<s>
Nexenta	B-Application
OS	I-Application
,	O
officially	O
known	O
as	O
the	O
Nexenta	O
Core	O
Platform	O
,	O
is	O
a	O
discontinued	O
computer	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
based	O
on	O
OpenSolaris	B-Operating_System
and	O
Ubuntu	B-Operating_System
that	O
runs	O
on	O
IA-32	B-Device
-	O
and	O
x86-64-based	O
systems	O
.	O
</s>
<s>
It	O
emerged	O
in	O
fall	O
2005	O
,	O
after	O
Sun	O
Microsystems	O
started	O
the	O
OpenSolaris	B-Operating_System
project	O
in	O
June	O
of	O
that	O
year	O
.	O
</s>
<s>
Nexenta	B-Application
OS	I-Application
version	O
1.0	O
was	O
released	O
in	O
February	O
2008	O
.	O
</s>
<s>
In	O
late	O
2011	O
,	O
the	O
Nexenta	B-Application
OS	I-Application
brand	O
was	O
terminated	O
and	O
replaced	O
with	O
Illumian	B-Application
,	O
which	O
is	O
derived	O
from	O
community	O
development	O
for	O
illumos	B-Application
and	O
OpenIndiana	B-Application
,	O
but	O
was	O
distinguished	O
by	O
its	O
use	O
of	O
Debian	O
packaging	O
.	O
</s>
<s>
Illumian	B-Application
version	O
1.0	O
was	O
released	O
in	O
February	O
2012	O
.	O
</s>
<s>
Following	O
the	O
initial	O
release	O
of	O
Illumian	B-Application
in	O
2012	O
,	O
the	O
Illumian	B-Application
project	O
was	O
discontinued	O
.	O
</s>
<s>
There	O
were	O
initially	O
two	O
official	O
APT	B-Application
repositories	O
:	O
"	O
testing	O
"	O
and	O
"	O
unstable	O
"	O
,	O
totalling	O
more	O
than	O
9000	O
packages	O
.	O
</s>
<s>
Nexenta	B-Application
OS	I-Application
is	O
available	O
as	O
InstallCD	O
and	O
VMware	O
images	O
.	O
</s>
<s>
Nexenta	O
repositories	O
follow	O
the	O
general	O
Debian	O
structure	O
(	O
main	O
contrib	O
non-free	O
)	O
.	O
</s>
<s>
Packages	O
originate	O
from	O
Debian	O
GNU/Linux	B-Application
.	O
</s>
<s>
Since	O
Nexenta	B-Application
OS	I-Application
does	O
not	O
use	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
and	O
Sun	O
only	O
recently	O
began	O
releasing	O
the	O
code	O
of	O
their	O
Solaris	B-Application
operating	I-Application
system	I-Application
as	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
,	O
it	O
supports	O
less	O
diverse	O
hardware	O
than	O
other	O
Debian	O
variants	O
.	O
</s>
<s>
The	O
Nexenta	B-Application
OS	I-Application
team	O
has	O
decided	O
to	O
focus	O
on	O
a	O
minimal	O
OpenSolaris	B-Operating_System
effort	O
called	O
the	O
Nexenta	O
Core	O
Platform	O
(	O
NCP	O
)	O
which	O
forms	O
the	O
basis	O
of	O
the	O
NexentaStor	O
NAS	B-Application
storage	O
solution	O
.	O
</s>
<s>
Nexenta	O
Core	O
Platform	O
was	O
the	O
first	O
operating	B-General_Concept
system	I-General_Concept
to	O
combine	O
the	O
OpenSolaris	B-Operating_System
kernel	B-Operating_System
with	O
GNU	B-Operating_System
userland	O
tools	O
.	O
</s>
<s>
It	O
aimed	O
to	O
bring	O
technologies	O
such	O
as	O
ZFS	B-Application
and	O
Zones	O
to	O
the	O
GNU/Debian	O
community	O
.	O
</s>
<s>
An	O
additional	O
purpose	O
of	O
the	O
OS	O
was	O
to	O
provide	O
a	O
kernel	B-Operating_System
allowing	O
proprietary	O
