Chapter
2.
ESM
configuration
switches
This
chapter
provides
general
information
about
ESM
functionality
as
it
relates
to
ESM
configuration
switch
settings.
The
ESM
configuration
switches
control
how
power
is
supplied
to
the
expansion
unit
and
what
expansion
unit
services
are
enabled
(for
example,
switching
between
a
rack
configuration
and
a
tower
configuration
or
switching
between
a
single
bus
and
a
dual-bus
configuration.)
In
a
dual-bus
configuration,
each
bus
uses
seven
drives.
A
single-bus
configuration
uses
all
14
drives.
An
ESM
contains
five
sets
of
configuration
switches,
shown
in
the
following
illustration.
Box-ID switch
(SW2)
SW1
SW5
SW3
SW4
Note:
If
both
ESMs
are
installed,
the
ESM
on
the
left
must
have
valid
switch
settings.
The
switch
settings
on
the
ESM
that
is
installed
in
the
right
bay
are
ignored.
If
only
one
ESM
is
installed,
it
must
be
in
the
left
bay.
Configuration
switches
are
summarized
in
Table
2
and
described
in
this
section.
Table
2.
Factory
default
configuration
switch
settings
Switch
location
Position
Description
Factory
default
switch
setting
Configuration
switch
SW1
1
Reserved
Off
2
Reserved
On
3
Reserved
On
4
Reserved
Off
©
Copyright
IBM
Corp.
2002
15
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