the
next
available
volume
assigned
to
the
specified
category
to
satisfy
the
host
request.
Within
a
VTS,
the
data
fragment
is
used
in
conjunction
with
a
mount
from
category
request
to
provide
very
fast
response
times
for
nonspecific
mounts.
Categories
used
for
nonspecific
mounts
are
defined
through
the
Library
Manager
as
“Fast
Ready”
categories
(see
When
a
mount
request
specifies
a
category
defined
as
“Fast
Ready”,
the
mount
is
satisfied
by
accessing
the
data
fragment
in
the
tape
volume
cache
associated
with
the
virtual
volume
selected
by
the
Library
Manager
to
satisfy
the
request.
No
recall
of
the
data
from
the
previous
usage
of
the
volume
is
performed
because
the
fragment
contains
the
label
information
needed
by
the
host
tape
management
software
to
validate
the
use
of
the
volume
for
a
nonspecific
mount
request.
The
subsystem
signals
the
host
that
the
mount
is
complete
when
the
fragment
is
accessed.
The
result
is
a
very
short
mount
response
time
because
no
physical
movement
or
mounting
of
a
cartridge
is
involved.
If
a
mount
request
specifies
a
category
that
has
not
been
defined
as
“Fast
Ready”,
the
3494
Tape
Library
has
no
indication
that
the
application
intends
to
write
from
the
beginning
of
the
volume.
It
is
likely
that
the
selected
virtual
volume
is
not
resident
in
the
tape
volume
cache
and
must
be
recalled
from
physical
tape.
Deletion
of
VTS
Logical
Volumes
Logical
volumes
in
a
VTS
can
be
deleted
only
under
the
control
of
the
attached
hosts.
A
logical
volume
can
be
deleted
only
if
it
is
in
the
Insert
category
or
a
category
with
a
Fast
Ready
attribute
set
(see
When
a
logical
volume
is
deleted,
it
is
removed
from
the
3494
Tape
Library’s
inventory,
and
any
data
that
was
associated
with
the
volume
is
deleted.
A
logical
volume
that
is
in
a
Fast
Ready
category
is
deleted
from
a
VTS
by
performing
the
following
steps.
(A
logical
volume
that
is
in
the
Insert
category
is
deleted
from
a
VTS
by
performing
step
2
only).
1.
Assigning
the
logical
volume
to
a
category
within
the
3494
Tape
Library
that
has
the
Fast
Ready
attribute
assigned.
This
is
accomplished
by
the
tape
management
system
when
the
data
associated
with
the
volume
reaches
its
expiration
date
and
the
volume
is
returned
to
the
scratch
pool.
2.
Assigning
the
logical
volume
to
an
eject
category.
This
can
be
done
by
asking
that
the
volume
be
ejected
from
the
3494
Tape
Library,
using
platform-specific
control
interfaces;
for
example,
with
MVS/ESA,
OS/390,
or
z/OS,
through
the
tape
management
interfaces,
ISMF
panels,
or
MVS,
OS/390,
or
z/OS
operator
commands.
Note:
When
a
logical
volume
has
been
deleted
from
the
3494
Tape
Library,
data
on
the
volume
is
deleted
and
cannot
be
recovered.
Deletion
of
Expired
VTS
Logical
Volume
Data
Logical
volumes
in
a
VTS
are
stored
on
physical
stacked
volumes
after
the
host
closes
the
logical
volume.
After
a
period
of
time,
data
on
a
logical
volume
that
is
not
intended
for
long
term
archive
is
eventually
expired
through
the
host
tape
management
system,
and
the
logical
volume
is
placed
in
scratch
status.
Returning
a
logical
volume
to
scratch
does
not
change
the
status
of
the
data
associated
with
the
volume
from
the
VTS’s
point
of
view.
The
data
on
the
physical
stacked
volume
is
considered
valid
from
the
VTS’s
point
of
view
until
the
logical
volume
is
rewritten
or
otherwise
modified.
This
causes
the
VTS
to
continue
managing
the
data
as
if
it
was
still
active,
even
though
the
user
has
actually
scratched
it.
The
benefit
of
having
the
VTS
consider
the
expired
data
as
valid
is
that
if
a
mistake
was
made
in
returning
a
volume
to
scratch
status,
simply
returning
the
volume
to
74
3494
Tape
Library
Operator
Guide
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