IRIX
multipathing
does
not
perform
dynamic
load-balancing;
it
only
provides
path
failover.
You
can
achieve
static
load-balancing
if
you
distribute
the
primary
paths
evenly
across
the
controllers
when
you
set
up
the
failover
groups
in
the
/etc/failover.conf
file.
When
a
failover
occurs
to
the
alternate
path,
you
must
use
the
/sbin/scsifo
-d
command
to
manually
return
to
the
primary
path.
When
you
have
a
host
system
with
multiple
host
bus
adapters
or
multiple
paths
to
the
storage,
IRIX
automatically
chooses
the
first
path
it
encounters
in
the
hardware
tree
as
the
path
to
the
storage.
To
prevent
this
from
occurring
when
you
perform
a
static
load-balance,
you
must
configure
the
failover.conf
file
to
point
the
I/O
operations
to
the
correct
path.
This
ensures
that
you
assign
a
failover
path
or
a
backup
path
for
all
I/O
operations.
Host
failover
using
IRIX
multipathing
requires
the
use
of
the
XLV
volume
manager
or
in
the
case
of
IRIX
clusters,
the
XVM
volume
manager.
Confirming
the
availability
of
failover
Confirming
the
availability
of
failover.
1.
Use
the
chkconfig
command
to
determine
if
failover
is
enabled.
2.
If
failover
is
not
enabled,
turn
it
on
and
start
the
failover
script
or
restart
the
server.
Figure
73
shows
an
example
of
what
commands
to
type
if
failover
is
disabled.
Making
a
connection
through
a
switched-fabric
topology
Making
a
connection
through
a
switched-fabric
topology
1.
Edit
the
/etc/failover.conf
file
to
add
primary
and
secondary
paths
to
the
storage
unit
LUNs.
“Confirming
storage
connectivity
for
SGI
in
a
switched-fabric
topology”
on
page
153
describes
the
paths
of
the
character-special
files.
These
files
begin
with
the
worldwide
node
name
of
the
storage
unit.
Figure
74
on
page
156
shows
an
example
of
an
edited
/etc/failover.conf
file.
#chkconfig
|
grep
failover
failover
off
#chkconfig
failover
on
#/etc/init.d/failover
init
#Configuring
Failover.
Figure
73.
Example
of
commands
to
turn
failover
on
Chapter
17.
Attaching
an
SGI
host
system
155
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