<s>
oVirt	B-Language
is	O
a	O
free	B-License
,	I-License
open-source	I-License
virtualization	B-General_Concept
management	O
platform	O
.	O
</s>
<s>
It	O
was	O
founded	O
by	O
Red	O
Hat	O
as	O
a	O
community	O
project	O
on	O
which	O
Red	B-Application
Hat	I-Application
Virtualization	I-Application
is	O
based	O
.	O
</s>
<s>
It	O
allows	O
centralized	O
management	O
of	O
virtual	B-Architecture
machines	I-Architecture
,	O
compute	O
,	O
storage	O
and	O
networking	O
resources	O
,	O
from	O
an	O
easy-to-use	O
web-based	O
front-end	O
with	O
platform	B-Operating_System
independent	I-Operating_System
access	O
.	O
</s>
<s>
KVM	B-Application
on	O
x86-64	B-Device
,	O
PowerPC64	B-General_Concept
and	O
s390x	O
architecture	O
are	O
the	O
only	O
hypervisors	B-Operating_System
supported	O
,	O
but	O
there	O
is	O
an	O
ongoing	O
effort	O
to	O
support	O
ARM	B-Architecture
architecture	I-Architecture
in	O
a	O
future	O
releases	O
.	O
</s>
<s>
oVirt	B-Language
consists	O
of	O
two	O
basic	O
components	O
,	O
oVirt	B-Language
engine	O
and	O
oVirt	B-Language
node	O
.	O
</s>
<s>
The	O
oVirt	B-Language
engine	O
backend	O
is	O
written	O
in	O
Java	B-Language
,	O
while	O
the	O
frontend	O
is	O
developed	O
with	O
GWT	B-Language
web	O
toolkit	O
.	O
</s>
<s>
The	O
oVirt	B-Language
engine	O
runs	O
on	O
top	O
of	O
the	O
WildFly	B-Language
(	O
former	O
JBoss	B-Language
)	O
application	B-Application
server	I-Application
.	O
</s>
<s>
User	O
administration	O
can	O
be	O
managed	O
locally	O
or	O
by	O
integrating	O
oVirt	B-Language
with	O
LDAP	B-Protocol
or	O
AD	B-Protocol
services	O
.	O
</s>
<s>
The	O
oVirt	B-Language
engine	O
stores	O
data	O
in	O
a	O
PostgreSQL	B-Application
database	O
.	O
</s>
<s>
A	O
REST	B-Protocol
API	I-Protocol
is	O
available	O
for	O
customizing	O
or	O
adding	O
engine	O
features	O
.	O
</s>
<s>
An	O
oVirt	B-Language
node	O
is	O
a	O
server	B-Application
running	O
RHEL	O
,	O
CentOS	O
,	O
Scientific	B-Application
Linux	I-Application
,	O
or	O
experimentally	O
Debian	O
,	O
with	O
KVM	B-Application
hypervisor	B-Operating_System
enabled	O
and	O
a	O
VDSM	O
(	O
Virtual	O
Desktop	O
and	O
Server	B-Application
Manager	O
)	O
daemon	B-Operating_System
written	O
in	O
Python	B-Language
.	O
</s>
<s>
Management	O
of	O
resources	O
initiated	O
from	O
a	O
webadmin	O
portal	O
are	O
sent	O
through	O
the	O
engine	O
backend	O
that	O
issues	O
appropriate	O
calls	O
to	O
the	O
VDSM	O
daemon	B-Operating_System
.	O
</s>
<s>
VDSM	O
controls	O
all	O
resources	O
available	O
to	O
the	O
node	O
(	O
compute	O
,	O
storage	O
,	O
networking	O
)	O
and	O
virtual	B-Architecture
machines	I-Architecture
running	O
on	O
it	O
and	O
is	O
also	O
responsible	O
for	O
providing	O
feedback	O
to	O
the	O
engine	O
about	O
all	O
initiated	O
operations	O
.	O
</s>
<s>
Multiple	O
nodes	O
can	O
be	O
clustered	B-Architecture
from	O
the	O
oVirt	B-Language
engine	O
webadmin	O
portal	O
to	O
enhance	O
RAS	B-General_Concept
.	O
</s>
<s>
The	O
oVirt	B-Language
engine	O
can	O
be	O
installed	O
on	O
a	O
standalone	O
server	B-Application
,	O
or	O
can	O
be	O
hosted	O
on	O
a	O
cluster	O
of	O
nodes	O
themselves	O
inside	O
a	O
virtual	B-Architecture
machine	I-Architecture
(	O
self-hosted	O
engine	O
)	O
.	O
</s>
<s>
The	O
self-hosted	O
engine	O
can	O
be	O
manually	O
installed	O
or	O
automatically	O
