automatically
maintained
at
the
remote
site.
See
also
Metro
Mirror
and
Remote
Mirror
and
Copy
.
group
In
DS8000
documentation,
a
nickname
for
two
different
kinds
of
groups,
depending
on
the
context.
See
disk
pack
or
Copy
Services
server
group
.
H
HA
See
host
adapter
.
HACMP
See
High-Availability
Cluster
Multi-Processing
.
hard
disk
drive
(HDD)
1)
A
storage
medium
within
a
storage
server
used
to
maintain
information
that
the
storage
server
requires.
2)
A
mass
storage
medium
for
computers
that
is
typically
available
as
a
fixed
disk
(such
as
the
disks
used
in
system
units
of
personal
computers
or
in
drives
that
are
external
to
a
personal
computer)
or
a
removable
cartridge.
hardware
service
manager
(HSM)
An
option
on
an
AS/400
or
iSeries
host
that
enables
the
user
to
display
and
work
with
system
hardware
resources
and
to
debug
input-output
processors
(IOP),
input-output
adapters
(IOA),
and
devices.
HCD
See
Hardware
Configuration
Data
.
HDA
See
head
and
disk
assembly
.
HDD
See
hard
disk
drive
.
hdisk
An
AIX
term
for
storage
space.
head
and
disk
assembly
(HDA)
The
portion
of
an
HDD
associated
with
the
medium
and
the
read/write
head.
heartbeat
A
status
report
sent
at
regular
intervals
from
the
DS8000.
The
service
provider
uses
this
report
to
monitor
the
health
of
the
call
home
process.
See
also
call
home
,
heartbeat
call
home
record
,
and
remote
technical
assistance
information
network
.
heartbeat
call
home
record
Machine
operating
and
service
information
sent
to
a
service
machine.
These
records
might
include
such
information
as
feature
code
information
and
product
logical
configuration
information.
hierarchical
storage
management
1)
A
function
in
storage
management
software,
such
as
Tivoli
Storage
Management
or
Data
Facility
Storage
Management
Subsystem/MVS
(DFSMS/MVS),
that
automatically
manages
free
space
based
on
the
policy
that
the
storage
administrator
sets.
2)
In
AS/400
storage
management,
an
automatic
method
to
manage
and
distribute
data
between
the
different
storage
layers,
such
as
disk
units
and
tape
library
devices.
High-Availability
Cluster
Multi-Processing
(HACMP)
Software
that
provides
host
clustering,
so
that
a
failure
of
one
host
is
recovered
by
moving
jobs
to
other
hosts
within
the
cluster.
high-speed
link
(HSL)
A
hardware
connectivity
architecture
that
links
system
processors
to
system
input/output
buses
and
other
system
units.
home
address
A
nine-byte
field
at
the
beginning
of
a
track
that
contains
information
that
identifies
the
physical
track
and
its
association
with
a
cylinder.
hop
Interswitch
connection.
A
hop
count
is
the
number
of
connections
that
a
particular
block
of
data
traverses
between
source
and
destination.
For
example,
data
traveling
from
one
hub
over
a
wire
to
another
hub
traverses
one
hop.
host
See
host
system
.
host
adapter
A
physical
subunit
of
a
storage
server
that
provides
the
ability
to
attach
to
one
or
more
host
I/O
interfaces.
host
name
The
Internet
address
of
a
machine
in
the
network.
The
host
name
can
be
entered
in
the
host
definition
as
the
fully
qualified
domain
name
of
the
attached
host
system,
such
as
mycomputer.city.company.com
,
or
as
the
subname
of
the
fully
qualified
domain
name,
for
example,
mycomputer
.
See
also
host
system
.
178
DS8000
User’s
Guide
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