<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
is	O
a	O
cloud	B-Architecture
computing	I-Architecture
platform	I-Architecture
based	O
on	O
the	O
Xen	B-Operating_System
virtualization	O
platform	O
by	O
Nashik	O
,	O
Maharashtra-based	O
ESDS	O
Software	O
Solution	O
Pvt	O
.	O
</s>
<s>
It	O
allows	O
a	O
hosted	O
virtual	B-Architecture
machine	I-Architecture
(	O
VM	O
)	O
to	O
scale	O
resources	O
such	O
as	O
CPU	O
and	O
RAM	O
automatically	O
in	O
real	O
time	O
.	O
</s>
<s>
According	O
to	O
ESDS	O
,	O
eNlight	B-General_Concept
Cloud	I-General_Concept
scales	O
computing	O
resources	O
such	O
as	O
RAM	O
and	O
CPU	O
automatically	O
without	O
requiring	O
a	O
reboot	O
or	O
causing	O
downtime	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
allows	O
a	O
user	O
to	O
rent	O
virtual	B-Architecture
machines	I-Architecture
that	O
can	O
be	O
created	O
,	O
modified	O
and	O
terminated	O
using	O
the	O
management	O
panel	O
,	O
as	O
required	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
was	O
launched	O
on	O
21	O
November	O
2011	O
by	O
former	O
captain	O
of	O
the	O
Indian	O
cricket	O
team	O
and	O
Chairman	O
of	O
the	O
Selection	O
Committee	O
,	O
Kris	O
Srikkanth	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
provides	O
public	O
,	O
private	O
and	O
hybrid	O
models	O
of	O
cloud	O
deployment	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
comes	O
with	O
a	O
web-based	O
management	O
panel	O
,	O
a	O
type	O
of	O
control	B-Application
panel	I-Application
developed	O
using	O
the	O
PHP	B-Application
&	O
Python	B-Language
scripting	I-Language
language	I-Language
,	O
used	O
to	O
create	O
VMs	O
,	O
edit	O
VM	O
settings	O
,	O
start	O
,	O
shutdown	O
and	O
reboot	O
VMs	O
,	O
forecast	O
VM	O
bills	O
and	O
perform	O
critical	O
operations	O
.	O
</s>
<s>
Users	O
can	O
also	O
build	O
custom	O
application	O
templates	O
and	O
deploy	O
on	O
eNlight	B-General_Concept
Cloud	I-General_Concept
for	O
scalability	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
has	O
an	O
auto	O
scaling	O
feature	O
that	O
caters	O
to	O
sudden	O
or	O
erratic	O
resource	O
requirements	O
and	O
unpredictable	O
system	O
demands	O
.	O
</s>
<s>
eNlight	O
's	O
virtual	B-Architecture
platform	I-Architecture
scales	O
resources	O
dynamically	O
depending	O
on	O
the	O
usage	O
pattern	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
does	O
support	O
horizontal	O
scaling	O
options	O
too	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
works	O
on	O
a	O
pay	O
per	O
consume	O
billing	O
model	O
and	O
charges	O
users	O
on	O
the	O
resources	O
that	O
are	O
used	O
out	O
of	O
the	O
total	O
resources	O
that	O
may	O
be	O
allocated	O
to	O
a	O
particular	O
VM	O
.	O
</s>
<s>
eNlight	O
is	O
the	O
first	O
cloud	O
platform	O
where	O
the	O
billing	O
system	O
is	O
based	O
on	O
the	O
real	O
time	O
resource	O
usage	O
,	O
as	O
opposed	O
to	O
the	O
resources	O
allocated	O
to	O
the	O
virtual	B-Architecture
machine	I-Architecture
.	O
</s>
<s>
During	O
the	O
period	O
when	O
a	O
VM	O
is	O
inactive	O
,	O
eNlight	B-General_Concept
Cloud	I-General_Concept
users	O
are	O
not	O
charged	O
for	O
the	O
resources	O
that	O
may	O
be	O
used	O
.	O
</s>
<s>
eNlight	B-General_Concept
Cloud	I-General_Concept
supports	O
Windows	O
Server	O
as	O
well	O
as	O
Linux	B-Application
distributions	O
such	O
as	O
CentOS	O
.	O
</s>
<s>
However	O
,	O
vertical	O
auto	O
scaling	O
is	O
only	O
supported	O
on	O
certain	O
operating	O
systems	O
such	O
as	O
Windows	B-Device
Server	I-Device
2008	I-Device
,	O
2012	O
,	O
2016	O
(	O
Standard	O
and	O
Datacenter	O
Editions	O
)	O
and	O
Linux	B-Application
distributions	O
including	O
CentOS	O
,	O
Red	O
Hat	O
Enterprise	O
Linux	B-Application
,	O
SUSE	O
Linux	B-Application
,	O
Ubuntu	B-Operating_System
,	O
Fedora	O
,	O
Debian	O
and	O
Oracle	O
Linux	B-Application
.	O
</s>
<s>
Other	O
operating	O
systems	O
are	O
supported	O
without	O
scaling	O
options	O
,	O
such	O
as	O
Windows	B-Application
Server	I-Application
2003	I-Application
and	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
There	O
are	O
some	O
limitations	O
to	O
eNlight	B-General_Concept
Cloud	I-General_Concept
:	O
</s>
