IBM
TotalStorage
Multipath
Subsystem
Device
Driver
(SDD)
Software
that
is
designed
to
support
the
multipath
configuration
environments
of
the
DS6000.
The
SDD
resides
in
a
host
system
with
the
native
disk
device
driver.
IBM
TotalStorage
Resiliency
Family
A
set
of
hardware
and
software
features
and
products,
as
well
as
integrated
software
and
services
that
are
available
on
theIBM
TotalStorage
DS6000
and
the
IBM
TotalStorage
Enterprise
Storage
Server,
Models
750
and
800.
IML
See
initial
microcode
load
.
implicit
allegiance
In
Enterprise
Systems
Architecture/390,
a
relationship
that
a
control
unit
creates
between
a
device
and
a
channel
path
when
the
device
accepts
a
read
or
write
operation.
The
control
unit
guarantees
access
to
the
channel
program
over
the
set
of
channel
paths
that
it
associates
with
the
allegiance.
initial
microcode
load
(IML)
The
action
of
loading
microcode
for
a
computer
into
that
computer’s
storage.
initial
program
load
(IPL)
The
action
of
loading
software
into
a
computer,
typically
an
operating
system
that
controls
the
computer.
initiator
A
SCSI
device
that
communicates
with
and
controls
one
or
more
targets.
Contrast
with
target
.
i-node
The
internal
structure
in
an
AIX
operating
system
that
describes
the
individual
files
in
the
operating
system.
It
contains
the
code,
type,
location,
and
owner
of
a
file.
input/output
(I/O)
Pertaining
to
(a)
input,
output,
or
both
or
(b)
a
device,
process,
or
channel
involved
in
data
input,
data
output,
or
both.
input/output
configuration
data
set
A
configuration
definition
built
by
the
I/O
configuration
program
(IOCP)
and
stored
on
disk
files
associated
with
the
processor
controller.
interleave
To
automatically
create
two
striped
partitions
across
the
drives
in
a
RAID-5
array,
both
of
which
use
the
count-key-data
(CKD)
record
format.
Internet
Protocol
(IP)
In
the
Internet
suite
of
protocols,
a
protocol
without
connections
that
routes
data
through
a
network
or
interconnecting
networks
and
acts
as
an
intermediary
between
the
higher
protocol
layers
and
the
physical
network.
The
upper
layer
supports
one
or
more
logical
protocols
(for
example,
a
SCSI-command
protocol
and
a
zSeries
command
protocol).
Refer
to
ANSI
X3.230-199
x
.
The
IP
acronym
is
the
IP
in
TCP/IP.
See
also
Transmission
Control
Protocol/Internet
Protocol
.
invalidate
To
remove
a
logical
data
unit
from
cache
memory
because
it
cannot
support
continued
access
to
the
logical
data
unit
on
the
device.
This
removal
might
be
the
result
of
a
failure
within
the
storage
server
or
a
storage
device
that
is
associated
with
the
device.
I/O
See
input/output
.
I/O
adapter
(IOA)
An
input-output
adapter
on
the
PCI
bus.
IOCDS
See
input/output
configuration
data
set
.
IOCP
See
I/O
Configuration
Program
.
I/O
Configuration
Program
(IOCP)
A
program
that
defines
to
a
system
all
the
available
I/O
devices
and
channel
paths.
I/O
device
An
addressable
read
and
write
unit,
such
as
a
disk
drive
device,
magnetic
tape
device,
or
printer.
I/O
interface
An
interface
that
enables
a
host
to
perform
read
and
write
operations
with
its
associated
peripheral
devices.
I/O
Priority
Queueing
A
facility
in
the
Workload
Manager
of
zSeries
that
enables
the
system
administrator
to
set
priorities
for
queueing
I/Os
from
different
system
images.
See
also
multiple
allegiance
and
parallel
access
volume
.
I/O
processor
(IOP)
Controls
input-output
adapters
and
other
devices.
82
Introduction
and
Planning
Guide
Summary of Contents for System storage DS6000 Series
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