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Automatic
VTS
database
backup
The
VTS
controller
maintains
a
database
of
information
about
the
location
and
status
of
logical
volumes
on
the
stacked
volumes
it
manages.
When
a
stacked
volume
has
been
filled
with
logical
volumes,
a
backup
of
the
entire
database
is
placed
at
the
end
of
the
filled
stacked
volume.
The
database
contains
a
time
and
date
stamp
that
identifies
when
the
backup
was
performed.
Automatic
database
recovery
When
a
restore
of
the
database
is
required,
the
Library
Manager,
in
conjunction
with
the
VTS
controller,
performs
the
following
steps
when
a
service
representative
initiates
them:
1.
Each
available
stacked
volume
in
the
3494
Tape
Library
is
mounted
and
the
time
and
date
stamp
of
the
database
backup
is
read.
This
step
finds
the
most
current
database
for
the
stacked
volumes
in
the
3494
Tape
Library.
2.
The
stacked
volume
with
the
most
current
database
is
again
mounted,
and
the
database
in
the
VTS
controller
is
restored.
3.
The
VTS
then
provides
information
to
the
Library
Manager
to
rebuild
its
inventory
records
for
each
logical
volume
found
in
the
database.
When
the
recovery
process
has
completed,
the
operator
varies
the
3494
Tape
Library
online
at
the
recovery
site
host,
and
the
Library
Manager
inventory
of
logical
volumes
is
uploaded
to
the
host
to
synchronize
the
host
catalogs
(DFSMS
and
applicable
tape
management
systems).
At
the
completion
of
the
recovery
process,
the
VTS
and
the
Library
Manager
contain
database
and
inventory
records
and
status
information
for
the
logical
volumes
as
found
in
the
most
recent
database
backup
on
the
undamaged
stacked
volumes.
Depending
on
the
following
conditions,
some
data
and
logical
volumes
may
not
have
been
recovered:
v
The
stacked
volumes
containing
the
latest
database
backups
were
destroyed.
Any
changes
to
the
location
or
status
of
logical
volumes
since
the
last
found
database
backup
are
lost.
Some
logical
volume
records
may
be
lost.
It
is
possible,
however,
that
the
database
contains
the
location
of
the
previous
use
of
logical
volumes
and
that
data
is
accessible
to
the
host.
v
One
or
more
stacked
volumes
found
in
the
restored
database
were
destroyed
during
the
event.
Although
the
VTS
database
and
the
Library
Manager
inventory
have
a
record
of
the
logical
volumes
that
resided
on
the
missing
stacked
volumes,
the
data
is
lost.
v
A
virtual
volume
had
not
been
closed
at
the
time
of
the
event.
The
VTS
database
does
not
have
a
record
of
the
virtual
volume’s
location
on
a
stacked
volume,
and
the
data
is
lost.
v
Logical
volumes
were
written
to
a
stacked
volume
between
the
time
the
last
database
backup
was
made
and
the
event.
The
VTS
database
does
not
have
a
record
of
the
new
logical
volume
locations
on
the
stacked
volume,
and
the
data
is
lost.
It
is
possible,
however,
that
the
database
contains
the
location
of
the
previous
use
of
the
logical
volume,
and
that
data
is
accessible
to
the
host.
Chapter
8.
Problem
Determination
Procedures
509
Содержание TotalStorage 3494 Tape Library
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