preparing
In
a
Global
Mirror
relationship,
the
state
that
occurs
when
any
changed
write
data
for
the
source
virtual
disk
(VDisk)
is
flushed
from
the
cache.
Any
read
or
write
data
for
the
target
VDisk
is
discarded
from
the
cache.
primary
virtual
disk
In
a
Metro
or
Global
Mirror
relationship,
the
target
of
write
operations
issued
by
the
host
application.
property
In
the
Common
Information
Model
(CIM),
an
attribute
that
is
used
to
characterize
instances
of
a
class.
PuTTY
A
client
program
that
allows
you
to
run
remote
sessions
on
your
computer
through
specific
network
protocols,
such
as
SSH,
Telnet,
and
Rlogin.
Q
qualifier
A
value
that
provides
additional
information
about
a
class,
association,
indication,
method,
method
parameter,
instance,
property,
or
reference.
quorum
A
set
of
nodes
that
operates
as
a
cluster.
Each
node
has
a
connection
to
every
other
node
in
the
cluster.
If
a
connection
failure
causes
the
cluster
to
split
into
two
or
more
groups
of
nodes
that
have
full
connection
within
the
group,
the
quorum
is
the
group
that
is
selected
to
operate
as
the
cluster.
Typically,
this
is
the
larger
group
of
nodes,
but
the
quorum
disk
serves
as
a
tiebreaker
if
the
groups
are
the
same
size.
queue
depth
The
number
of
I/O
operations
that
can
be
run
in
parallel
on
a
device.
quorum
disk
A
managed
disk
(MDisk)
that
contains
a
reserved
area
that
is
used
exclusively
for
cluster
management.
The
quorum
disk
is
accessed
in
the
event
that
it
is
necessary
to
determine
which
half
of
the
cluster
continues
to
read
and
write
data.
quorum
index
The
pointer
that
indicates
the
order
used
to
resolve
a
tie.
Nodes
attempt
to
lock
the
first
quorum
disk
(index
0),
followed
by
the
next
disk
(index
1),
and
finally
the
last
disk
(index
2).
The
tie
is
broken
by
the
node
that
locks
them
first.
R
rack
A
free-standing
framework
that
holds
the
devices
and
card
enclosure.
RAID
See
redundant
array
of
independent
disks
.
RAID
0
IBM
definition:
RAID
0
allows
a
number
of
disk
drives
to
be
combined
and
presented
as
one
large
disk.
RAID
0
does
not
provide
any
data
redundancy.
If
one
drive
fails,
all
data
is
lost.
HP
definition:
A
RAID
storageset
that
stripes
data
across
an
array
of
disk
drives.
A
single
logical
disk
spans
multiple
physical
disks,
allowing
parallel
data
processing
for
increased
I/O
performance.
While
the
Glossary
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