parameter
when
the
kernel
compiles.
Traditionally,
this
value
has
been
40,
but
newer
Red
Hat
kernels
have
it
set
to
128
or
256.
On
SUSE
SLES
9
the
dynamic
configuration
system
eliminates
this
limit.
For
example,
consider
a
system
with
an
internal
SCSI
Adaptec
host
adapter
and
one
disk.
The
system
contains
fibre-connected
disks
and
a
CONFIG_SD_EXTRA_DEVS
parameter
set
to
40.
The
Adaptec
host
adapter
driver
loads
first
and
configures
the
single
attached
disk.
At
this
point,
the
system
is
limited
to
a
total
of
41
SCSI
disks
instead
of
the
full
128
or
256.
If
there
are
more
than
40
disks
visible
in
the
fibre-channel
fabric,
the
system
configures
and
uses
only
the
first
40.
All
of
the
fabric
devices
might
be
listed
in
the
/proc/scsi/scsi
directory,
but
only
the
first
40
are
configured
with
the
SCSI
disk
driver.
You
are
more
likely
to
encounter
this
constraint
in
multipath
fabric
situations.
Configuring
the
storage
unit
This
section
provides
instructions
for
configuring
the
storage
unit.
Configuring
the
storage
unit
for
an
Intel
host
running
Linux
Configuring
the
storage
unit
for
an
Intel
host
running
Linux
Each
of
the
attached
storage
unit
LUNs
has
a
special
device
file
in
the
Linux
directory
/dev.
There
are
maximums
of
128
or
256
fibre-channel
disks
that
are
based
on
the
major
numbers
that
are
available.
For
Red
Hat,
the
operating
system
automatically
adds
the
entries
for
all
128
devices.
For
SUSE,
there
are
only
special
device
files
for
the
first
16
disks.
You
must
create
the
device
files
for
additional
disks
by
using
the
mknod
command.
The
range
of
devices
goes
from
/dev/sda
(LUN
0)
to
/dev/sddx
(LUN
127).
Figure
54
shows
an
example
of
the
range
for
the
devices.
Partitioning
storage
unit
disks
for
an
Intel
host
running
Linux
Partitioning
storage
unit
disks
for
an
Intel
host
running
Linux
Before
you
create
a
file
system,
partition
the
disk
by
using
the
fdisk
utility.
You
have
to
specify
the
special
device
file
of
the
disk
you
want
to
partition
when
executing
fdisk.
Figure
55
on
page
110
shows
an
example
of
the
different
options
for
the
fdisk
utility.
#
ls
–l
/dev/sda
brw-rw----
1
root
disk
8,
0
Aug
24
2000
/dev/sda
Figure
54.
Example
of
range
of
devices
for
a
Linux
host
Chapter
11.
Attaching
to
an
Intel
host
running
Linux
109
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