If
the
auto-negotiation
process
fails,
the
controllers
will
consider
the
link
to
be
down
until
negotiation
is
again
attempted
at
one
of
these
points
in
time.
For
a
4
Gbps
controller,
the
supported
host-channel
link
speeds
are
1,
2,
and
4
Gbps.
Ethernet
ports
The
Ethernet
connections
provide
for
out-of-band
management
configurations
to
a
host.
The
Ethernet
ports
are
used
for
an
RJ-45
10BASE-T
or
100BASE-T
Ethernet
connection
to
each
controller.
Use
the
Ethernet
connection
to
directly
manage
the
DS4800.
Use
one
Ethernet
port
for
daily
management
of
the
DS4800.
Reserve
the
other
port
for
use
by
service
personnel
or
for
subsystem
monitoring
hardware
that
may
be
available
in
the
future.
The
two
Ethernet
ports
must
be
connected
into
networks
with
two
separate
subnet
masks.
Otherwise,
the
following
Recovery
Guru
error
will
be
generated:
Ethernet
Configuration
conflict.
Both
Ethernet
ports
for
a
given
DS4800
controller
have
been
assigned
IP
addresses
from
the
same
subnet.
You
can
also
make
out-of-band
management
connections
to
the
DS4800
controllers
using
the
default
IP
addresses.
The
default
IP
addresses
for
the
controller
A
Ethernet
ports
1
and
2
are
192.168.128.101
and
192.168.129.101,
respectively.
The
default
IP
addresses
for
the
controller
B
Ethernet
ports
1
and
2
are
192.168.128.102
and
192.168.129.102,
respectively.
The
default
subnet
mask
for
all
four
Ethernet
ports
is
255.255.255.0.
RS-232
serial
port
The
RS-232
serial
connection
provides
a
diagnostic
port
for
use
by
service
personnel
only
to
perform
diagnostic
operations
on
the
RAID
controllers.
Attention:
Incorrect
use
of
the
serial
port
can
result
in
loss
of
data
access
and,
in
some
cases,
in
loss
of
data.
Do
not
make
any
connections
to
the
serial
port
unless
you
do
so
under
the
direct
guidance
of
IBM
support
personnel.
Note:
The
maximum
baud
rate
is
115
200
bps.
The
default
baud
rate
setting
from
the
factory
is
38
400
bps.
Controller
memory
Each
RAID
controller
has
up
to
8
GB
of
data
cache
memory,
for
a
total
of
up
to
16
GB
cache
memory
per
DS4800.
Each
RAID
controller
also
has
a
total
of
either
512
MB
(for
models
80A/H,
82A/H
or
84A/H)
or
1024MB
(for
models
88A/H)
of
Intel
Pentium
Xeon
processor
memory.
The
processor
memory
stores
the
controller
firmware,
while
the
data
cache
is
a
buffer
used
to
temporarily
store
hard
disk
drive
data
during
data
read
and
write
operations.
A
Cache
Active
LED
on
the
controller
turns
on
when
the
cache
contains
data
that
has
not
been
written
to
hard
disk
drives.
The
Cache
Active
LED
turns
off
when
the
cache
does
not
contain
unwritten
data.
14
IBM
System
Storage
DS4800
Storage
Subsystem:
Installation,
User’s,
and
Maintenance
Guide
Содержание TotalStorage DS4800
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Страница 55: ...ds48020 Figure 12 DS4800 front rack mounting template Chapter 2 Installing the storage subsystem 33...
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Страница 205: ...ds48021 Figure 102 DS4800 rear rack mounting template Appendix C Rack mounting templates 183...
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Страница 234: ...Part Number 23R1992 Printed in USA GC26 7845 00 1P P N 23R1992...
