IBM System Storage DS5020, Installation, User'S, And Maintenance Manual

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Each controller for the DS5020 has Fibre Channel or iSCSI drive ports for
connecting to the storage expansion enclosures and two Ethernet ports for DS5020
subsystem management. See Figure 2 on page 11, Figure 3 on page 12, or
Figure 4 on page 12.
The iSCSI ports support both IPv4 and IPv6 TCP/IP addresses, CHAP, and iSNS.
Use either Cat5E or Cat6 Ethernet cable types for iSCSI port connections. A Cat6
Ethernet cable provides optimal performance.
Although both controllers (A and B) are identical, they are seated in the DS5020
chassis in opposite orientations. If the controller cannot fully be inserted in the
controller bay, flip it 180 degrees and reinsert it. Do not force fit because it might
cause damage to the controller unit.
Connectors, switch, and enclosure ID
The controllers support fiber-optic interfaces for both the host channel and drive
channel ports. The controllers also contain two Ethernet ports for storage
subsystem management purposes and a serial port that IBM Support uses to
perform problem recovery and troubleshooting procedures.
The default IP addresses and subnet masks are shown in Table 2.
Table 2. Default IP addresses and subnet masks
Port IP address Subnet mask
Controller A management
port 1 192.168.128.101 255.255.255.0
Controller A management
port 2 192.168.129.101 255.255.255.0
Controller B management
port 1 192.168.128.102 255.255.255.0
Controller B management
port 2 192.168.129.102 255.255.255.0
Controller A iSCSI port 1 192.168.130.101 255.255.255.0
Controller A iSCSI port 2 192.168.131.101 255.255.255.0
Controller B iSCSI port 1 192.168.130.102 255.255.255.0
Controller B iSCSI port 2 192.168.131.102 255.255.255.0
See “Setting up IP addresses for DS5020 storage controllers” on page 12 for more
information.
The enclosure ID, comprised of two seven-segment numbers, is located on the
back of each controller next to the controller indicator lights. The two digits that
comprise the enclosure ID are referred to as x10 and x1 digits. The enclosure ID
provides a unique identifier for each enclosure in the storage subsystem. The
storage management software automatically sets the enclosure ID number. You can
only change the enclosure ID setting through the DS Storage Manager software.
There are no switches on the DS5020 chassis to manually set the enclosure ID.
Both controller enclosure ID numbers will be identical under normal operating
conditions. The default setting of the enclosure ID is a value of 85.
Storage expansion enclosures in a DS5020 storage subsystem must also have
unique enclosure IDs. In addition to having unique enclosure IDs for each storage
expansion enclosure (including the DS5020 storage subsystems with drives
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IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide