Glossary
This
glossary
includes
terms
for
the
IBM
TotalStorage
SAN
Volume
Controller.
This
glossary
includes
selected
terms
and
definitions
from
A
Dictionary
of
Storage
Networking
Terminology
(http://www.snia.org/education/dictionary),
copyrighted
2001
by
the
Storage
Networking
Industry
Association,
2570
West
El
Camino
Real,
Suite
304,
Mountain
View,
California
94040-1313.
Definitions
derived
from
this
book
have
the
symbol
(S)
after
the
definition.
The
following
cross-references
are
used
in
this
glossary:
See
Refers
the
reader
to
one
of
two
kinds
of
related
information:
v
A
term
that
is
the
expanded
form
of
an
abbreviation
or
acronym.
This
expanded
form
of
the
term
contains
the
full
definition.
v
A
synonym
or
more
preferred
term.
See
also
Refers
the
reader
to
one
or
more
related
terms.
Contrast
with
Refers
the
reader
to
a
term
that
has
an
opposite
or
substantively
different
meaning.
A
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
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.
cluster.
In
SAN
Volume
Controller,
a
pair
of
nodes
that
provides
a
single
configuration
and
service
interface.
CIM.
See
Common
Information
Model
.
Common
Information
Model
(CIM).
A
set
of
standards
developed
by
the
Distributed
Management
Task
Force
(DMTF).
CIM
provides
a
conceptual
framework
for
storage
management
and
an
open
approach
to
the
design
and
implementation
of
storage
systems,
applications,
databases,
networks,
and
devices.
D
degraded.
Pertaining
to
a
valid
configuration
that
has
suffered
a
failure
but
continues
to
be
supported
and
legal.
Typically,
a
repair
action
can
be
performed
on
a
degraded
configuration
to
restore
it
to
a
valid
configuration.
directed
maintenance
procedures.
The
set
of
maintenance
procedures
that
can
be
run
for
a
cluster.
These
procedures
are
documented
in
the
service
guide.
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.
E
error
code.
A
value
that
identifies
an
error
condition.
excluded.
In
SAN
Volume
Controller,
the
status
of
a
managed
disk
that
the
cluster
has
removed
from
use
after
repeated
access
errors.
extent.
A
unit
of
data
that
manages
the
mapping
of
data
between
managed
disks
and
virtual
disks.
F
failover.
In
SAN
Volume
Controller,
the
function
that
occurs
when
one
redundant
part
of
the
system
takes
over
the
workload
of
another
part
of
the
system
that
has
failed.
fibre
channel.
A
technology
for
transmitting
data
between
computer
devices
at
a
data
rate
of
up
to
4
Gbps.
It
is
especially
suited
for
attaching
computer
servers
to
shared
storage
devices
and
for
interconnecting
storage
controllers
and
drives.
FC.
See
fibre
channel
.
©
Copyright
IBM
Corp.
2003,
2004
59
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