v
When
mixing
different
types
of
storage
expansion
enclosures
in
the
same
drive
channel
pair,
the
Link
Rate
Setting
must
be
set
at
2
Gbps
for
each
storage
expansion
enclosure.
IBM
does
not
support
different
enclosure
speed
settings
in
the
same
drive
loop.
In
addition
to
the
previously
outlined
general
rules,
it
is
strongly
recommended
that
you
observe
the
following
rules
when
connecting
storage
expansion
enclosures
to
the
storage
subsystem:
v
Ensure
that
the
enclosure
ID
of
all
enclosures
in
a
DS4300
storage
subsystem
configuration
(including
the
DS4300
storage
subsystem)
is
unique.
Enclosure
IDs
(sometimes
known
as
tray
IDs)
consist
of
two
digits
(x10
and
x1).
In
14-drive
expansion
enclosures,
the
enclosure
ID
must
be
set
manually.
In
16-drive
expansion
enclosures,
the
enclosure
ID
is
set
automatically.
Refer
to
the
Installation,
User’s,
and
Maintenance
Guide
for
your
appropriate
enclosure
for
information
on
how
to
manually
set
the
switches.
If
the
enclosure
IDs
are
not
unique,
an
error
will
be
posted
in
the
DS4300
subsystem
Major
Event
Log
(MEL)
and
the
ID
conflict
LED
on
the
enclosure
with
same
enclosure
ID
will
be
lit.
In
addition,
ensure
that
the
single
digit
(x1)
of
the
enclosure
ID
for
every
enclosure
(including
the
DS4300
storage
subsystem)
in
a
redundant
drive
loop
pair
is
unique.
If
you
do
not
set
the
single
digit
of
the
enclosure
IDs
to
be
unique
among
enclosures
in
a
redundant
drive
loop
pair,
then
drive
loop
errors
might
be
randomly
posted
in
the
DS4300
subsystem
Major
Event
Log
(MEL).
For
example,
with
four
enclosures
attached
to
the
DS4300,
the
correct
enclosure
ID
settings
should
be
x1,
x2,
x3,
and
x4
(where
x
can
be
any
digit
that
can
be
set).
Examples
of
incorrect
settings
would
be
11
,
21
,
31
,
and
41
or
12
,
22
,
32
,
and
62
.
These
examples
are
incorrect
because
the
x1
digits
are
the
same
in
all
enclosure
IDs
(either
1
or
2
).
Important:
Changing
enclosure
IDs
on
14-drive
enclosures
with
the
mechanical
enclosure
ID
switch
requires
the
power
cycle
of
the
DS4300
subsystem
and
all
enclosures
in
the
configuration
to
activate
the
new
settings.
Changing
the
enclosure
IDs
on
16-drive
enclosures
(EXP810s)
does
not
require
the
power
cycle
of
all
enclosures
and
the
DS4300
subsystem.
If
the
enclosure
IDs
in
your
DS4000
subsystem
configuration
are
not
currently
set
to
have
unique
single
digit
values
for
the
enclosures
in
the
same
redundant
drive
loop
pair,
make
the
changes
to
the
enclosure
IDs
in
the
next
maintenance
schedule.
This
will
prevent
unnecessary
downtime
when
you
add
enclosures
of
different
type
(especially
EXP810s)
to
the
existing
enclosures
in
the
redundant
drive
loop
pair.
v
When
mixing
EXP810
and
EXP710
enclosures
in
the
same
drive
loop
with
EXP100
enclosures,
all
of
the
EXP810s
and
EXP710s
must
be
grouped
together
with
the
EXP100
connected
to
either
end
of
the
EXP810/EXP710
drive
expansion
enclosure
group.
The
primary
reason
for
this
grouping
is
because
the
controller
firmware
considers
the
EXP810s
and
EXP710s
to
be
the
same
enclosure
type
(switched
disk
expansion
unit
type
which
have
an
ESM-embedded
fibre
channel
loop
switch)
despite
being
different
models.
These
two
enclosure
models
must
be
grouped
together
if
they
are
contained
within
a
drive
loop.
Note:
When
grouping
the
EXP810s
and
EXP710s
together,
you
must
cable
all
of
the
EXP810s
together,
followed
by
all
of
the
EXP710s
or
vice
versa.
Do
not
randomly
cable
the
EXP710s
and
EXP810s
together
in
the
drive
loop.
Figure
37
on
page
54
and
Figure
38
on
page
55
are
examples
of
correctly
cabling
the
intermix
of
EXP100
with
EXP810
and
EXP710
enclosures.
Figure
39
on
page
56
and
Figure
40
on
page
57
are
examples
of
incorrectly
cabling
the
52
IBM
TotalStorage
DS4300
Fibre
Channel
Storage
Subsystem:
Installation,
User’s,
and
Maintenance
Guide
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Summary of Contents for TotalStorage DS4300 Turbo
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Page 220: ...Part Number 42D3300 Printed in USA GC26 7722 02 1P P N 42D3300...
