Storage
Management
of
the
Tape
Volume
Cache
Storage
management
software
manages
the
contents
of
the
tape
volume
cache.
Virtual
tape
volumes
are
copied
from
the
tape
volume
cache
to
physical
tape
when
the
virtual
volume
has
been
closed,
and
they
are
recalled
from
tape
to
the
tape
volume
cache
when
they
are
again
requested
to
be
mounted.
The
storage
management
software
stacks
multiple
migrated
files
onto
a
tape,
thereby
using
the
full
physical
tape
storage
capacity.
DFSMS
policy
management
provides
users
with
the
ability
to
control
tape
volume
cache
preferences
for
the
retention
of
virtual
volumes.
VTS
Export
and
Import
Overview
The
following
sections
provide
an
overview
of
VTS
Export
and
Import
operations.
Export
and
Import
Operations
Note:
In
a
PtP
VTS
configuration,
the
Export
and
Import
functions
of
FC
4000,
Advanced
Function,
or
FC
4001-4004,
Advanced
Policy
Management,
will
be
disabled.
The
Export
and
Import
operations
provide
a
way
to
move
logical
volumes
out
of
a
VTS
to
physical
cartridges
called
Exported
Stacked
Volumes
and
to
return
them
to
the
same
VTS
or
move
them
to
another
VTS.
Lists
of
volumes
for
Export
or
Import
operations
are
provided
to
a
VTS
on
logical
volumes
called
the
Export
List
Volume
or
the
Import
List
Volume,
which
are
resident
in
the
VTS.
The
Status
File
on
the
Export
or
Import
List
Volume
provides
status
for
each
logical
volume
being
processed.
See
Appendix
B,
″
VTS
Export
and
Import
Advanced
Function,
″
for
information
about
preparing
the
Export
or
Import
List
Volume.
An
emergency
copy
of
a
logical
volume
may
be
made
by
the
VTS
Exported
Volume
Read
Utility
(provided
by
DITTO/ESA
for
MVS)
from
an
Exported
Stacked
Volume
using
a
native
3590
B1A,
E1A,
or
H1A
tape
drive
or
3592
E05
or
J1A
tape
drive
in
the
VTS.
The
J
-,
K
-,
JA
-,
or
JJ
-type
Exported
Stacked
Volume
must
not
be
inserted
into
a
3494
Tape
Library
having
a
VTS
with
a
volser
range
that
allows
the
cartridge
to
become
a
VTS
Stacked
Volume
and
be
rewritten.
Also,
adding
VTS
Stacked
Volumes
to
your
tape
management
system
inventory
can
help
prevent
inadvertent
use
of
an
Exported
Stacked
Volume.
Note:
Media
type
JB
is
not
supported
with
VTS.
Import
The
Import
operation
allows
logical
volumes
that
are
stored
on
physical
Exported
Stacked
Volumes
to
become
logical
volumes
within
a
VTS.
A
specific
volume
or
all
volumes
may
be
imported
from
Exported
Stacked
Volumes
that
have
been
entered
into
a
3494
Tape
Library
through
the
convenience
I/O
station
and
have
been
moved
to
the
Import
category
by
an
operator
at
the
Library
Manager
console.
Host
console
messages
provide
status
on
progress
and
completion
of
the
Import
operation.
Export
The
Export
operation
allows
data
on
logical
volumes
in
a
VTS
to
be
removed
from
the
VTS
onto
physical
Exported
Stacked
Volumes.
The
list
of
volumes
to
be
exported
and
a
destination
for
each
volume
is
provided
by
the
host
operator
or
tape
management
system.
Logical
volumes
with
the
same
destination
are
grouped
on
the
same
Exported
Stacked
Volume.
This
physical
volume
is
then
moved
into
a
category
that
allows
an
operator
at
the
Library
Manager
console
to
eject
the
68
3494
Tape
Library
Operator
Guide
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