<s>
Xserve	B-Device
is	O
a	O
line	O
of	O
rack	O
unit	O
computers	O
designed	O
by	O
Apple	O
Inc	O
.	O
for	O
use	O
as	O
servers	O
.	O
</s>
<s>
Introduced	O
in	O
2002	O
,	O
it	O
was	O
Apple	O
's	O
first	O
designated	O
server	B-Application
hardware	O
design	O
since	O
the	O
Apple	B-Device
Network	I-Device
Server	I-Device
in	O
1996	O
.	O
</s>
<s>
In	O
the	O
meantime	O
,	O
ordinary	O
Power	O
Macintosh	O
G3	O
and	O
G4	O
models	O
were	O
rebranded	O
as	O
Macintosh	B-Device
Server	I-Device
G3	O
and	O
Macintosh	B-Device
Server	I-Device
G4	O
with	O
some	O
alterations	O
to	O
the	O
hardware	O
,	O
such	O
as	O
added	O
Gigabit	O
Ethernet	O
cards	O
,	O
UltraWide	O
SCSI	O
cards	O
,	O
extra	O
large	O
and	O
fast	O
hard	B-Device
drives	I-Device
etc	O
.	O
</s>
<s>
and	O
shipped	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Server	I-Operating_System
software	O
.	O
</s>
<s>
The	O
Xserve	B-Device
initially	O
featured	O
one	O
or	O
two	O
processors	O
,	O
but	O
later	O
switched	O
over	O
to	O
the	O
then-new	O
transitioned	O
to	O
Intel	O
with	O
the	O
Core	O
2-based	O
Xeon	B-Device
offerings	O
and	O
subsequently	O
switched	O
again	O
to	O
two	O
quad-core	O
microprocessors	O
.	O
</s>
<s>
The	O
Xserve	B-Device
could	O
be	O
used	O
for	O
a	O
variety	O
of	O
applications	O
,	O
including	O
file	B-Application
server	I-Application
,	O
web	B-Application
server	I-Application
or	O
even	O
high-performance	B-Architecture
computing	I-Architecture
applications	O
using	O
clustering	B-Architecture
–	O
a	O
dedicated	O
cluster	O
Xserve	B-Device
,	O
the	O
Xserve	B-Device
Cluster	I-Device
Node	I-Device
,	O
without	O
a	O
video	O
card	O
and	O
optical	O
drives	O
was	O
also	O
available	O
.	O
</s>
<s>
On	O
November	O
5	O
,	O
2010	O
,	O
Apple	O
announced	O
that	O
the	O
Xserve	B-Device
line	O
would	O
be	O
discontinued	O
on	O
January	O
31	O
,	O
2011	O
and	O
replaced	O
with	O
the	O
Mac	O
Pro	O
Server	B-Application
and	O
the	O
Mac	O
Mini	O
Server	B-Application
.	O
</s>
<s>
Apple	O
introduced	O
the	O
Xserve	B-Device
on	O
May	O
14	O
,	O
2002	O
(	O
released	O
in	O
June	O
)	O
.	O
</s>
<s>
Initially	O
,	O
two	O
configuration	O
options	O
were	O
available	O
:	O
a	O
single-processor	O
Xserve	B-Device
at	O
US$2999	O
and	O
a	O
dual-processor	O
Xserve	B-Device
at	O
US$3999	O
.	O
</s>
<s>
Xserves	B-Device
sold	O
before	O
August	O
24	O
,	O
2002	O
shipped	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.1	I-Operating_System
"	O
Puma	O
"	O
Server	B-Application
,	O
while	O
those	O
sold	O
after	O
shipped	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
"	I-Operating_System
Jaguar	I-Operating_System
"	I-Operating_System
Server	B-Application
.	O
</s>
<s>
On	O
February	O
10	O
,	O
2003	O
,	O
Apple	O
released	O
an	O
improved	O
and	O
expanded	O
Xserve	B-Device
lineup	O
.	O
</s>
<s>
Improvements	O
included	O
one	O
or	O
two	O
1.33GHz	O
PowerPC	B-General_Concept
G4	I-General_Concept
processors	O
,	O
faster	O
memory	B-Architecture
,	O
and	O
higher	O
capacity	O
Ultra	O
ATA/133	O
hard	B-Device
disk	I-Device
drives	I-Device
