association
A
class
that
contains
two
references
that
define
a
relationship
between
two
referenced
objects.
asymmetric
virtualization
A
virtualization
technique
in
which
the
virtualization
engine
is
outside
the
data
path
and
performs
a
metadata-style
service.
The
metadata
server
contains
all
the
mapping
and
locking
tables
while
the
storage
devices
contain
only
data.
See
also
symmetric
virtualization
.
auxiliary
virtual
disk
The
virtual
disk
that
contains
a
backup
copy
of
the
data
and
that
is
used
in
disaster
recovery
scenarios.
See
also
master
virtual
disk
.
availability
The
ability
of
a
system
to
continue
working,
with
perhaps
a
decrease
in
performance,
after
individual
components
fail.
B
bandwidth
The
range
of
frequencies
an
electronic
system
can
transmit
or
receive.
The
greater
the
bandwidth
of
a
system,
the
more
information
the
system
can
transfer
in
a
given
period
of
time.
bitmap
A
coded
representation
in
which
each
bit,
or
group
of
bits,
represents
or
corresponds
to
an
item;
for
example,
a
configuration
of
bits
in
main
storage
in
which
each
bit
indicates
whether
a
peripheral
device
or
a
storage
block
is
available
or
in
which
each
group
of
bits
corresponds
to
one
pixel
of
a
display
image.
blade
One
component
in
a
system
that
is
designed
to
accept
some
number
of
components
(blades).
Blades
could
be
individual
servers
that
plug
into
a
multiprocessing
system
or
individual
port
cards
that
add
connectivity
to
a
switch.
A
blade
is
typically
a
hot-swappable
hardware
device.
block
A
unit
of
data
storage
on
a
disk
drive.
block
virtualization
The
act
of
applying
virtualization
to
one
or
more
block-based
(storage)
services
for
the
purpose
of
providing
a
new
aggregated,
higher-level,
richer,
simpler,
or
secure
block
service
to
clients.
Block
virtualization
functions
can
be
nested.
A
disk
drive,
RAID
system,
or
volume
manager
all
perform
some
form
of
block-address
to
(different)
block-address
mapping
or
aggregation.
See
also
virtualization
.
Boolean
Pertaining
to
the
processes
used
in
the
algebra
formulated
by
George
Boole.
C
cache
A
high-speed
memory
or
storage
device
used
to
reduce
the
effective
time
required
to
read
data
from
or
write
data
to
lower-speed
memory
or
a
device.
Read
cache
holds
data
in
anticipation
that
it
will
be
requested
by
a
client.
Write
cache
holds
data
written
by
a
client
until
it
can
be
safely
stored
on
more
permanent
storage
media
such
as
disk
or
tape.
Call
Home
A
communication
service
that
links
a
machine
to
a
service
provider.
The
164
IBM
System
Storage
SAN
Volume
Controller:
Hardware
Installation
Guide
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