<s>
Scale	O
out	O
File	O
Services	O
(	O
SoFS	B-Application
)	O
is	O
a	O
highly	O
scalable	O
,	O
grid-based	O
NAS	B-Application
implementation	O
developed	O
by	O
IBM	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
IBM	O
's	O
high-performance	O
shared-disk	O
clustered	B-Architecture
file	I-Architecture
system	I-Architecture
Spectrum	B-Application
Scale	I-Application
.	O
</s>
<s>
SoFS	B-Application
exports	O
the	O
clustered	B-Architecture
file	I-Architecture
system	I-Architecture
through	O
industry	O
standard	O
protocols	O
like	O
SMB	B-Operating_System
,	O
NFS	B-Protocol
,	O
FTP	B-Protocol
and	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
Released	O
in	O
2007	O
,	O
SoFS	B-Application
is	O
a	O
second	O
generation	O
file	O
services	O
architecture	O
used	O
within	O
IBM	O
since	O
2001	O
.	O
</s>
<s>
All	O
of	O
the	O
SoFS	B-Application
nodes	O
in	O
the	O
grid	O
export	O
all	O
files	O
of	O
all	O
file	O
systems	O
simultaneously	O
.	O
</s>
<s>
This	O
is	O
a	O
different	O
approach	O
from	O
some	O
other	O
clustered	O
NAS	B-Application
implementations	O
which	O
pin	O
individual	O
files	O
to	O
a	O
single	O
node	O
or	O
pair	O
of	O
nodes	O
thus	O
limiting	O
the	O
single	O
file	O
performance	O
dramatically	O
.	O
</s>
<s>
SoFS	B-Application
combines	O
proprietary	B-Application
IBM	O
technology	O
(	O
block	O
storage	O
and	O
compute	O
servers	O
and	O
Spectrum	B-Application
Scale	I-Application
)	O
with	O
open	O
source	O
components	O
including	O
Linux	B-Application
,	O
Samba	B-Language
,	O
and	O
.	O
</s>
<s>
Since	O
February	O
2010	O
,	O
IBM	O
is	O
offering	O
a	O
hardened	O
appliance	O
version	O
of	O
SoFS	B-Application
,	O
called	O
Scale	O
Out	O
Network	B-Application
Attached	I-Application
Storage	I-Application
(	O
)	O
.	O
</s>
<s>
Technically	O
,	O
SONAS	O
uses	O
an	O
internal	O
Infiniband	B-Architecture
network	O
to	O
get	O
low	O
latency	O
and	O
high	O
cluster	O
throughput	O
.	O
</s>
<s>
The	O
cluster	O
architecture	O
is	O
derived	O
from	O
leading	O
Top500	B-Operating_System
supercomputer	O
designs	O
.	O
</s>
