In
the
second
example,
the
cplv
command
copies
data
from
existing
logical
volume
oldlv
to
existing
logical
volume
existinglv
(-e)
.
When
you
use
the
-e
option,
it
overwrites
the
existing
target-logical
volume
with
the
data
from
the
source-logical
volume.
When
you
use
the
-e
option,
it
maintains
the
characteristics
of
the
existing
target-logical
volume.
Take
care
when
you
use
this
option.
The
cplv
command
is
a
good
method
for
copying
or
migrating
a
single
logical
volume.
Sometimes,
however,
you
might
need
to
migrate
all
the
data
from
a
physical
volume.
Using
mirroring
to
migrate
data
Use
the
following
information
as
guide
for
how
to
use
the
mirroring
function
of
logical
volume
manager
(LVM)
to
migrate
data.
Mirroring
can
only
be
used
on
logical
volumes.
It
cannot
be
used
for
physical
volumes.
Mirroring
is
an
LVM
task
that
you
perform
only
on
logical
volumes
to
migrate
data.
The
following
example
shows
how
to
create
a
mirror
copy
of
a
logical
volume
using
the
mklvcopy
command:
#
mklvcopy
-e
m
-s
y
-k
datalv
2
hdisk3
hdisk7
.
.
.
#
splitlvcopy
-y
splitlv
datalv
1
The
mklvcopy
command
options
specify
the
following
values:
(-e
m)
To
use
minimum
inter-disk
allocation
policy
(-s
y)
To
strictly
allocate
mirror
copies
on
separate
physical
volumes
(-k)
To
synchronize
new
copies
immediately
datalv
The
name
of
the
logical
volume
where
you
want
to
start
a
mirroring
operation
2
The
number
of
copies
that
you
want
to
make
of
the
data
(a
maximum
of
3)
hdisk3
and
hdisk7
The
physical
volumes
where
the
logical
volume
resides
hdisk3
The
physical
volume
that
already
holds
the
data
of
datalv
hdisk7
The
physical
volume
that
will
hold
the
mirror
copy
and
where
you
want
to
move
the
data
The
second
example
is
similar
to
example
1.
The
mklvcopy
command
starts
mirroring
the
infxlv
logical
volume.
#
mklvcopy
-e
m
-s
y
-k
infxlv
2
hdisk4
hdisk10
.
.
.
#
rmlvcopy
infxlv
1
hdisk4
In
this
example,
hdisk4
is
where
the
data
for
infxlv
already
exists,
and
hdisk10
is
where
the
mirror
copy
resides.
It
is
also
where
you
want
to
ultimately
move
the
data.
144
DS8000
User’s
Guide
Summary of Contents for DS8000 - ADDITIONAL INFORMATION
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