Overview, Cabling, Ds4500 – IBM TOTALSTORAGE DS4500 User Manual
Page 8: With, Drive, Mini, Hubs
Attention:
Previous
DS4500
cabling
documentation
identified
incorrectly
the
connections
of
drive
loops
B
and
C
in
DS4500
configurations
with
four
drive
mini
hubs
installed.
Drive
loop
B
was
incorrectly
shown
as
connecting
to
mini
hub
3
and
drive
loop
C
was
incorrectly
shown
as
connecting
to
mini
hub
2.
Do
not
use
the
incorrect
connections
for
drive
loops
B
and
C
that
are
currently
documented
in
the
original
IBM
TotalStorage
DS4500
Fibre
Channel
Cabling
Instructions
(pn
25R0406)
and
the
IBM
TotalStorage
DS4500
Installation
and
Support
Guide.
For
reference,
this
incorrect
connection
scheme
is
shown
in
Instead,
use
the
correct
connections
(drive
loop
B
connects
to
mini
hub
2
and
drive
loop
C
connects
to
mini
hub
3)
as
shown
in
and
as
described
in
of
this
document.
Overview:
Cabling
a
DS4500
with
two
drive
mini
hubs
Review
the
following
information
carefully
and
then
continue
to
perform
the
drive-side
cabling
for
your
DS4500
Storage
Subsystem.
The
DS4500
Storage
Server
is
currently
shipped
from
the
factory
with
two
drive
mini
hubs
installed
in
mini
hub
slots
4
and
2
as
a
standard
option.
Previously,
these
two
mini
hubs
were
installed
in
mini
hub
slots
1
and
2.
If
the
DS4500
Storage
Subsystem
is
shipped
with
two
drive
mini
hubs
installed
in
mini
hub
slots
4
and
2,
cable
the
storage
expansion
enclosures
as
shown
by
“Storage
Expansion
Enclosures
-
Group
1”
in
using
the
instructions
in
If
this
is
a
new
DS4500
Storage
Subsystem
configuration
and
the
DS4500
is
shipped
with
two
drive
mini
hubs
installed
in
mini
hub
slots
1
and
2,
IBM
recommends
that
you
remove
the
mini
hub
from
slot
1
(the
right
most-position)
and
swap
it
with
the
blank
mini
hub
inserted
in
drive
mini
hub
slot
4
(the
left-most
position).
Then
cable
the
storage
expansion
enclosures
as
shown
by
“Storage
Expansion
Enclosures
-
Group
1”
in
using
the
instructions
in
By
Drive
loop C
Out
Drive loop D
DS4500
Storage Server
In
First storage expansion
enclosure
First storage expansion
enclosure
Drive
loop A
Drive
loop B
ds45cabx
Figure
6.
Incorrect
drive
loop
cabling
in
DS4500
configuration
with
four
drive
mini
hubs
installed
8