Appendix A Adding or Removing an Enclosure
186
Storage Center SC8000 Controller Deployment Guide
Adding to an Existing SAS Enclosure Chain
The
following
example
shows
how
to
insert
an
enclosure
into
an
existing
enclosure
chain
by
connecting
the
enclosure
to
one
side
of
the
enclosure
chain
at
a
time.
During
this
process,
one
side
of
the
enclosure
chain
is
disconnected,
and
the
Storage
Center
fails
over
to
the
side
that
remains
connected.
Check the Lead Controller
Identify
the
lead
controller
by
checking
controller
summary
information
in
System
Manager.
These
cabling
instructions
assume
that
Controller
A
is
the
lead
controller.
1
In
the
Storage
Center
System
Manager,
select
the
Controllers
node.
2
In
the
controller
summary
pane
note
which
controller
is
identified
as
the
leader.
Check Current Disk Count
Check
the
current
number
of
drives
accessible
by
the
Storage
Center
to
use
as
a
comparison
after
a
new
enclosure
is
added.
1
From
a
workstation
connected
to
the
network,
open
the
Storage
Center
System
Manager.
2
In
the
Storage
Center
System
Manager,
select
Storage
Management
→
System
→
Setup
→
Configure Local
Ports
.
3
Maximize
the
Configure
Local
Port
wizard
so
that
you
can
see
the
Target
Count
column,
and
note
the
number
of
drives
currently
viewed
by
the
controllers.
This
number
increases
when
new
enclosures
are
added.
When
adding
enclosures
to
an
existing
configuration,
add
enclosures
to
the
end
of
the
chain.
Add an Enclosure to an Existing Chain Currently in Service
Disconnect
the
chain
one
side
at
a
time
to
maintain
drive
availability
while
adding
an
enclosure.
1
Disconnect
the
A
‐
side
cables
from
the
controllers
as
shown
in
Controller
A,
slot
6
port
1
Controller
B,
slot
6
port
3
IO
continues
through
the
B
‐
side
cables.
2
Turn
on
each
of
the
enclosures
being
added.
When
the
enclosures
spin
up,
make
sure
that
the
front
panel
enclosure
and
power
status
LEDs
show
normal
operation.
3
Move
the
cable
from
Enclosure
2:
top,
port
B
→
Enclosure
4:
top,
port B.
4
Use
new
cables
to
connect
the
new
enclosures
to
the
A
‐
side
cabling
(
Enclosure
2:
top,
port
B
→
Enclosure
3:
top,
port
A.
Enclosure
3:
top,
port
B
→
Enclosure
4,
top,
port
A.
Enclosures
3
and
4
are
now
part
of
the
A
side
chain
and
can
be
connected
to
Controllers
A
and
B.
Caution:
Before
adding
an
enclosure
to
an
existing
chain,
make
sure
that
your
data
is
backed
up.
For
maximum
protection,
add
enclosures
during
a
service
outage.
