<s>
Xsan	B-Application
(	O
)	O
is	O
Apple	O
Inc.	O
'	O
s	O
storage	O
area	O
network	O
(	O
SAN	O
)	O
or	O
clustered	O
file	B-Application
system	I-Application
for	O
macOS	B-Application
.	O
</s>
<s>
Xsan	B-Application
enables	O
multiple	O
Mac	O
desktop	O
and	O
Xserve	B-Device
systems	O
to	O
access	O
shared	O
block	B-General_Concept
storage	I-General_Concept
over	O
a	O
Fibre	B-Architecture
Channel	I-Architecture
network	O
.	O
</s>
<s>
With	O
the	O
Xsan	B-Application
file	B-Application
system	I-Application
installed	O
,	O
these	O
computers	O
can	O
read	O
and	O
write	O
to	O
the	O
same	O
storage	O
volume	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
Xsan	B-Application
is	O
a	O
complete	O
SAN	O
solution	O
that	O
includes	O
the	O
metadata	B-General_Concept
controller	I-General_Concept
software	O
,	O
the	O
file	B-Application
system	I-Application
client	O
software	O
,	O
and	O
integrated	O
setup	O
,	O
management	O
and	O
monitoring	O
tools	O
.	O
</s>
<s>
Xsan	B-Application
has	O
all	O
the	O
normal	O
features	O
to	O
be	O
expected	O
in	O
an	O
enterprise	O
shared	O
disk	B-Application
file	I-Application
system	I-Application
,	O
including	O
support	O
for	O
large	O
files	O
and	O
file	B-Application
systems	I-Application
,	O
multiple	O
mounted	O
file	B-Application
systems	I-Application
,	O
metadata	B-General_Concept
controller	I-General_Concept
failover	O
for	O
fault	O
tolerance	O
,	O
and	O
support	O
for	O
multiple	O
operating	O
systems	O
.	O
</s>
<s>
Xsan	B-Application
is	O
based	O
on	O
the	O
StorNext	O
File	B-Application
System	I-Application
made	O
by	O
Quantum	O
Corporation	O
.	O
</s>
<s>
The	O
StorNext	O
File	B-Application
System	I-Application
and	O
the	O
Xsan	B-Application
file	B-Application
system	I-Application
share	O
the	O
same	O
file	B-Application
system	I-Application
layout	O
and	O
the	O
same	O
protocol	O
when	O
talking	O
to	O
the	O
metadata	O
server	O
.	O
</s>
<s>
They	O
also	O
seem	O
to	O
share	O
a	O
common	O
code	O
base	O
or	O
very	O
close	O
development	O
based	O
on	O
the	O
new	O
features	O
developed	O
for	O
both	O
file	B-Application
systems	I-Application
.	O
</s>
<s>
The	O
Xsan	B-Application
website	O
claims	O
complete	O
interoperability	O
with	O
the	O
StorNext	O
File	B-Application
System	I-Application
:	O
"	O
And	O
because	O
Xsan	B-Application
is	O
completely	O
interoperable	O
with	O
Quantum	O
’s	O
StorNext	O
File	B-Application
System	I-Application
,	O
you	O
can	O
even	O
provide	O
clients	O
on	O
Windows	O
,	O
Linux	O
,	O
and	O
other	O
UNIX	O
platforms	O
with	O
direct	O
Fibre	B-Architecture
Channel	I-Architecture
block-level	O
access	O
to	O
the	O
data	O
in	O
your	O
Xsan-managed	O
storage	O
pool.	O
"	O
</s>
<s>
Quantum	O
Corporation	O
claims	O
:	O
"	O
Complete	O
interoperability	O
with	O
Apple	O
’s	O
Xsan	B-Application
and	O
Promise	O
RAID	O
and	O
Allows	O
Xsan	B-Application
and	O
Xserve	B-Device
RAID	O
to	O
support	O
AIX	O
,	O
HP-UX	O
,	O
IRIX	O
,	O
Red	O
Hat	O
Linux	O
,	O
SuSE	O
Linux	O
,	O
Mac	B-Application
OS	I-Application
X	O
,	O
Solaris	O
,	O
and	O
Windows	O
clients	O
,	O
including	O
support	O
for	O
64	O
Bit	O
Windows	O
and	O
Windows	O
Vista.	O
"	O
</s>
<s>
Some	O
of	O
the	O
command	O
line	O
