Migrating
data
to
a
DS8000
storage
unit
using
volume
management
methods
The
UNIX
volume
manager
method
for
migrating
data
is
very
similar
to
the
method
that
is
used
by
AIX
systems.
It
involves
the
use
of
commands
or
a
combination
of
commands
that
copy
and
move
the
data.
The
following
methods
are
available
for
the
UNIX
volume
manager.
The
method
you
choose
depends
on
your
operating
environment.
The
cplv
method
Use
the
cplv
command
to
make
entire
copies
of
logical
volumes.
You
can
issue
the
cplv
command
without
disrupting
access
to
data
that
is
contained
within
the
logical
volume
that
it
is
copying.
However,
there
is
one
drawback
to
using
this
command.
Active
logical
volumes
might
not
be
copied
when
you
use
this
command.
You
must
ensure
that
your
logical
volumes
are
closed
before
you
run
this
command.
To
ensure
consistency
and
limit
the
problems
that
are
associated
with
this
command,
proceed
with
the
following
process:
1.
Close
your
logical
volumes
either
by
unmounting
the
file
system
where
they
are
built
on,
or
by
shutting
down
any
database
that
has
an
open
raw
logical
volume.
2.
Run
the
cplv
command.
3.
Update
the
system
configuration
file,
/etc/filesystems,
to
include
the
relevant
configuration
data
on
the
new
logical
volume
and
file
system.
4.
Issue
the
fsck
command
to
run
the
file
system
integrity
checker
to
ensure
data
consistency
within
the
new
logical
volumes.
The
migratepv
method
This
is
an
ideal
method
for
moving
data
without
disrupting
users.
Use
the
migratepv
command
to
create
a
mirror
of
each
logical
volume
that
is
contained
within
the
physical
volume.
Issuing
this
command
also
synchronizes
both
copies.
The
benefit
of
this
command
is
that
you
can
run
it
on
an
active
system.
You
might
notice
some
performance
degradation
due
to
the
automatic
nature
of
the
creation
and
the
synchronization
of
the
copy.
This
process
writes
each
physical
partition
and
locks
it
from
access
by
any
other
process.
This
can
slow
down
access
to
the
data,
but
it
ensures
data
integrity.
The
mklvcopy,
splitlvcopy
method
This
method
is
ideal
for
creating
a
copy
of
logical
volumes.
Use
the
mklvcopy
command
to
ensure
data
integrity
by
creating
a
mirror
copy
of
the
data
and
synchronizing
it
automatically.
Do
not
run
the
splitlvcopy
command
or
the
cplv
command
on
an
active
logical
volume.
If
processes
are
updating
the
data
while
the
split
is
taking
place,
the
consistency
of
the
data
on
both
copies
cannot
be
guaranteed.
After
you
run
the
splitlvcopy
command,
update
the
system
configuration
files.
Include
the
relevant
configuration
data
regarding
the
new
logical
volume
and
file
system.
Then
issue
the
fsck
to
run
the
file
system
integrity
checker
to
ensure
data
consistency
within
the
new
logical
volume.
The
mklvcopy,
rmlvcopy
method
This
method
is
ideal
for
migrating
active
logical
volumes
when
a
slight
performance
loss
is
acceptable.
This
method
creates
and
removes
mirrors
automatically,
ensuring
data
integrity.
150
DS8000
User’s
Guide
Summary of Contents for DS8000 - ADDITIONAL INFORMATION
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