Path
connections
Before
you
can
create
source
and
target
remote
mirror
and
copy
copy
pair
relationships,
you
must
establish
logical
paths
between
a
logical
subsystem
(LSS)
in
a
source
storage
unit
and
an
LSS
in
a
target
storage
unit.
When
you
implement
a
remote
mirror
and
copy
configuration,
the
definition
of
paths
that
remote
mirror
and
copy
uses
is
an
important
consideration.
To
establish
paths,
you
must
have
Fibre
Channel
Protocol
(FCP)
adapters
on
both
the
source
and
target
storage
unit
for
the
peer-to-peer
links.
Paths
are
required
for
communicating
between
volume
pairs
and
for
copying
data
from
a
source
volume
to
a
target
volume.
You
can
establish
FCP
paths
to
connect
to
a
source
LSS
and
a
target
LSS
that
contain
count-key-data
(CKD)
or
fixed
block
(FB)
volumes.
The
requirement
is
that
both
the
source
LSS
and
target
LSS
must
contain
the
same
type
of
volumes.
You
can
define
from
one
to
eight
FCP
paths,
depending
on
the
capability
of
the
LSS,
from
a
single
source
site
LSS
to
a
specific
target
site
LSS.
When
you
establish
remote
mirror
and
copy
paths
over
FCP
links,
the
source
storage
unit
uses
a
worldwide
port
name
(WWPN)
to
communicate
with
the
target
storage
unit.
The
worldwide
node
name
(WWNN)
and
system
adapters
identification
(SAID)
of
the
source
and
destination
adapters
are
used
to
generate
a
WWPN.
A
WWPN
consists
of
exactly
16
hexadecimal
digits.
The
hexadecimal
characters
are
0–9,
a–f,
and
A–F.
The
values
for
the
WWNN
and
the
WWPN
must
be
unique.
With
FCP,
a
single
fibre
channel
link
between
two
ports
enables
bi-directional
remote
mirror
and
copy
operations.
This
means
that
it
is
possible
to
send
and
receive
data
in
both
directions
simultaneously.
For
example,
one
link
can
have
a
path
that
is
established
in
one
direction
and
then
have
another
path
that
is
established
in
another
direction
at
the
same
time,
on
the
same
physical
path.
While
a
FCP
interface
can
accommodate
simultaneous
data
transfers,
it
does
have
limited
bandwidth.
To
distribute
workload
evenly
to
all
available
paths,
the
storage
unit
monitors
the
overall
workload
on
each
port
and
selects
paths
that
are
determined
by
the
size
of
the
data
transfer,
the
available
bandwidth
available
on
each
FCP
port,
and
the
number
of
data
transfers,
currently
processing
on
each
port.
Selecting
paths
in
this
manner
ensures
good
response
time
and
overall
system
throughput.
Remote
Mirror
and
Copy
Remote
mirror
and
copy
is
a
storage
server
feature
that
constantly
updates
a
target
copy
of
a
volume
so
that
it
matches
changes
that
were
made
to
its
associated
source
volume.
The
remote
mirror
and
copy
feature
is
a
hardware
solution
that
enables
the
mirroring
of
data
from
one
site
(the
local
site)
and
its
associated
volumes
(source
volumes)
to
a
second
storage
unit
at
another
site
(the
recovery
or
remote
site)
and
its
volumes
(target
volumes).
Note:
Remote
mirror
and
copy
was
referred
to
as
Peer-to-Peer
Remote
Copy
(PPRC)
in
earlier
documentation
for
the
IBM
TotalStorage
Enterprise
Storage
Server.
Currently,
the
remote
mirror
and
copy
feature
name
is
used
generically
for
all
methods
of
synchronous
and
asynchronous
methods.
In
116
DS8000
User’s
Guide
Содержание TotalStorage DS8000
Страница 1: ...IBM TotalStorage DS8000 User s Guide SC26 7623 03...
Страница 2: ......
Страница 3: ...IBM TotalStorage DS8000 User s Guide SC26 7623 03...
Страница 10: ...viii DS8000 User s Guide...
Страница 12: ...x DS8000 User s Guide...
Страница 14: ...xii DS8000 User s Guide...
Страница 24: ...Department 61C 9032 South Rita Road TUCSON AZ 85775 4401 xxii DS8000 User s Guide...
Страница 26: ...xxiv DS8000 User s Guide...
Страница 50: ...24 DS8000 User s Guide...
Страница 116: ...90 DS8000 User s Guide...
Страница 120: ...94 DS8000 User s Guide...
Страница 152: ...126 DS8000 User s Guide...
Страница 166: ...140 DS8000 User s Guide...
Страница 184: ...158 DS8000 User s Guide...
Страница 186: ...160 DS8000 User s Guide...
Страница 192: ...Taiwan class A compliance statement VS07171L 166 DS8000 User s Guide...
Страница 227: ......
Страница 228: ...Printed in USA SC26 7623 03...