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and
RAID
controllers.
The
expansion
drive
(or
storage
expansion
enclosure)
fibre
channel
loop
provides
the
fibre
path
to
the
hard
disk
drives
(HDDs)
that
are
outside
the
DS4300
storage
subsystem
chassis.
The
drive
fibre
channel
loop
consists
of
fibre
channel
HDDs
and
optional
DS4000
EXP
storage
expansion
enclosures,
fibre
channel
cables,
and
SFPs.
The
DS4300
dual-controller
storage
subsystem
(Model
60U/60X)
supports
redundant
disk-drive-loop
configurations.
You
can
build
a
redundant
drive
loop
by
connecting
one
or
more
DS4000
EXP
storage
expansion
enclosures
to
the
redundant
RAID
controllers.
Then,
use
dual
fiber-optic
cables
to
connect
one
storage
expansion
enclosure
to
another
in
a
daisy-chain.
For
more
information
about
adding
storage
expansion
enclosures,
see
“Connecting
storage
expansion
enclosures
to
the
DS4300”
on
page
45.
Redundant
drive
loop
cabling
overview
The
DS4300
with
dual
controllers
storage
subsystem
supports
one
redundant
drive
loop.
A
redundant
drive
loop
consists
of
one
or
more
storage
expansion
enclosures
connected
to
a
controller
using
two
sets
of
fibre
channel
cables.
If
one
data
path
fails,
the
controller
uses
the
other
data
path
to
maintain
the
connection
to
the
drive
group.
Figure
36
shows
a
storage
subsystem
containing
one
storage
subsystem
and
one
redundant
drive
loops
with
four
storage
expansion
enclosures.
Each
storage
expansion
enclosures
group
uses
redundant
drive
loops
to
connect
to
the
DS4300
Storage
Subsystem.
Attention:
To
prevent
loss
of
storage
expansion
enclosure
redundancy,
connect
the
storage
expansion
enclosures
as
shown
in
Figure
36.
Note:
The
illustrations
in
this
document
might
differ
slightly
from
the
hardware.
d43nu4041
Storage
expansion
enclosure
group 1
Loop A
Loop B
Storage
Subsystem
Figure
36.
Redundant
drive
loop
cabling
overview
44
IBM
TotalStorage
DS4300
Fibre
Channel
Storage
Subsystem:
Installation,
User’s,
and
Maintenance
Guide
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Содержание TotalStorage DS4300 Turbo
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