IBM System Storage DS3000, Programming Manual

Page: 390 / 652

Controller A has drive channels 1, 2, 3, and 4. Controller A drive port pairs, labeled 8 and 7, 6 and 5, 4
and 3, and 2 and 1, connect to controller A drive channels 1, 2, 3 and 4, respectively. Similarly, controller
B also has four drive channels, labeled as channels 5, 6, 7, and 8. Controller B drive port pairs, labeled 1
and 2, 3 and 4, 5 and 6, and 7 and 8, connect to controller B drive channels 5, 6, 7 and 8, respectively.
Each Ethernet port on a controller can have a unique IP address; however, both Ethernet ports share the
same gateway IP address and remote login settings.
Disk Drives
The disk drives provide the actual storage of the data that is sent to the storage subsystem. The disk
drives are mounted in an expansion drawer. The expansion drawer is an enclosure that, in addition to the
disk drives, contains power supplies, fans, environmental cards, and other supporting components.
Disk drives are located in a storage subsystem by enclosure ID and slot ID. Enclosure ID values are
0
to
99
. In older enclosures, enclosure ID values are set during installation by switches on the rear of the
enclosures. In newer enclosures, enclosure ID values are set automatically when the power is applied.
The slot ID is the disk drive position in the expansion drawer. Slot ID values range from
1
to
16
. An
expansion drawer can contain either 10, 12, 14, or 16 disk drives. The total number of disk drives in a
storage subsystem depends on the model of the controller and the type of expansion drawer.
Note: A maximum of seven expansion drawers can be on a channel when mixing 14-slot expansion
drawers and 16-slot expansion drawers.
The following table lists, by controller number and expansion drawer capacity, the maximum number of
disk drives in a storage subsystem.
Note: There are maximum limits to the number of Fibre Channel hard drives that you can configure in
redundant drive loop pairs. The maximum number of drives dictates a fixed number of supported
14-disk and 16-disk drive enclosure combinations. For more information, please refer to Chapter 1 of the
DS4000 Hard Drive and Storage Expansion Enclosure Installation and Migration Guide .
Table 4-2. Maximum Number of Disk Drives
Controller
Model
10-Disk Drive
Expansion
Drawer 12-Disk Drive
Expansion
Drawer 14-Disk Drive
Expansion
Drawer 16-Disk Drive
Expansion
Drawer
12– or 24–Disk
Drive
Expansion
Enclosure
60-Disk
Expansion
Enclosure
DS3200 48
DS3300 48
DS3400 48
DS3500 192
1
DCS3700 180
1 2
3
1 2 3 4
4
Host ports
ds5_022309
5 6 7 8
5 6 7
8
Host ports
A
B
Figure 4-10. DS5300 / DS5100 Host Ports
4-8
IBM System Storage DS3000, DS4000, and DS5000: Command Line Interface and Script Commands Programming Guide