Connecting
storage
expansion
enclosures
to
the
DS4800
Attention
Before
you
power
on
the
DS4800
Storage
Subsystem,
the
DS4800
must
be
cabled
to
at
least
one
storage
expansion
enclosure
populated
with
at
least
two
drives.
If
at
least
two
drives
are
not
installed
in
each
attached
storage
expansion
enclosure
when
you
power
on
the
DS4800,
your
standard
storage
partition
key
will
be
lost
and
will
need
to
be
regenerated
using
instructions
on
the
IBM
DS4000
Solutions
and
Premium
Features
Web
site:
https://www-912.ibm.com/PremiumFeatures/
Additionally,
if
at
least
two
drives
are
not
installed
in
each
attached
storage
expansion
enclosure,
the
resulting
insufficient
load
to
the
storage
expansion
enclosure
power
supply
CRUs
might
cause
the
drive
expansion
enclosure
power
supply
CRUs
to
intermittently
appear
as
failed
and
then
reappear
in
an
optimal
state,
falsely
indicating
that
the
power
supply
CRUs
are
bad.
In
the
initial
installation
of
the
DS4800,
you
can
add
only
new
storage
expansion
enclosures
to
the
DS4800
Storage
Subsystem.
This
means
that
there
must
be
no
existing
configuration
information
on
the
storage
expansion
enclosures
that
you
want
to
install.
If
the
storage
expansion
enclosures
that
you
want
to
install
currently
contain
logical
drives
or
configured
hot
spares,
and
you
want
them
to
be
part
of
the
DS4800
Storage
Subsystem
configuration,
refer
to
the
IBM
System
Storage
DS4000
Hard
Drive
and
Storage
Expansion
Enclosure
Installation
and
Migration
Guide
.
Improper
drive
migration
might
cause
loss
of
configuration
and
other
storage
subsystem
problems.
Contact
your
IBM
support
representative
for
additional
information.
Redundant
drive
channel
pair
For
the
DS4800,
each
drive
channel
(see
the
Glossary
definitions
for
″
drive
channels
″
and
″
drive
loops
″
)
is
associated
with
two
ports,
and
there
are
two
drive
channels
and
four
associated
ports
per
controller.
The
total
number
of
drives
per
drive
channel
is
112.
One
channel
from
each
controller
combines
to
form
a
pair
of
redundant
drive
channels.
See
for
channel
and
port
labeling
conventions.
In
and
drive
channel
1
of
controller
A
and
drive
channel
3
of
controller
B
combine
to
form
a
DS4800
Storage
Subsystem
drive
channel
pair.
If
any
component
of
drive
channel
1
fails,
the
RAID
controllers
can
still
access
the
storage
expansion
enclosures
in
drive
channel
1
through
drive
channel
3.
Similarly,
drive
channel
2
of
controller
A
and
drive
channel
4
of
controller
B
combine
to
form
the
second
of
the
two
DS4800
Storage
Subsystem
drive
channel
pairs.
If
any
component
of
drive
channel
2
fails,
the
RAID
controllers
can
still
access
the
storage
expansion
enclosures
in
drive
channel
2
through
drive
channel
4.
shows
the
storage
expansion
enclosures
in
each
drive
channel
pairs
connected
to
only
one
drive
port
in
the
two-ported
drive
channel.
For
example,
in
drive
channel
pair
1,
only
port
4
of
channel
1
and
port
1
of
channel
3
are
used.
shows
that
half
of
the
storage
expansion
enclosures
in
each
drive
channel
pair
are
connected
to
the
first
port
of
the
Chapter
3.
Cabling
the
storage
subsystem
59
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