v
Fabric
Shortest
Path
First
(FSPF)
rerouting
around
failed
links
v
Integration
with
SNMP
managers
The
high-availability
software
architecture
of
these
switches
provides
a
common
framework
for
all
applications
that
reside
on
the
system,
allowing
global
and
local
states
to
be
maintained
enough
to
manage
any
component
failure.
High-availability
elements
consist
of
the
High
Availability
Manager,
the
heartbeat,
the
fault/health
framework,
the
replicated
database,
initialization,
and
software
upgrade.
The
High
Availability
manager:
v
Controls
access
to
the
standby
CP
v
Facilitates
software
upgrades
v
Prevents
extraneous
switch-over
activity
v
Closes
and
flushes
streams
as
needed
v
Provides
flow
control
and
message
buffering
v
Supports
a
centralized
active
and
standby
state
allowing
the
switch
of
activity
to
be
controlled
from
a
single
point.
Reliability
In
addition
to
being
available,
the
system
must
be
reliable.
This
means
that
some,
if
not
all,
of
its
state
must
be
maintained.
In
a
reliable
system,
you
are
not
aware
of
the
internal
state
of
a
switch,
and
you
experience
continued
system
service
with
zero
degradation.
The
M12
and
M14
switches
provide
the
following
features
to
ensure
reliability:
v
Power-on
self
test
(POST).
v
An
error
detection
and
correction
mechanism
to
protect
all
data
in
the
switch.
v
Error
detection
and
fault
isolation,
such
as
cyclic
redundancy
checking
(CRC),
parity
checking,
checksum,
and
illegal
address
checking.
v
Dual
CPs
that
enable
hot,
nondisruptive
fast
firmware
upgrades.
Each
CP
contains
two
serial
ports
and
one
Ethernet
port.
Offline
CP
diagnostics
and
remote
diagnostics
make
troubleshooting
easy.
The
standby
CP
continuously
runs
diagnostics
to
ensure
that
it
is
operational
should
a
failover
be
necessary.
v
Inter-IC
(I
²
C)
monitoring
and
control.
Serviceability
The
M12
and
M14
provide
the
following
features
to
enhance
and
ensure
serviceability:
v
Modular
design
with
hot-swappable
components
v
Redundant
flash
memory
that
stores
two
firmware
images
per
CP
v
Extensive
diagnostics
and
status
reporting,
along
with
a
serial
port
to
support
an
external,
country-specific
modem
for
remote
diagnostics
and
status
monitoring
v
Nonvolatile
random-access
memory
(NVRAM)
that
contains
the
OEM
serial
number,
IBM
serial
number,
revision
information,
and
part
number
information
v
Background
health
check
daemon
v
Memory
scrubber,
self
test,
and
bus
ping
to
determine
if
a
bus
is
not
functioning
v
Watchdog
timers
v
Status
LEDs
v
Predictive
diagnostics
analysis
through
Fabric
Watch
6
IBM
TotalStorage
SAN
Switch:
2109
Model
M12
and
Model
M14
User’s
Guide
Summary of Contents for TotalStorage 2109 M12
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