<s>
Amazon	B-General_Concept
Elastic	I-General_Concept
File	I-General_Concept
System	I-General_Concept
(	O
Amazon	B-Application
EFS	O
)	O
is	O
a	O
cloud	O
storage	O
service	O
provided	O
by	O
Amazon	B-Application
Web	I-Application
Services	I-Application
(	O
AWS	B-Application
)	O
designed	O
to	O
provide	O
scalable	B-Architecture
,	O
elastic	B-General_Concept
,	O
concurrent	B-Architecture
with	O
some	O
restrictions	O
,	O
and	O
encrypted	O
file	O
storage	O
for	O
use	O
with	O
both	O
AWS	B-Application
cloud	O
services	O
and	O
on-premises	O
resources	O
.	O
</s>
<s>
Amazon	B-Application
EFS	O
is	O
built	O
to	O
be	O
able	O
to	O
grow	O
and	O
shrink	O
automatically	O
as	O
files	O
are	O
added	O
and	O
removed	O
.	O
</s>
<s>
Amazon	B-Application
EFS	O
supports	O
Network	B-Protocol
File	I-Protocol
System	I-Protocol
(	O
NFS	O
)	O
versions	O
4.0	O
and	O
4.1	O
(	O
NFSv4	O
)	O
protocol	O
,	O
and	O
control	O
access	O
to	O
files	O
through	O
Portable	O
Operating	O
System	O
Interface	O
(	O
POSIX	O
)	O
permissions	O
.	O
</s>
<s>
According	O
to	O
Amazon	B-Application
,	O
use	B-Architecture
cases	I-Architecture
for	O
this	O
file	O
system	O
service	O
typically	O
include	O
content	B-Protocol
repositories	I-Protocol
,	O
development	O
environments	O
,	O
web	O
server	B-Operating_System
farms	I-Operating_System
,	O
home	B-Application
directories	I-Application
and	O
big	B-Application
data	I-Application
applications	O
.	O
</s>
<s>
Amazon	B-Application
EFS	O
provides	O
open-after-close	O
consistency	B-General_Concept
semantics	O
that	O
applications	O
expect	O
from	O
NFS	O
.	O
</s>
<s>
Amazon	B-Application
EFS	O
is	O
available	O
in	O
all	O
the	O
public	O
AWS	B-Application
regions	O
at	O
least	O
since	O
December	O
2019	O
.	O
</s>
