IBM 84892MU Installation Guide - Page 112

contingency

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consistency group A group of copy relationships between virtual disks that are managed as a single entity. consistent copy In a Metro or Global Mirror relationship, a copy of a secondary virtual disk (VDisk) that is identical to the primary VDisk from the viewpoint of a host system, even if a power failure occurred while I/O activity was in progress. consistent-stopped In a Global Mirror relationship, the state that occurs when the secondary virtual disk (VDisk) contains a consistent image, but the image might be out-of-date with respect to the primary VDisk. This state can happen when a relationship was in the consistent-synchronized state when an error occurred that forced a freeze of the consistency group. This state can also happen when a relationship is created with the create-consistent flag set to TRUE. consistent-synchronized In a Global Mirror relationship, the status condition that occurs when the primary virtual disk (VDisk) is accessible for read and write I/O operations. The secondary VDisk is accessible for read-only I/O operations. See also primary virtual disk and secondary virtual disk. container A data storage location; for example, a file, directory, or device. A software object that holds or organizes other software objects or entities. contingency capacity Initially, a fixed amount of unused real capacity that is maintained on a space-efficient virtual disk that is configured to automatically expand its real capacity. It is also the difference between the used capacity and the new real capacity when the real capacity is changed manually. copied In a FlashCopy mapping, a state that indicates that a copy has been started after the copy relationship was created. The copy process is complete and the target disk has no further dependence on the source disk. copying A status condition that describes the state of a pair of virtual disks (VDisks) that have a copy relationship. The copy process has been started but the two virtual disks are not yet synchronized. Copy Services The services that enable you to copy virtual disks (VDisks): FlashCopy, Metro, and Global Mirror. counterpart SAN A nonredundant portion of a redundant storage area network (SAN). A counterpart SAN provides all the connectivity of the redundant SAN but without the redundancy. Each counterpart SANs provides an alternate path for each SAN-attached device. See also redundant SAN. cross-volume consistency In SAN Volume Controller, a consistency group property that guarantees consistency between virtual disks when an application issues dependent write operations that span multiple virtual disks. 72

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consistency
group
A
group
of
copy
relationships
between
virtual
disks
that
are
managed
as
a
single
entity.
consistent
copy
In
a
Metro
or
Global
Mirror
relationship,
a
copy
of
a
secondary
virtual
disk
(VDisk)
that
is
identical
to
the
primary
VDisk
from
the
viewpoint
of
a
host
system,
even
if
a
power
failure
occurred
while
I/O
activity
was
in
progress.
consistent-stopped
In
a
Global
Mirror
relationship,
the
state
that
occurs
when
the
secondary
virtual
disk
(VDisk)
contains
a
consistent
image,
but
the
image
might
be
out-of-date
with
respect
to
the
primary
VDisk.
This
state
can
happen
when
a
relationship
was
in
the
consistent-synchronized
state
when
an
error
occurred
that
forced
a
freeze
of
the
consistency
group.
This
state
can
also
happen
when
a
relationship
is
created
with
the
create-consistent
flag
set
to
TRUE
.
consistent-synchronized
In
a
Global
Mirror
relationship,
the
status
condition
that
occurs
when
the
primary
virtual
disk
(VDisk)
is
accessible
for
read
and
write
I/O
operations.
The
secondary
VDisk
is
accessible
for
read-only
I/O
operations.
See
also
primary
virtual
disk
and
secondary
virtual
disk
.
container
A
data
storage
location;
for
example,
a
file,
directory,
or
device.
A
software
object
that
holds
or
organizes
other
software
objects
or
entities.
contingency
capacity
Initially,
a
fixed
amount
of
unused
real
capacity
that
is
maintained
on
a
space-efficient
virtual
disk
that
is
configured
to
automatically
expand
its
real
capacity.
It
is
also
the
difference
between
the
used
capacity
and
the
new
real
capacity
when
the
real
capacity
is
changed
manually.
copied
In
a
FlashCopy
mapping,
a
state
that
indicates
that
a
copy
has
been
started
after
the
copy
relationship
was
created.
The
copy
process
is
complete
and
the
target
disk
has
no
further
dependence
on
the
source
disk.
copying
A
status
condition
that
describes
the
state
of
a
pair
of
virtual
disks
(VDisks)
that
have
a
copy
relationship.
The
copy
process
has
been
started
but
the
two
virtual
disks
are
not
yet
synchronized.
Copy
Services
The
services
that
enable
you
to
copy
virtual
disks
(VDisks):
FlashCopy,
Metro,
and
Global
Mirror.
counterpart
SAN
A
nonredundant
portion
of
a
redundant
storage
area
network
(SAN).
A
counterpart
SAN
provides
all
the
connectivity
of
the
redundant
SAN
but
without
the
redundancy.
Each
counterpart
SANs
provides
an
alternate
path
for
each
SAN-attached
device.
See
also
redundant
SAN
.
cross-volume
consistency
In
SAN
Volume
Controller,
a
consistency
group
property
that
guarantees
consistency
between
virtual
disks
when
an
application
issues
dependent
write
operations
that
span
multiple
virtual
disks.
72