tools	O
for	O
Xsan	B-Application
begin	O
with	O
the	O
letters	O
cv	O
,	O
which	O
stand	O
for	O
CentraVision	O
–	O
the	O
original	O
name	O
for	O
the	O
file	B-Application
system	I-Application
.	O
</s>
<s>
XSan	B-Application
clients	O
use	O
TCP	O
ports	O
49152	O
–	O
65535	O
,	O
with	O
TCP/63146	O
frequently	O
showing	O
in	O
log	O
files	O
.	O
</s>
<s>
Xsan	B-Application
file	B-Application
system	I-Application
uses	O
several	O
logical	O
storages	O
to	O
distribute	O
information	O
.	O
</s>
<s>
The	O
two	O
main	O
classes	O
of	O
information	O
appear	O
on	O
Xsan	B-Application
:	O
the	O
user	O
data	O
(	O
such	O
as	O
files	O
)	O
and	O
the	O
file	B-Application
system	I-Application
metadata	O
(	O
such	O
as	O
folders	O
,	O
file	O
names	O
,	O
file	O
allocation	O
information	O
and	O
so	O
on	O
)	O
.	O
</s>
<s>
The	O
file	B-Application
system	I-Application
supports	O
dynamic	O
expansion	O
and	O
distribution	O
of	O
both	O
data	O
and	O
metadata	O
areas	O
.	O
</s>
<s>
On	O
January	O
4	O
,	O
2005	O
,	O
Apple	O
announced	O
shipping	O
of	O
Xsan	B-Application
.	O
</s>
<s>
In	O
May	O
2006	O
,	O
Apple	O
released	O
Xsan	B-Application
1.2	O
with	O
support	O
for	O
volume	O
sizes	O
of	O
nearly	O
2	O
petabytes	O
.	O
</s>
<s>
On	O
August	O
7	O
,	O
2006	O
,	O
Apple	O
announced	O
Xsan	B-Application
1.4	O
,	O
which	O
is	O
available	O
for	O
Intel-based	O
Macintosh	O
computers	O
as	O
a	O
Universal	B-Operating_System
binary	I-Operating_System
and	O
supports	O
file	B-Application
system	I-Application
access	O
control	O
lists	O
.	O
</s>
<s>
On	O
December	O
5	O
,	O
2006	O
,	O
Apple	O
released	O
Xsan	B-Application
1.4.1	O
.	O
</s>
<s>
On	O
October	O
18	O
,	O
2007	O
,	O
Apple	O
released	O
Xsan	B-Application
1.4.2	O
,	O
which	O
resolves	O
several	O
reliability	O
and	O
compatibility	O
issues	O
.	O
</s>
<s>
On	O
February	O
19	O
,	O
2008	O
,	O
Apple	O
released	O
Xsan	B-Application
2	O
,	O
the	O
first	O
major	O
update	O
,	O
which	O
introduces	O
MultiSAN	O
,	O
and	O
completely	O
redesigned	O
administration	O
tools	O
.	O
</s>
<s>
On	O
July	O
20	O
,	O
2011	O
,	O
Apple	O
released	O
Xsan	B-Application
2.3	O
,	O
included	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
.	O
</s>
<s>
This	O
was	O
the	O
first	O
version	O
of	O
Xsan	B-Application
included	O
with	O
macOS	B-Application
.	O
</s>
<s>
On	O
August	O
25	O
,	O
2011	O
,	O
Apple	O
released	O
Xsan	B-Application
2.2.2	O
,	O
which	O
brought	O
along	O
several	O
reliability	O
fixes	O
.	O
</s>
<s>
On	O
July	O
25	O
,	O
2012	O
,	O
Apple	O
released	O
Xsan	B-Application
3	O
,	O
included	O
in	O
OS	B-Operating_System
X	I-Operating_System
Mountain	I-Operating_System
Lion	I-Operating_System
.	O
</s>
<s>
On	O
October	O
17	O
,	O
2014	O
,	O
Apple	O
released	O
Xsan	B-Application
4	O
with	O
OS	B-Device
X	I-Device
Yosemite	I-Device
.	O
</s>
<s>
On	O
September	O
20	O
,	O
2016	O
,	O
Apple	O
released	O
Xsan	B-Application
5	O
with	O
macOS	B-Operating_System
Sierra	I-Operating_System
and	O
macOS	B-Operating_System
Server	I-Operating_System
5.2	O
.	O
</s>
<s>
On	O
November	O
12	O
,	O
2020	O
,	O
Apple	O
release	O
Xsan	B-Application
7	O
with	O
macOS	B-Operating_System
Big	I-Operating_System
Sur	I-Operating_System
.	O
</s>
