<s>
The	O
Cloud	B-General_Concept
Data	I-General_Concept
Management	I-General_Concept
Interface	I-General_Concept
(	O
CDMI	B-General_Concept
)	O
is	O
a	O
SNIA	O
standard	O
that	O
specifies	O
a	O
protocol	O
for	O
self-provisioning	O
,	O
administering	O
and	O
accessing	O
cloud	O
storage	O
.	O
</s>
<s>
CDMI	B-General_Concept
defines	O
RESTful	O
HTTP	B-Protocol
operations	O
for	O
assessing	O
the	O
capabilities	O
of	O
the	O
cloud	O
storage	O
system	O
,	O
allocating	O
and	O
accessing	O
containers	O
and	O
objects	O
,	O
managing	O
users	O
and	O
groups	O
,	O
implementing	O
access	O
control	O
,	O
attaching	O
metadata	O
,	O
making	O
arbitrary	O
queries	O
,	O
using	O
persistent	O
queues	O
,	O
specifying	O
retention	O
intervals	O
and	O
holds	O
for	O
compliance	O
purposes	O
,	O
using	O
a	O
logging	O
facility	O
,	O
billing	O
,	O
moving	O
data	O
between	O
cloud	O
systems	O
,	O
and	O
exporting	O
data	O
via	O
other	O
protocols	O
such	O
as	O
iSCSI	B-Protocol
and	O
NFS	B-Protocol
.	O
</s>
<s>
Transport	O
security	O
is	O
obtained	O
via	O
TLS	B-Protocol
.	O
</s>
<s>
A	O
CDMI	B-General_Concept
client	O
may	O
access	O
objects	O
,	O
including	O
containers	O
,	O
by	O
either	O
name	O
or	O
object	O
id	O
(	O
OID	O
)	O
,	O
assuming	O
the	O
CDMI	B-General_Concept
server	O
supports	O
both	O
methods	O
.	O
</s>
<s>
When	O
accessed	O
by	O
name	O
,	O
clients	O
use	O
URLs	O
that	O
contain	O
the	O
full	O
pathname	O
of	O
objects	O
to	O
create	B-General_Concept
,	I-General_Concept
read	I-General_Concept
,	I-General_Concept
update	I-General_Concept
and	I-General_Concept
delete	I-General_Concept
them	O
.	O
</s>
<s>
When	O
accessed	O
by	O
OID	O
,	O
the	O
URL	O
specifies	O
an	O
OID	O
string	O
in	O
the	O
cdmi-objectid	O
container	O
;	O
this	O
container	O
presents	O
a	O
flat	O
name	O
space	O
conformant	O
with	O
standard	O
object	O
storage	O
system	O
semantics	O
.	O
</s>
<s>
CDMI	B-General_Concept
supports	O
the	O
concept	O
of	O
a	O
domain	O
,	O
similar	O
in	O
concept	O
to	O
a	O
domain	O
in	O
the	O
Windows	O
Active	B-Protocol
Directory	I-Protocol
model	O
.	O
</s>
<s>
CDMI	B-General_Concept
exactly	O
follows	O
the	O
ACL	O
and	O
ACE	O
model	O
used	O
for	O
file	O
authorization	O
operations	O
by	O
NFSv4	O
.	O
</s>
<s>
This	O
makes	O
it	O
also	O
compatible	O
with	O
Microsoft	B-Application
Windows	I-Application
systems	O
.	O
</s>
<s>
CDMI	B-General_Concept
draws	O
much	O
of	O
its	O
metadata	O
model	O
from	O
the	O
XAM	B-General_Concept
specification	O
.	O
</s>
<s>
CDMI	B-General_Concept
specifies	O
a	O
way	O
for	O
systems	O
to	O
support	O
arbitrary	O
queries	O
against	O
CDMI	B-General_Concept
containers	O
,	O
with	O
a	O
rich	O
set	O
of	O
comparison	O
operators	O
,	O
including	O
support	O
for	O
regular	B-Language
expressions	I-Language
.	O
</s>
<s>
CDMI	B-General_Concept
supports	O
the	O
concept	O
of	O
persistent	O
FIFO	B-Operating_System
(	O
first-in	B-Operating_System
,	I-Operating_System
first-out	I-Operating_System
)	O
queues	O
.	O
</s>
<s>
Both	O
retention	O
intervals	O
and	O
retention	O
holds	O
are	O
supported	O
by	O
CDMI	B-General_Concept
.	O
</s>
<s>
CDMI	B-General_Concept
clients	O
can	O
sign	O
up	O
for	O
logging	O
of	O
system	O
,	O
security	O
and	O
object	O
access	O
events	O
on	O
servers	O
that	O
support	O
it	O
.	O
</s>
<s>
CDMI	B-General_Concept
supports	O
export	O
of	O
containers	O
as	O
NFS	B-Protocol
or	O
CIFS	O
shares	O
.	O
</s>
<s>
Provisioning	O
of	O
iSCSI	B-Protocol
LUNs	O
is	O
also	O
supported	O
.	O
</s>