.	O
</s>
<s>
A	O
new	O
model	O
,	O
the	O
Xserve	B-Device
Cluster	I-Device
node	I-Device
was	O
announced	O
at	O
the	O
same	O
price	O
as	O
the	O
single-processor	O
Xserve	B-Device
,	O
featuring	O
two	O
1.33GHz	O
processors	O
,	O
no	O
optical	O
drive	O
,	O
a	O
single	O
hard	B-Device
drive	I-Device
bay	O
,	O
no	O
video	O
or	O
Ethernet	O
cards	O
,	O
and	O
a	O
10-client	O
version	O
of	O
"	O
Jaguar	B-Operating_System
"	O
server	B-Application
.	O
</s>
<s>
On	O
April	O
2	O
,	O
2003	O
the	O
Xserve	B-Application
RAID	I-Application
was	O
introduced	O
,	O
providing	O
a	O
much	O
higher	O
capacity	O
and	O
higher	O
throughput	O
disk	B-Device
subsystem	I-Device
for	O
the	O
Xserve	B-Device
.	O
</s>
<s>
On	O
January	O
6	O
,	O
2004	O
Apple	O
introduced	O
the	O
Xserve	B-Device
G5	O
,	O
a	O
redesigned	O
higher-performance	O
Xserve	B-Device
.	O
</s>
<s>
The	O
32-bit	O
PowerPC	B-General_Concept
G4s	I-General_Concept
were	O
replaced	O
with	O
one	O
or	O
two	O
64-bit	O
PowerPC	B-General_Concept
970	I-General_Concept
processors	O
running	O
at	O
2GHz	O
.	O
</s>
<s>
Ventilation	O
issues	O
restricted	O
it	O
to	O
three	O
SATA	O
hot-swap	O
drive	B-Device
bays	I-Device
,	O
with	O
the	O
original	O
space	O
for	O
the	O
fourth	O
drive	B-Device
bay	I-Device
used	O
for	O
air	O
vents	O
.	O
</s>
<s>
The	O
front	O
plate	O
and	O
slot-loading	O
optical	O
drive	O
were	O
retained	O
from	O
the	O
last	O
Xserve	B-Device
G4	O
.	O
</s>
<s>
The	O
higher	O
memory	B-Architecture
capacity	O
and	O
bandwidth	O
as	O
well	O
as	O
the	O
stronger	O
floating-point	O
performance	O
of	O
the	O
PowerPC	B-General_Concept
970	I-General_Concept
made	O
it	O
more	O
suitable	O
for	O
high-performance	B-Architecture
computing	I-Architecture
(	O
HPC	O
)	O
applications	O
.	O
</s>
<s>
System	B-Device
X	I-Device
is	O
one	O
such	O
cluster	B-Architecture
computer	I-Architecture
built	O
with	O
Xserves	B-Device
.	O
</s>
<s>
Three	O
configuration	O
options	O
were	O
available	O
:	O
a	O
single-processor	O
model	O
at	O
US$2	O
,	O
999	O
,	O
a	O
dual-processor	O
model	O
at	O
$3	O
,	O
999	O
,	O
and	O
a	O
dual-processor	O
cluster	O
node	O
model	O
(	O
with	O
an	O
unchanged	O
appearance	O
from	O
the	O
G4	O
cluster	O
node	O
)	O
at	O
US$	O
2,999	O
.	O
</s>
<s>
On	O
January	O
3	O
,	O
2005	O
,	O
Apple	O
updated	O
the	O
Xserve	B-Device
G5	O
with	O
faster	O
processors	O
in	O
the	O
dual-processor	O
configurations	O
.	O
</s>
<s>
400	O
GB	O
hard	B-Device
disks	I-Device
were	O
made	O
available	O
for	O
up	O
to	O
1.2	O
TB	O
of	O
internal	O
storage	O
.	O
</s>
<s>
Soon	O
after	O
,	O
Apple	O
updated	O
the	O
Xserve	B-Device
and	O
Xserve	B-Application
RAID	I-Application
to	O
allow	O
the	O
use	O
of	O
500	O
GB	O
Hard	B-Device
Drives	I-Device
.	O
</s>
<s>
Xserve	B-Device
G5	O
models	O
before	O
April	O
2005	O
shipped	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
"	I-Operating_System
Panther	I-Operating_System
"	I-Operating_System
,	O
after	O
April	O
2005	O
shipped	O
with	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
"	I-Application
Tiger	I-Application
