ESCON
High
Performance
Option
feature
or
the
Extended
High
Performance
Option
feature.
Therefore,
the
graphs
do
not
represent
actual
host
data
bytes
but
the
compressed
volume
sizes
as
stored
in
the
tape
volume
cache.
A
separate
graph
is
available
for
each
VTS
in
the
3494
Tape
Library.
Data
is
displayed
for
the
previous
29
days
as
of
midnight
and
for
the
current
day
on
an
hourly
snapshot.
Active
Data
is
the
total
size,
as
stored
in
the
tape
volume
cache,
of
all
active
logical
volumes
that
have
been
copied
to
stacked
volumes.
Virtual
volumes
that
exist
in
the
tape
volume
cache
but
have
not
been
copied
to
tape
are
not
included.
The
graph
includes
invalidated
copies
of
logical
volumes
(duplicate
volumes
that
the
reconciliation
process
did
not
delete
from
the
active
volume
list).
Maximum
Active
Data
is
the
total
capacity
of
all
stacked
volumes
that
have
been
inserted
in
the
VTS.
For
the
3494
B16
VTS,
the
Maximum
Active
Data
is
a
theoretical
value
computed
by
assuming
that
stacked
volumes
are
filled
with
data
compressed
at
a
2:1
ratio.
The
3494
B18,
B10,
and
B20
VTSs
use
the
actual
compression
ratio
for
all
data
copied
from
the
tape
volume
cache
to
full
stacked
volumes
to
calculate
the
Maximum
Active
Data.
Because
data
received
from
enhanced
ESCON
host
attachments
was
compressed
previously
into
the
tape
volume
cache,
no
further
compression
to
the
stacked
volume
from
the
tape
volume
cache
occurs
for
the
3494
B18,
B10,
and
B20
VTSs.
Note
that
invalidated
copies
of
logical
volumes
reduce
the
amount
of
active
data
you
can
store
on
the
stacked
volumes.
Free
Storage
is
the
total
capacity
of
all
empty
stacked
volumes
in
the
3494
Tape
Library
calculated
by
using
a
compression
ratio
as
described
previously
for
Maximum
Active
Data.
This
calculation
does
not
include
partially
filled
stacked
Figure
99.
VTS
Active
Data
Window
Chapter
6.
Advanced
Operating
Procedures
173
Содержание TotalStorage 3494 Tape Library
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