IBM 8840 Hardware Maintenance Manual - Page 67

cabling, requirements, connector

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v Domain-name validation to negotiate compatible data-transfer speeds with each device v Cyclic redundancy checking (CRC), instead of the usual parity checking, to improve data reliability v An active terminator for SCSI bus termination The server comes with one SCSI cable, which connects the internal connector on the system board to the standard hot-swap-drive backplane. If you plan to attach external SCSI devices, you must order additional cables. To select and order the correct cables for use with external devices, contact your IBM marketing representative or authorized reseller. SCSI cabling requirements For information about the maximum length of SCSI cable, go to the American National Standards Institute (ANSI) SCSI standards on the ANSI Web site at http://www.ansi.org/. Adhering to these standards will help to ensure that the 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 6 lists the SCSI IDs for the hard disk drives and backplanes that are connected to one channel. Table 6. SCSI IDs for standard hot-swap hard disk drives, controller, and backplane Device SCSI ID Drive bay 1 0 Drive bay 2 1 Drive bay 3 2 Drive bay 4 3 Drive bay 5 4 Drive bay 6 5 Controller 7 Backplane 8 The hot-swap-drive backplane controls the SCSI IDs for the internal hot-swap drive bays. However, when you attach an external SCSI device to an optional SCSI adapter, you must set a unique ID for the device. See the information that comes with the device for instructions for setting its SCSI ID. SCSI connector The following illustration shows a SCSI connector. 34 1 68 35 Chapter 4. Installing options 57

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v
Domain-name
validation
to
negotiate
compatible
data-transfer
speeds
with
each
device
v
Cyclic
redundancy
checking
(CRC),
instead
of
the
usual
parity
checking,
to
improve
data
reliability
v
An
active
terminator
for
SCSI
bus
termination
The
server
comes
with
one
SCSI
cable,
which
connects
the
internal
connector
on
the
system
board
to
the
standard
hot-swap-drive
backplane.
If
you
plan
to
attach
external
SCSI
devices,
you
must
order
additional
cables.
To
select
and
order
the
correct
cables
for
use
with
external
devices,
contact
your
IBM
marketing
representative
or
authorized
reseller.
SCSI
cabling
requirements
For
information
about
the
maximum
length
of
SCSI
cable,
go
to
the
American
National
Standards
Institute
(ANSI)
SCSI
standards
on
the
ANSI
Web
site
at
Adhering
to
these
standards
will
help
to
ensure
that
the
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
6
lists
the
SCSI
IDs
for
the
hard
disk
drives
and
backplanes
that
are
connected
to
one
channel.
Table
6.
SCSI
IDs
for
standard
hot-swap
hard
disk
drives,
controller,
and
backplane
Device
SCSI
ID
Drive
bay
1
0
Drive
bay
2
1
Drive
bay
3
2
Drive
bay
4
3
Drive
bay
5
4
Drive
bay
6
5
Controller
7
Backplane
8
The
hot-swap-drive
backplane
controls
the
SCSI
IDs
for
the
internal
hot-swap
drive
bays.
However,
when
you
attach
an
external
SCSI
device
to
an
optional
SCSI
adapter,
you
must
set
a
unique
ID
for
the
device.
See
the
information
that
comes
with
the
device
for
instructions
for
setting
its
SCSI
ID.
SCSI
connector
The
following
illustration
shows
a
SCSI
connector.
34
1
68
35
Chapter
4.
Installing
options
57