IBM 8671 Hardware Maintenance Manual - Page 121

cabling, requirements

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v Domain name validation to negotiate compatible data-transfer speeds with each device v Parity checking to ensure data reliability v An active terminator for SCSI bus termination The server comes with one SCSI cable that is connected from the internal SCSI channel A connector to the standard hot-swap-drive backplane. You can attach additional internal SCSI devices to the other internal SCSI channel B connector, or you can use channel B for external SCSI devices. To use channel B for external SCSI devices, remove the external SCSI knockout from the rear of the server (see "Cabling the server" on page 106 for external SCSI knockout location) and secure the free end of an optional channel B cable in the new opening. If you want to attach external SCSI devices to the server without using the internal SCSI channel B, you must install an optional SCSI adapter. Notes: 1. External SCSI devices connected to internal SCSI channel B will operate asynchronously. 2. If you install a PCI RAID adapter to configure and manage the internal hot-swap drives, you must move the SCSI cable from the system-board SCSI connector to an internal channel connector on the RAID adapter (except for the ServeRAID-5i controller, which uses the system-board integrated SCSI controller with RAID capabilities). See "Cabling example for a ServeRAID controller" on page 66 for additional information. Note: If you install a PCI RAID adapter to configure and manage the internal hot-swap drives, you must move the SCSI cable from the system-board SCSI connector to an internal channel connector on the RAID adapter (except for the ServeRAID-5i controller, which uses the system-board integrated SCSI controller with RAID capabilities). See "Cabling example for a ServeRAID controller" on page 66 for additional information. SCSI cabling requirements For information about the maximum length of SCSI cable, see the American National Standards Institute (ANSI) SCSI standards on the ANSI Web site at http://www.ansi.org/ on the World Wide Web. Adhering to these standards will help to ensure that your server operates properly. SCSI IDs Each SCSI device that is connected to a SCSI controller must have a unique SCSI ID. This ID enables the SCSI controller to identify the device and ensure that different devices on the same SCSI channel do not attempt to transfer data simultaneously. SCSI devices that are connected to different SCSI channels can have duplicate SCSI IDs. Table 8 on page 112 and Table 9 on page 112 list the SCSI IDs for the hard disk drives and backplanes that are connected to one channel. In the typical configuration, the standard hard disk drives and backplane are connected to channel A, and the optional 3-Pack hard disk drives and backplane are connected to channel B. See "Working with the 3-Pack Ultra320 Hot-Swap Expansion option" on page 70 for instructions for installing the 3-Pack option, and "Installing internal drives" on page 74 for instructions about installing hard disk drives. Chapter 4. Customer replaceable units 111

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v
Domain
name
validation
to
negotiate
compatible
data-transfer
speeds
with
each
device
v
Parity
checking
to
ensure
data
reliability
v
An
active
terminator
for
SCSI
bus
termination
The
server
comes
with
one
SCSI
cable
that
is
connected
from
the
internal
SCSI
channel
A
connector
to
the
standard
hot-swap-drive
backplane.
You
can
attach
additional
internal
SCSI
devices
to
the
other
internal
SCSI
channel
B
connector,
or
you
can
use
channel
B
for
external
SCSI
devices.
To
use
channel
B
for
external
SCSI
devices,
remove
the
external
SCSI
knockout
from
the
rear
of
the
server
(see
“Cabling
the
server”
on
page
106
for
external
SCSI
knockout
location)
and
secure
the
free
end
of
an
optional
channel
B
cable
in
the
new
opening.
If
you
want
to
attach
external
SCSI
devices
to
the
server
without
using
the
internal
SCSI
channel
B,
you
must
install
an
optional
SCSI
adapter.
Notes:
1.
External
SCSI
devices
connected
to
internal
SCSI
channel
B
will
operate
asynchronously.
2.
If
you
install
a
PCI
RAID
adapter
to
configure
and
manage
the
internal
hot-swap
drives,
you
must
move
the
SCSI
cable
from
the
system-board
SCSI
connector
to
an
internal
channel
connector
on
the
RAID
adapter
(except
for
the
ServeRAID-5i
controller,
which
uses
the
system-board
integrated
SCSI
controller
with
RAID
capabilities).
See
“Cabling
example
for
a
ServeRAID
controller”
on
page
66
for
additional
information.
Note:
If
you
install
a
PCI
RAID
adapter
to
configure
and
manage
the
internal
hot-swap
drives,
you
must
move
the
SCSI
cable
from
the
system-board
SCSI
connector
to
an
internal
channel
connector
on
the
RAID
adapter
(except
for
the
ServeRAID-5i
controller,
which
uses
the
system-board
integrated
SCSI
controller
with
RAID
capabilities).
See
“Cabling
example
for
a
ServeRAID
controller”
on
page
66
for
additional
information.
SCSI
cabling
requirements
For
information
about
the
maximum
length
of
SCSI
cable,
see
the
American
National
Standards
Institute
(ANSI)
SCSI
standards
on
the
ANSI
Web
site
at
on
the
World
Wide
Web.
Adhering
to
these
standards
will
help
to
ensure
that
your
server
operates
properly.
SCSI
IDs
Each
SCSI
device
that
is
connected
to
a
SCSI
controller
must
have
a
unique
SCSI
ID.
This
ID
enables
the
SCSI
controller
to
identify
the
device
and
ensure
that
different
devices
on
the
same
SCSI
channel
do
not
attempt
to
transfer
data
simultaneously.
SCSI
devices
that
are
connected
to
different
SCSI
channels
can
have
duplicate
SCSI
IDs.
Table
8
on
page
112
and
Table
9
on
page
112
list
the
SCSI
IDs
for
the
hard
disk
drives
and
backplanes
that
are
connected
to
one
channel.
In
the
typical
configuration,
the
standard
hard
disk
drives
and
backplane
are
connected
to
channel
A,
and
the
optional
3-Pack
hard
disk
drives
and
backplane
are
connected
to
channel
B.
See
“Working
with
the
3-Pack
Ultra320
Hot-Swap
Expansion
option”
on
page
70
for
instructions
for
installing
the
3-Pack
option,
and
“Installing
internal
drives”
on
page
74
for
instructions
about
installing
hard
disk
drives.
Chapter
4.
Customer
replaceable
units
111