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12. Connect port 2 of drive channel 2 on the DS4200 Express to port 1B ( 1 ) on
Storage expansion enclosure settings
This section provides information about storage expansion enclosure settings. For
additional detail, refer to the Installation, User's, and Maintenance Guide for your
storage expansion enclosure.
Fibre channel loop and ID settings
When you install a hard disk drive in the storage expansion enclosure, the drive
tray plugs into a printed circuit board called the midplane. The midplane sets the
fibre channel loop ID automatically, based on the enclosure ID switch setting and
the physical location (bay) of the hard disk drive.
DS4000 storage expansion enclosure ID settings
Some DS4000 storage expansion enclosures, such as the EXP420, do not have an
enclosure ID switch because the controller and storage expansion enclosure ESMs
automatically set the enclosure ID number. Other DS4000 storage expansion
enclosures, such as the EXP100, have an enclosure ID switch that is used to
identify the DS4000 storage expansion enclosure on a fibre channel loop. The
enclosure ID switch is located on the back of the unit.
Note: The initial release of the DS4200 Express supports the EXP420 storage
Connecting secondary interface cables
This section is applicable to (direct) out-of-band management configurations only. If
your configuration uses host-agent (in-band) management, skip this section.
Use the Ethernet interface ports on the back of the storage subsystem to connect
the controllers for direct management of the storage subsystems (see "Direct
(out-of-band) management method" on page 71).
Important:
1. The serial interface ports are intended to be used by service technicians to
2. To minimize security risks, do not connect the DS4200 Express in a public LAN
3. To ensure proper EMI shielding, always use quality braided and shielded serial
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 on page 70 shows the
location of the ports on the DS4200 Express Storage Subsystem. Only one
the right ESM in the sixth EXP420 ( 7 ).
expansion enclosure only. The enclosure ID on the EXP420 is automatically
set by the controller and ESMs so you do not have to manually set it.
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 Serial cable adapter (RoHS) in "Parts listing" on page 140 for
FRU P/N.)
or public subnet. Use a local private network for the DS4200 Express and the
management station Ethernet ports.
cables.
Chapter 3. Cabling the storage subsystem
69
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