no serviceable parts inside the
device.
v Use of controls or adjustments or performance of procedures other than those
specified herein might result in hazardous radiation exposure.
Danger
Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the
following.
Laser radiation when open. Do not stare into the beam, do not view directly with optical
instruments, and avoid direct exposure to the beam.
The following sections briefly discuss the types of interface ports.

Host ports

DS4300 controller host ports are used for data transfer between hosts (servers) and
the RAID controllers in the DS4300 Storage Subsystem. Each controller has two
independent host ports in a switched (not a hub) implementation. To ensure
redundancy, you must connect each host to both controllers through the appropriate
port. The DS4300 with dual controllers (model 60X/U) support a maximum of two
hosts redundantly directly connected to it. To support more host connections, one
can connected the DS4300 host ports and the servers to the FC switches in a SAN.
The DS4300 single controller supports a maximum of two hosts non-redundantly
connected to it.
Chapter 3. Cabling the storage subsystem
31