"	I-Application
.	O
</s>
<s>
The	O
Intel-based	O
Xserves	B-Device
were	O
announced	O
at	O
the	O
Worldwide	O
Developers	O
Conference	O
on	O
August	O
7	O
,	O
2006	O
,	O
and	O
are	O
significantly	O
faster	O
compared	O
to	O
the	O
Xserve	B-Device
G5	O
.	O
</s>
<s>
They	O
use	O
Intel	B-Device
Xeon	I-Device
( 	O
 '	O
Woodcrest	O
 '	O
)	O
processors	O
,	O
DDR2	O
ECC	O
FB-DIMMs	B-General_Concept
,	O
ATI	O
Radeon	O
graphics	O
,	O
a	O
maximum	O
storage	O
capacity	O
of	O
2.25	O
TB	O
when	O
used	O
with	O
three	O
750	O
GB	O
drives	O
,	O
optional	O
redundant	O
power	O
supplies	O
and	O
a	O
1U	O
rack	O
form	O
factor	O
.	O
</s>
<s>
The	O
Intel	O
Xserves	B-Device
now	O
had	O
on	O
board	O
video	O
,	O
freeing	O
up	O
an	O
expansion	O
slot	O
.	O
</s>
<s>
On	O
January	O
8	O
,	O
2008	O
Xserve	B-Device
was	O
updated	O
with	O
Intel	B-Device
Xeon	I-Device
( 	O
 '	O
Harpertown	O
 '	O
)	O
processors	O
,	O
faster	O
memory	B-Architecture
,	O
and	O
a	O
maximum	O
storage	O
capacity	O
of	O
3	O
TB	O
when	O
used	O
with	O
three	O
1	O
TB	O
drives	O
.	O
</s>
<s>
The	O
front-mounted	O
FireWire	B-Protocol
400	O
port	O
featured	O
in	O
previous	O
models	O
was	O
also	O
replaced	O
with	O
a	O
USB	B-Protocol
2.0	O
port	O
.	O
</s>
<s>
The	O
Xserve	B-Application
RAID	I-Application
was	O
discontinued	O
on	O
February	O
19	O
,	O
2008	O
.	O
</s>
<s>
On	O
April	O
7	O
,	O
2009	O
Xserve	B-Device
was	O
updated	O
to	O
use	O
Intel	B-Device
Xeon	I-Device
( 	O
 '	O
Gainestown	O
 '	O
)	O
processors	O
,	O
DDR3	O
memory	B-Architecture
,	O
and	O
NVIDIA	O
graphics	O
with	O
Mini	B-Protocol
DisplayPort	I-Protocol
output	O
.	O
</s>
<s>
An	O
option	O
to	O
add	O
a	O
SSD	B-Device
boot-drive	O
that	O
does	O
not	O
occupy	O
a	O
drive	B-Device
bay	I-Device
was	O
also	O
implemented	O
.	O
</s>
<s>
The	O
addition	O
of	O
the	O
SSD	B-Device
boot	O
drive	O
allows	O
all	O
drives	O
to	O
be	O
swapped	O
whilst	O
the	O
server	B-Application
remains	O
online	O
.	O
</s>
<s>
It	O
is	O
also	O
Apple	O
's	O
first	O
Xserve	B-Device
to	O
use	O
PVC-free	O
internal	O
cables	O
and	O
components	O
and	O
contain	O
no	O
brominated	O
flame	O
retardants	O
.	O
</s>
<s>
On	O
August	O
28	O
,	O
2009	O
Xserve	B-Device
was	O
updated	O
to	O
ship	O
standard	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Server	I-Operating_System
10.6	O
Unlimited	O
Client	O
Server	B-Application
.	O
</s>
<s>
In	O
addition	O
to	O
improved	O
functionality	O
Mac	O
OS	O
X	O
10.6	O
Server	B-Application
added	O
support	O
for	O
up	O
to	O
96	O
GB	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
On	O
November	O
5	O
,	O
2010	O
,	O
Apple	O
announced	O
that	O
it	O
would	O
not	O
be	O
developing	O
a	O
future	O
version	O
of	O
Xserve	B-Device
.	O
</s>
<s>
While	O
accepting	O
orders	O
for	O
the	O
current	O
model	O
until	O
January	O
31	O
,	O
2011	O
,	O
and	O
"	O
honoring	O
"	O
all	O
Xserve	B-Device
warranties	O
and	O
extended	O
support	O
programs	O
,	O
the	O
company	O
suggested	O
users	O
switch	O
to	O
Mac	O
Pro	O
Server	B-Application
or	O
Mac	O
Mini	O
Server	B-Application
.	O
</s>
