Overview, Cabling, Ds4500 – IBM TOTALSTORAGE DS4500 User Manual
Page 6: With, Four, Drive, Mini, Hubs
Overview:
Cabling
a
DS4500
with
four
drive
mini
hubs
Review
the
following
information
carefully
and
then
continue
to
perform
the
drive-side
cabling
for
your
DS4500
Storage
Subsystem.
shows
a
storage
subsystem
containing
one
DS4500
Storage
Subsystem
and
two
redundant
drive
loops
with
four
storage
expansion
enclosures
each.
The
DS4500
configuration
shown
requires
four
drive
mini
hubs
to
be
installed.
Each
storage
expansion
enclosure
group
uses
redundant
drive
loops
to
connect
to
the
DS4500
Storage
Subsystem.
Loop
A
and
loop
B
make
up
one
redundant
pair
of
drive
loops,
which
is
labeled
“Storage
Expansion
Enclosures
-
Group
1.”.
Loop
C
and
loop
D
make
up
a
second
redundant
pair,
which
is
labeled
“Storage
Expansion
Enclosures
-
Group
2.”
Attention:
To
prevent
loss
of
storage
expansion
enclosure
redundancy
in
a
DS4500
Storage
Subsystem
configuration
with
four
drive
mini
hubs
installed,
connect
the
storage
expansion
enclosures
as
shown
in
Note
especially
that
drive
loop
B
connects
to
mini
hub
2
and
drive
loop
C
connects
to
mini
hub
3.
Note:
The
illustrations
in
this
document
might
differ
slightly
from
the
hardware.
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