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A
3494
B10
VTS
with
its
four
ESCON
attachments
supports
up
to
256
logical
paths.
All
virtual
drives
are
addressable
through
any
attachment
interface.
The
3494
B20
VTS
can
be
configured
with
up
to
16
Extended
Performance
ESCON
Channel
attachments.
Each
ESCON
attachment
supports
64
logical
paths.
A
3494
B20
VTS
with
its
16
ESCON
attachments
supports
up
to
1024
logical
paths.
All
virtual
drives
are
addressable
through
any
attachment
interface.
FICON
Host
Attachment
The
FICON
channel
attachment
features
provides
attachment
for
3494
B10
and
B20
VTSs.
The
3494
B10
or
B20
VTS
attaches
to
native
FICON
channels
in
systems
such
as
the
IBM
9672
Enterprise
G5
or
G6
Servers
and
the
zSeries
®
800,
900,
or
990
servers.
Long
and
short
wave
attachments
are
provided
and
can
be
attached
directly
to
a
server
or
through
a
director.
FICON
attachment
is
provided
by
FC
3415,
Long
Wave
FICON
Channel,
and
FC
3416,
Short
Wave
FICON
Channel.
FICON
attachment
features
provide
increased
performance
for
VTS
configurations,
greater
simplicity
of
configuration,
and
increased
per
channel
bandwidth.
They
also
extend
the
allowable
server
to
VTS
attachment
distance
up
to
100
km.
If
your
level
of
microcode
is
greater
than
2.28.700,
your
VTSs
and
PtP
VTSs
can
be
attached
to
1
Gbps
or
2
Gbps
FICON
channels.
The
VTS
and
VTC
microcode
will
auto-negotiate
with
the
channel
and
select
the
correct
speed.
If
you
want
to
override
the
auto-negotiation
and
force
the
subsystem
to
run
at
1
Gbps
speed,
please
contact
an
IBM
service
representative.
An
example
of
when
this
would
be
required
is
if
you
are
using
a
2
Gbps
channel
with
a
cable
length
that
is
only
supported
for
1
Gbps.
SCSI
Host
Attachment
The
SCSI
Host
Attachment
feature
provides
attachment
to
RS/6000,
pSeries,
Hewlett-Packard,
Intel
®
,
Sun,
and
Windows
®
servers.
The
sharing
of
a
VTS
among
S/390
®
,
zSeries,
RS/6000,
pSeries,
Sun,
Hewlett-Packard,
and
Windows
servers
requires
assignment
of
virtual
drive
usagesimilar
to
stand
alone
tape
drives.
Because
only
one
host
system
at
a
time
can
use
a
drive,
the
drive
has
to
be
dedicated
to
that
host
during
processing.
For
a
detailed
discussion
on
tape
library
sharing
between
S/390
or
zSeries
and
SCSI
hosts,
including
considerations
about
drive
sharing,
volume
sharing,
and
related
software
implementation
steps,
see
the
Guide
to
Sharing
and
Partitioning
IBM
Tape
Library
Dataservers
.
The
SCSI
target
addresses
are
discussed
in
the
IBM
TotalStorage
3494
Tape
Library
Introduction
and
Planning
Guide
.
PtP
VTS
The
PtP
VTS
is
a
configuration
of
multiple
3494
B10
or
B20
VTSs
with
their
associated
tape
libraries
and
multiple
3494
AX0
VTCs
or
VTCs.
The
3494
AX0
VTCs
or
VTCs
are
installed
in
one,
two,
three,
or
four
3494
CX0
Frames
or
3494
CX1
Frames.
The
3494
CX0
Frame
or
3494
CX1
Frame
contains
no
other
equipment.
The
3494
B10
or
B20
VTSs,
the
3494
AX0
VTCs
or
VTCs,
and
their
interconnections
provide
a
single
PtP
VTS
that
the
host
system
treats
as
a
single
VTS.
The
PtP
VTS
configuration
provides
a
dual
copy
of
data
in
newly
created
or
updated
tape
volumes
automatically.
The
PtP
VTS
stores
a
copy
of
the
tape
volume
data
in
the
78
3494
Tape
Library
Operator
Guide
Summary of Contents for TotalStorage 3494 Tape Library
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