IBM System Storage DS3000, Programming Manual

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Controller models DS4400 and DS4500 use minihubs; two connected to each controller. When viewed
from the rear of the controller module, the host-side minihubs are numbered from left-to-right a1, b1, a2,
b2. The script commands identify the host channels by using these identifiers. Minihubs also supported
the drive-side, where each minihub represents a single channel to the disk drives. When viewed from the
rear of the controller module, the disk drive minihubs are numbered from left to right 4, 3, 2, 1. The
script commands use these numbers to identify the disk drive channels.
Controllers manage the interface by using the controller firmware to transmit and receive commands
between the hosts and the disk drives. Host bus adapters facilitate the communication through whatever
interface is selected. Typically, two host bus adapters and two paths are used to optimize redundancy.
These controller modules and controller modules incorporate all host connections and expansion drawer
connections into each controller. The host ports must be identified in your command statements to let
you complete their network configurations.
The more recent controllers do not use minihubs. These controllers have host ports that are integrated
into the controller circuit boards or auxiliary circuit boards that are directly connected to the controller
circuit boards.
The following table lists the controller modules that do not use minihubs, the type of host port, and the
number of host ports.
Table 4-1. Host Ports and the Type of Host Interfaces on Controller Modules
Model
Available
Host Ports
Per
Controller
Type of Host
Interface
DS3200 controller module (without optional SAS expansion card) 1 SAS
DS3200 controller module (with optional SAS expansion card) 3 SAS
DS3300 controller module 2 iSCSI
DS3400 controller module 2 Fibre Channel
DS3500 series controller module up to 6 Fibre Channel,
SAS, or iSCSI
DCS3700 series controller module up to 6 Fibre Channel,
SAS, iSCSI
1
DCS3700 storage subsystem with Performance Module Controllers controller
module up to 8 Fibre Channel
DS3950 4 Fibre Channel and
iSCSI
DS4100, DS4200, and DS4300 2 Fibre Channel
DS4700 (model 70) controller module 2 Fibre Channel
DS4700 (model 72) controller module 4 Fibre Channel
DS4400, DS4500, and DS4800 4 Fibre Channel
DS5020 4 Fibre Channel and
iSCSI
DS5100 and DS5300 up to 8 Fibre Channel and
iSCSI
1
iSCSI will be supported in a future update.
Chapter 4. Configuring a Storage Subsystem
4-3