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Chapter 4 Connect the Front End
96
Storage Center SC8000 Controller Deployment Guide
Multipath IO
Multipath
IO
(MPIO)
allows
a
server
to
use
multiple
paths
for
IO
if
they
are
available.
MPIO
software
offers
redundancy
at
the
path
level.
MPIO
loads
as
a
driver
on
the
server,
and
typically
operates
in
a
round
‐
robin
manner
by
sending
packets
first
down
one
path
and
then
the
other.
If
a
path
fails,
MPIO
software
continues
to
send
packets
down
the
functioning
path.
MPIO
is
operating
‐
system
specific.
MPIO Behavior for Dual-Controller Storage Centers
When
MPIO
is
configured,
a
server
can
send
IO
to
both
controllers.
However,
a
single
volume
is
owned
by
one
controller
at
a
time.
Even
if
there
are
active
paths
from
a
server
to
both
controllers,
IO
for
a
single
volume
is
always
processed
by
one
controller.
This
limitation
only
applies
to
individual
volumes.
If
a
server
has
two
or
more
volumes
owned
by
different
controllers,
the
server
can
send
IO
to
both
controllers.
MPIO Configuration Instructions for Servers
To
use
MPIO,
configure
MPIO
on
the
server
prior
to
connecting
the
Storage
Center
front
end.
Depending
on
the
operating
system,
this
may
require
installing
MPIO
software
or
may
only
require
setting
server
options.
To
configure
MPIO
on
a
server,
see
the
Dell
Compellent
document
that
corresponds
to
the
server
operating
system.
Front-End Connectivity Modes
Storage
Center
uses
either
legacy
mode
or
virtual
port
mode
to
transport
data
to
servers
that
use
SAN
storage.
In
legacy
mode,
front
‐
end
IO
ports
are
configured
in
pairs
of
primary
and
reserved
ports.
In
virtual
port
mode,
all
ports
are
active,
and
if
one
port
fails
the
load
is
distributed
between
the
remaining
ports
within
the
same
fault
domain.
The
front
‐
end
connectivity
mode
is
configured
independently
for
Fibre
Channel
and
iSCSI.
Both
transport
types
can
be
configured
to
use
the
same
mode
or
different
modes
to
meet
the
needs
of
the
network
infrastructure.
For
example,
a
Storage
Center
can
be
configured
to
use
virtual
port
mode
for
FC
and
legacy
mode
for
iSCSI.
Operating System
Document with MPIO Instructions
IBM
AIX
Dell
Compellent
AIX
Best
Practices
Linux
• Dell
Compellent
Storage
Center
Linux
Best
Practices
• Dell
Compellent
Best
Practices:
Storage
Center
with
SUSE
Linux
Enterprise
Server
11
VMware
vSphere
5.x
Dell
Compellent
Storage
Center
Best
Practices
with
vSphere
5.x
Windows
Server
2003
Storage
Center
Multipath
IO
(MPIO)
Manager
for
Microsoft
Servers
User
Guide
Windows
Server
2008,
2008
R2,
and
2012
Dell
Compellent
Storage
Center
Microsoft
Multipath
IO
(MPIO)
Best
Practices
Guide
Note:
In
Legacy
mode,
reserve
ports
and
primary
ports
reside
on
separate
controllers,
providing
controller
‐
level
failover
only.
Legacy
mode
does
not
provide
port
‐
level
failover.
Содержание SC8000
Страница 1: ...Dell Compellent Storage Center SC8000 Controller Deployment Guide ...
Страница 64: ...Chapter 2 Install the Hardware 54 Storage Center SC8000 Controller Deployment Guide ...
Страница 163: ...Complete the Startup Wizard Dell Compellent 153 6 Click Continue The Generate SSL Cert page appears ...
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Страница 218: ...680 087 001 D ...