storage
pool
of
4.
The
secondary
copy
of
LOG001
is
written
to
a
stacked
volume
that
is
in
pool
4.
Multiple
Management
Classes
can
define
the
same
secondary
pool.
The
Peer-to-Peer
Copy
Mode
is
used
in
the
PtP
environment
only.
For
non-PTP
environments
this
element
is
ignored.
It
controls
when
a
logical
volume
is
copied
to
the
second
PtP
library.
The
options
are
as
follows:
v
Immediate
Copy
Mode:
In
this
mode,
when
a
host
Rewind/Unload
command
is
received,
the
copy
operation
begins.
The
copy
operation
is
only
performed
by
the
VTC
that
received
the
Rewind/Unload
command.
When
the
copy
operation
completes,
the
VTC
indicates
that
the
Rewind/Unload
is
complete.
Since
the
copy
operation
is
executed
during
the
command
execution
of
the
Rewind/Unload
command,
the
job
times
for
writing
a
logical
volume
is
longer
when
compared
to
the
same
job
on
a
non-PtP
VTS.
v
Deferred
Copy
Mode:
In
this
mode,
when
a
host
Rewind/Unload
command
is
received
for
a
logical
volume,
a
copy
operation
is
queued
to
every
VTC
in
the
configuration.
Once
the
operation
is
on
at
least
one
VTC
copy
queue,
the
VTC
indicates
that
the
Rewind/Unload
is
complete.
The
copy
is
then
executed
in
the
background
as
VTS
activity
permits
by
the
first
VTC
that
also
has
available
resources
for
the
copy.
v
VTC
Defined:
Immediate
or
deferred
as
defined
at
the
VTC.
In
a
Geographically
Dispersed
Parallel
Sysplex
™
(GDPS
®
)
environment
the
VTC
Defined
mode
should
be
selected.
This
will
prevent
the
Management
Class
defined
copy
mode
from
overriding
the
host
or
VTC
defined
copy
mode.
Multiple
Management
Classes
can
define
the
same
Peer-to-Peer
Copy
Mode.
v
No
Copy:
Logical
volumes
are
not
copied
to
the
second
PtP
VTS
when
this
option
is
selected.
The
PtP
I/O
VTS
specification
has
three
settings.
v
VTC
Defined:
Selecting
this
option
directs
the
VTC
to
select
which
VTS
acts
as
the
I/O
VTS.
v
Dist.
Library
0:
Selecting
this
option
sets
Distribution
Library
0
(VTS
0)
as
the
I/O
VTS.
v
Dist.
Library
1:
Selecting
this
option
sets
Distribution
Library
1
(VTS
1)
as
the
I/O
VTS.
Note:
The
No
Copy
option
for
Peer-to-Peer
Copy
Mode
and
the
PtP
I/O
VTS
setting
together
comprise
the
PtP
Selective
Dual
Copy
feature.
This
feature
helps
minimize
wasted
bandwidth
and
storage
by
preventing
useless
information
(such
as
a
copy
of
production
data
used
for
testing
updated
applications
or
data
generated
during
a
disaster
recovery
test)
from
being
copied
to
the
non-I/O
VTS.
VE
Clusters
Used
to
enter
or
view
the
cluster
copy
data
consistency
point
values
for
each
cluster
of
the
IBM
Virtualization
Engine
TS7700
Series.
Clicking
on
the
Open
Panel
button
brings
up
the
Cluster
Copy
Data
Consistency
Point
panel
that
is
used
to
change
or
view
the
consistency
point
values
on
a
per-virtualization
engine
basis.
This
button
is
only
enabled
if
there
is
at
least
one
virtualization
engine
attached
to
this
Library
Manager
that
has
two
or
more
clusters.
See
Chapter
3.
Operational
Characteristics
71
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