closed	O
source	O
hardware	O
drivers	O
to	O
be	O
produced	O
for	O
inclusion	O
in	O
an	O
open	B-Application
source	I-Application
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
It	O
was	O
based	O
on	O
Ubuntu	B-Operating_System
6.06	O
"	O
Dapper	O
Drake	O
"	O
and	O
OpenSolaris	B-Operating_System
b82	O
.	O
</s>
<s>
It	O
included	O
packages	O
based	O
on	O
Ubuntu	B-Operating_System
8.04	O
"	O
Hardy	O
Heron	O
"	O
LTS	O
.	O
</s>
<s>
The	O
release	O
included	O
many	O
updated	O
packages	O
,	O
support	O
for	O
ZFS	B-Application
deduplication	O
,	O
and	O
Crossbow	O
support	O
,	O
among	O
other	O
fixes	O
.	O
</s>
<s>
NexentaStor	O
is	O
a	O
proprietary	O
operating	B-General_Concept
system	I-General_Concept
built	O
by	O
Nexenta	O
Systems	O
on	O
top	O
of	O
the	O
Nexenta	O
Core	O
Platform	O
.	O
</s>
<s>
It	O
is	O
optimized	O
for	O
use	O
in	O
virtualized	O
server	O
environments	O
including	O
NAS	B-Application
,	O
iSCSI	B-Protocol
,	O
and	O
Fibre	B-Architecture
Channel	I-Architecture
applications	O
,	O
and	O
is	O
built	O
around	O
the	O
ZFS	B-Application
file	O
system	O
.	O
</s>
<s>
It	O
features	O
iSCSI	B-Protocol
support	O
,	O
unlimited	O
incremental	O
backups	O
or	O
'	O
snapshots	O
 '	O
,	O
snapshot	O
mirroring	O
(	O
replication	O
)	O
,	O
block	O
level	O
mirroring	O
(	O
CDP	B-General_Concept
)	O
,	O
integrated	O
search	O
within	O
ZFS	B-Application
snapshots	O
and	O
a	O
custom	O
API	O
.	O
</s>
<s>
Through	O
its	O
focus	O
on	O
ZFS	B-Application
,	O
it	O
carries	O
with	O
it	O
potential	O
benefits	O
for	O
virtualized	O
server	O
farms	O
in	O
terms	O
of	O
performance	O
and	O
thin	B-General_Concept
provisioning	I-General_Concept
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
is	O
currently	O
distributed	O
as	O
ISO	B-Application
and	O
VMware	O
disk	B-Application
images	I-Application
with	O
pricing	O
determined	O
on	O
a	O
per-terabyte	O
and	O
per-server	O
licensing	O
basis	O
.	O
</s>
<s>
A	O
"	O
community	O
edition	O
"	O
was	O
available	O
free	B-Application
of	O
charge	O
for	O
users	O
with	O
less	O
than	O
18	O
terabytes	O
of	O
raw	O
disk	O
space	O
(	O
pre-redundancy	O
and	O
volume	O
creation	O
)	O
.	O
</s>
<s>
This	O
free	B-Application
tier	O
model	O
changed	O
with	O
the	O
release	O
of	O
version	O
5.0	O
(	O
community	O
edition	O
only	O
)	O
to	O
a	O
10	O
terabyte	O
limit	O
of	O
assigned	O
and	O
usable	O
(	O
post-redundancy	O
and	O
volume	O
creation	O
)	O
disk	O
space	O
.	O
</s>
<s>
It	O
can	O
install	O
many	O
of	O
the	O
free	B-Application
and	O
open	B-Application
source	I-Application
plugins	O
that	O
are	O
developed	O
and	O
hosted	O
on	O
the	O
community	O
edition	O
website	O
.	O
</s>
<s>
The	O
ReadyDATAOS	O
firmware	O
is	O
an	O
embedded	O
network-attached	B-Application
storage	I-Application
(	O
NAS	B-Application
)	O
distribution	O
based	O
on	O
Nexenta	B-Application
OS	I-Application
and	O
has	O
the	O
same	O
ZFS	B-Application
support	O
as	O
Nexenta	B-Application
OS	I-Application
.	O
</s>
