relationship
In
Metro
or
Global
Mirror,
the
association
between
a
master
virtual
disk
(VDisk)
and
an
auxiliary
VDisk.
These
VDisks
also
have
the
attributes
of
a
primary
or
secondary
VDisk.
See
also
auxiliary
virtual
disk,
master
virtual
disk,
primary
virtual
disk,
and
secondary
virtual
disk.
reliability
The
ability
of
a
system
to
continue
to
return
data
even
if
a
component
fails.
remote
fabric
In
Global
Mirror,
the
storage
area
network
(SAN)
components
(switches
and
cables)
that
connect
the
components
(nodes,
hosts,
and
switches)
of
the
remote
cluster.
roles
Authorization
is
based
on
roles
that
map
to
the
administrator
and
service
roles
in
an
installation.
The
switch
translates
these
roles
into
SAN
Volume
Controller
administrator
and
service
user
IDs
when
a
connection
is
made
to
the
node
for
the
SAN
Volume
Controller.
S
SAN
See
storage
area
network
.
SAN
Volume
Controller
fibre-channel
port
fan
in
The
number
of
hosts
that
can
see
any
one
SAN
Volume
Controller
port.
SATA
See
Serial
Advanced
Technology
Attachment
.
schema
A
group
of
object
classes
defined
for
and
applicable
to
a
single
namespace.
Within
the
CIM
Agent,
the
supported
schemas
are
the
ones
that
are
loaded
through
the
managed
object
format
(MOF).
SCSI
See
Small
Computer
Systems
Interface
.
SCSI
back-end
layer
The
layer
in
a
Small
Computer
Systems
Interface
(SCSI)
network
that
performs
the
following
functions:
controls
access
to
individual
disk
controller
systems
that
are
managed
by
the
cluster;
receives
requests
from
the
virtualization
layer,
processes
them,
and
sends
them
to
managed
disks;
addresses
SCSI-3
commands
to
the
disk
controller
systems
on
the
storage
area
network
(SAN).
SCSI
front-end
layer
The
layer
in
a
Small
Computer
Systems
Interface
(SCSI)
network
that
receives
I/O
commands
sent
from
hosts
and
provides
the
SCSI-3
interface
to
hosts.
SCSI
logical
unit
numbers
(LUNs)
are
mapped
to
virtual
disks
(VDisks)
in
this
layer
as
well.
Thus,
the
layer
converts
SCSI
read
and
write
commands
that
are
addressed
to
LUNs
into
commands
that
are
addressed
to
specific
VDisks.
SDD
See
subsystem
device
driver
(SDD)
.
secondary
virtual
disk
In
Metro
or
Global
Mirror,
the
virtual
disk
(VDisk)
in
a
relationship
that
contains
a
copy
of
data
written
by
the
host
application
to
the
primary
VDisk.
Glossary
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