dense
wavelength
division
multiplexing
(DWDM)
A
technology
that
places
many
optical
signals
onto
one
single-mode
fiber
using
slightly
different
optical
frequencies.
DWDM
enables
many
data
streams
to
be
transferred
in
parallel.
dependent
write
operations
A
set
of
write
operations
that
must
be
applied
in
the
correct
order
to
maintain
cross-volume
consistency.
destage
A
write
command
initiated
by
the
cache
to
flush
data
to
disk
storage.
device
In
the
CIM
Agent,
the
storage
server
that
processes
and
hosts
client
application
requests.
IBM
definition:
A
piece
of
equipment
that
is
used
with
the
computer
and
does
not
generally
interact
directly
with
the
system,
but
is
controlled
by
a
controller.
HP
definition:
In
its
physical
form,
a
magnetic
disk
that
can
be
attached
to
a
SCSI
bus.
The
term
is
also
used
to
indicate
a
physical
device
that
has
been
made
part
of
a
controller
configuration;
that
is,
a
physical
device
that
is
known
to
the
controller.
Units
(virtual
disks)
can
be
created
from
devices
after
the
devices
have
been
made
known
to
the
controller.
device
provider
A
device-specific
handler
that
serves
as
a
plug-in
for
the
Common
Information
Model
(CIM);
that
is,
the
CIM
object
manager
(CIMOM)
uses
the
handler
to
interface
with
the
device.
directed
maintenance
procedures
The
set
of
maintenance
procedures
that
can
be
run
for
a
cluster.
These
procedures
are
run
from
within
the
SAN
Volume
Controller
application
and
are
documented
in
the
IBM
System
Storage
SAN
Volume
Controller:
Service
Guide
.
disconnected
In
a
Metro
or
Global
Mirror
relationship,
pertains
to
two
clusters
when
they
cannot
communicate.
discovery
The
automatic
detection
of
a
network
topology
change,
for
example,
new
and
deleted
nodes
or
links.
disk
controller
A
device
that
coordinates
and
controls
the
operation
of
one
or
more
disk
drives
and
synchronizes
the
operation
of
the
drives
with
the
operation
of
the
system
as
a
whole.
Disk
controllers
provide
the
storage
that
the
cluster
detects
as
managed
disks
(MDisks).
disk
drive
A
disk-based,
nonvolatile,
storage
medium.
disk
zone
A
zone
defined
in
the
storage
area
network
(SAN)
fabric
in
which
the
SAN
Volume
Controller
can
detect
and
address
the
logical
units
that
the
disk
controllers
present.
Distributed
Management
Task
Force
(DMTF)
An
organization
that
defines
standards
for
the
management
of
distributed
systems.
See
also
Common
Information
Model
.
DMP
See
directed
maintenance
procedures
.
Glossary
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