IBM TOTAL STORAGE DS8000 User Manual
Page 367
device
that
is
used
in
protocols
on
the
SCSI
interface
to
identify
or
select
the
device.
The
number
of
data
bits
on
the
SCSI
bus
determines
the
number
of
available
SCSI
IDs.
A
wide
interface
has
16
bits,
with
16
possible
IDs.
SDD
See
IBM
Subsystem
Multipathing
Device
Driver.
secondary
control
unit
The
DS8000
to
which
a
Remote
Mirror
and
Copy
secondary
device
is
physically
attached.
self-timed
interface
(STI)
An
interface
that
has
one
or
more
conductors
that
transmit
information
serially
between
two
interconnected
units
without
requiring
any
clock
signals
to
recover
the
data.
The
interface
performs
clock
recovery
independently
on
each
serial
data
stream
and
uses
information
in
the
data
stream
to
determine
character
boundaries
and
inter-conductor
synchronization.
sequential
access
A
mode
of
accessing
data
on
a
medium
in
a
manner
that
requires
the
storage
device
to
access
consecutive
storage
locations
on
the
medium.
sequential
access
method
(SAM)
An
access
method
for
storing,
deleting,
or
retrieving
data
in
a
continuous
sequence
based
on
the
logical
order
of
the
records
in
the
file.
serial
connection
A
method
of
device
interconnection
for
determining
interrupt
priority
by
connecting
the
interrupt
sources
serially.
server
A
host
that
provides
certain
services
to
other
hosts
that
are
referred
to
as
clients.
A
functional
unit
that
provides
services
to
one
or
more
clients
over
a
network.
(GC)
service
boundary
A
category
that
identifies
a
group
of
components
that
are
unavailable
for
use
when
one
of
the
components
of
the
group
is
being
serviced.
Service
boundaries
are
provided
on
the
DS8000,
for
example,
in
each
host
bay
and
in
each
cluster.
service
clearance
The
area
that
is
required
to
open
the
service
covers
and
to
pull
out
components
for
servicing.
service
information
message
(SIM)
A
message
sent
by
a
storage
server
to
service
personnel
through
an
zSeries
operating
system.
service
personnel
A
generalization
referring
to
individuals
or
companies
authorized
to
service
the
DS8000.
The
terms
service
provider,
service
representative,
and
IBM
service
support
representative
(SSR)
refer
to
types
of
service
personnel.
See
also
service
support
representative.
service
processor
A
dedicated
processing
unit
that
is
used
to
service
a
storage
unit.
service
support
representative
(SSR)
Individuals
or
a
company
authorized
to
service
the
DS8000.
This
term
also
refers
to
a
service
provider,
a
service
representative,
or
an
IBM
service
support
representative
(SSR).
An
IBM
SSR
installs
the
DS8000.
SES
SCSI
Enclosure
Services.
session
A
collection
of
volumes
within
a
logical
subsystem
that
are
managed
together
during
the
creation
of
consistent
copies
of
data.
All
volumes
in
a
session
must
transfer
their
data
successfully
to
the
remote
site
before
the
increment
can
be
called
complete.
SFP
Small
form
factor
pluggables.
shared
storage
Storage
that
is
configured
so
that
multiple
hosts
can
concurrently
access
the
storage.
The
storage
has
a
uniform
appearance
to
all
hosts.
The
host
programs
that
access
the
storage
must
have
a
common
model
for
the
information
on
a
storage
device.
The
programs
must
be
designed
to
handle
the
effects
of
concurrent
access.
shortwave
laser
adapter
A
connector
that
is
used
between
host
and
DS8000
to
support
shortwave
fibre-channel
communication.
SIM
See
service
information
message.
Glossary
347