Chapter
3.
Operational
Characteristics
This
chapter
describes
the
operational
characteristics
of
the
3494
Tape
Library.
3490E,
3590,
and
3592
Tape
Subsystem
Operation
The
3494
Tape
Library
controls
the
loading,
unloading,
and
associated
operations
of
its
tape
subsystems.
No
operator
attendance
is
required
unless
the
3494
Tape
Library
cannot
recover
from
a
subsystem
problem.
In
addition
to
existing
tape
subsystem
error
recovery,
the
control
unit
and
the
Library
Manager
execute
additional
recovery
procedures
when
the
tape
drive
detects
a
load,
unload,
or
tension
loss
failure.
TS7700
Virtualization
Engine
Components
The
TS7700
Virtualization
Engine
consists
of
several
primary
components
that
can
be
described
in
terms
of
their
system
role
or
according
to
their
technical
functions.
See
the
IBM
Virtualization
Engine
TS7700
Information
Center
at
publib.boulder.ibm.com/infocenter/ts7700ic/v1r0/index.jsp
for
complete
details
about
using
the
TS7700
Virtualization
Engine.
Nodes,
Clusters,
and
Grid
The
TS7700
Virtualization
Engine
is
built
on
a
distributed
node
architecture.
The
nodes
perform
either
virtualization
(vNode)
or
hierarchical
data
storage
management
(hNode).
The
vNode
presents
the
image
of
a
virtual
library(ies)
and
virtual
drives
to
a
host
system.
It
receives
tape
drive
and
library
requests
from
the
host
and
processes
them
as
real
devices
would.
It
also
translates
the
tape
requests
through
a
virtual
drive
and
uses
a
file
in
a
file
system
to
represent
the
virtual
tape
image.
After
a
logical
volume
has
been
created
or
altered
by
the
host
system
through
a
vNode
it
resides
in
disk
cache
or
on
physical
tape,
where
it
is
managed
by
the
hNode.
The
hNode
is
the
only
node
that
is
aware
of
physical
tape
resources
and
the
relationships
between
the
logical
volumes
and
physical
volumes.
It
is
also
responsible
for
any
replication
of
the
logical
volumes
and
their
attributes
across
site
boundaries.
Based
on
the
node
architecture,
a
vNode
or
hNode
can
run
on
separate
virtualization
hardware
or
be
combined
to
run
on
the
same
virtualization
hardware.
When
a
vNode
and
hNode
are
combined
to
run
on
the
same
virtualization
hardware,
they
are
referred
to
collectively
as
a
General
Node,
or
gNode.
The
TS7700
Virtualization
Engine
runs
a
gNode.
See
for
an
illustration
of
the
relationship
between
nodes.
©
Copyright
IBM
Corp.
2001,
2008
59
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