<s>
RozoFS	B-Application
is	O
a	O
free	B-Application
software	I-Application
distributed	B-Protocol
file	I-Protocol
system	I-Protocol
.	O
</s>
<s>
It	O
comes	O
as	O
a	O
free	B-Application
software	I-Application
,	O
licensed	O
under	O
the	O
GNU	B-License
GPL	I-License
v2	O
.	O
</s>
<s>
RozoFS	B-Application
uses	O
erasure	O
coding	O
for	O
redundancy	O
.	O
</s>
<s>
Rozo	O
provides	O
an	O
open	O
source	O
POSIX	O
filesystem	O
,	O
built	O
on	O
top	O
of	O
distributed	B-Protocol
file	I-Protocol
system	I-Protocol
architecture	O
similar	O
to	O
Google	B-Application
File	I-Application
System	I-Application
,	O
Lustre	B-Application
or	O
Ceph	B-Operating_System
.	O
</s>
<s>
The	O
data	O
to	O
be	O
stored	O
is	O
translated	O
into	O
several	O
chunks	O
using	O
Mojette	B-Algorithm
Transform	I-Algorithm
and	O
distributed	O
across	O
storage	O
devices	O
in	O
such	O
a	O
way	O
that	O
it	O
can	O
be	O
retrieved	O
even	O
if	O
several	O
pieces	O
are	O
unavailable	O
.	O
</s>
<s>
Redundancy	O
schemes	O
based	O
on	O
coding	O
techniques	O
like	O
the	O
one	O
used	O
by	O
RozoFS	B-Application
allow	O
to	O
achieve	O
significant	O
storage	O
savings	O
as	O
compared	O
to	O
simple	O
replication	O
.	O
</s>
<s>
Multiple	O
replicated	O
metadata	O
servers	O
are	O
used	O
to	O
provide	O
failover	B-General_Concept
.	O
</s>
<s>
The	O
Exports	O
server	O
is	O
a	O
user-space	O
daemon	B-Operating_System
;	O
the	O
metadata	O
are	O
stored	O
synchronously	O
to	O
a	O
usual	O
file	O
system	O
(	O
the	O
underlying	O
file	O
system	O
must	O
support	O
extended	O
attributes	O
)	O
.	O
</s>
<s>
The	O
Chunk	O
server	O
is	O
also	O
a	O
user-space	O
daemon	B-Operating_System
that	O
relies	O
on	O
the	O
underlying	O
local	O
file	O
system	O
to	O
manage	O
the	O
actual	O
storage	O
.	O
</s>
<s>
Clients	O
mount	O
the	O
file	O
system	O
into	O
user-space	O
via	O
FUSE	B-Application
.	O
</s>
