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Important:
1. The serial interface ports are intended to be used by service technicians to
perform diagnostic operations on the storage subsystem. Incorrect use of the
serial port can result in loss of data access and, in some cases, in loss of data.
Do not make connections to the serial port unless you do so under the direct
supervision and guidance of IBM support personnel. The serial port connection
requires a special PS2 DIN to DB9 male converter. (IBM Service and support
personnel, see the Serial cable adapter (RoHS) in “Parts listing” on page 160
for the FRU P/N.)
2. To minimize security risks, do not connect the DS5020 in a public LAN or public
subnet. Use a local private network for the DS5020 and the management
station Ethernet ports.
3. For proper EMI shielding, always use quality braided and shielded serial cables.
Connect a pair of Ethernet cables from the storage-management station to the
Ethernet ports for controller A (located on the top) and controller B (located on the
bottom) on the back of the storage subsystem. Figure 51 shows the location of the
ports on the DS5020 storage subsystem. Only one Ethernet port connection from
each controller is required to establish a direct (out-of-band) management
connection to the DS5020 storage subsystem.
Notes:
1. The alignment of the Ethernet and serial ports on controller A are opposite those
of controller B. Before inserting an Ethernet or serial cable, verify that the cable
connection is rotated correctly to match the alignment of the port on the RAID
controller. Do not force-fit.
2. Your DS5020 hardware might differ slightly from the following illustration.
Configuring the storage subsystem
You must configure the storage subsystem configuration after you install the storage
subsystem in a rack cabinet. Use the information in the following sections to
configure your storage subsystem configuration.
Ethernet
ports
Serial
port
Ethernet
ports
Serial
port
Figure 51. Ethernet and serial port locations on DS5020
Chapter 3. Cabling the storage subsystem 79