deployed	O
via	O
a	O
virtual	B-Application
appliance	I-Application
.	O
</s>
<s>
oVirt	B-Language
is	O
built	O
upon	O
several	O
other	O
projects	O
including	O
libvirt	B-Language
,	O
Gluster	O
,	O
PatternFly	O
,	O
and	O
Ansible	B-Language
.	O
</s>
<s>
Virtual	O
datacenters	B-Operating_System
,	O
managed	O
by	O
oVirt	B-Language
,	O
are	O
categorized	O
into	O
storage	O
,	O
networking	O
and	O
clusters	O
that	O
consist	O
of	O
one	O
or	O
more	O
oVirt	B-Language
nodes	O
.	O
</s>
<s>
Data	O
integrity	O
is	O
ensured	O
by	O
fencing	B-Operating_System
,	O
with	O
agents	O
that	O
can	O
use	O
various	O
resources	O
such	O
as	O
baseboard	O
management	O
controllers	O
or	O
uninterruptible	O
power	O
supplies	O
.	O
</s>
<s>
Network	O
management	O
allows	O
defining	O
multiple	O
VLANs	B-General_Concept
that	O
can	O
be	O
bridged	B-Protocol
to	O
the	O
network	B-Protocol
interfaces	I-Protocol
available	O
on	O
the	O
nodes	O
.	O
</s>
<s>
Configuration	O
of	O
bonded	B-Protocol
interfaces	O
,	O
IP	B-Protocol
addresses	I-Protocol
,	O
subnet	B-Protocol
masks	I-Protocol
and	O
gateways	B-Application
on	O
managed	O
nodes	O
are	O
all	O
supported	O
within	O
webadmin	O
portal	O
interface	O
,	O
as	O
is	O
SR-IOV	B-Protocol
on	O
hardware	O
configurations	O
that	O
support	O
this	O
feature	O
.	O
</s>
<s>
Management	O
features	O
for	O
compute	O
resources	O
include	O
CPU	B-Operating_System
pinning	I-Operating_System
,	O
defining	O
NUMA	B-Operating_System
topology	O
,	O
enabling	O
kernel	B-Application
same-page	I-Application
merging	I-Application
,	O
memory	B-General_Concept
over-provisioning	I-General_Concept
,	O
HA	B-General_Concept
VM	O
reservation	O
etc	O
.	O
</s>
<s>
Virtual	B-Architecture
machine	I-Architecture
management	O
enables	O
selecting	O
high	O
availability	O
priority	O
,	O
live	O
migration	O
,	O
live	O
snapshots	B-Application
,	O
cloning	O
virtual	B-Architecture
machines	I-Architecture
from	O
snapshots	B-Application
,	O
creating	O
virtual	B-Architecture
machine	I-Architecture
templates	O
,	O
using	O
cloud-init	O
for	O
automated	O
configuration	O
during	O
provisioning	O
and	O
deployment	O
of	O
virtual	B-Architecture
machines	I-Architecture
.	O
</s>
<s>
Supported	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
include	O
Linux	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
and	O
FreeBSD	B-Operating_System
.	O
</s>
<s>
Access	O
to	O
virtual	B-Architecture
machines	I-Architecture
can	O
be	O
achieved	O
from	O
webadmin	O
portal	O
using	O
SPICE	B-Protocol
,	O
VNC	B-Protocol
and	O
RDP	B-Protocol
protocols	O
.	O
</s>
<s>
oVirt	B-Language
can	O
be	O
integrated	O
with	O
many	O
open	O
source	O
projects	O
,	O
including	O
OpenStack	B-Application
Glance	O
and	O
Neutron	O
for	O
disk	O
and	O
network	O
provisioning	O
,	O
Foreman/Katello	O
for	O
VM/node	O
provisioning	O
or	O
pulling	O
relevant	O
errata	O
information	O
into	O
webadmin	O
portal	O
and	O
can	O
be	O
further	O
integrated	O
with	O
ManageIQ	B-Application
for	O
a	O
complete	O
virtual	O
infrastructure	O
lifecycle	O
management	O
.	O
</s>
<s>
Disaster	B-General_Concept
recovery	I-General_Concept
features	O
include	O
the	O
ability	O
to	O
import	O
any	O
storage	O
domain	O
into	O
different	O
oVirt	B-Language
engine	O
instances	O
and	O
replication	B-Architecture
can	O
be	O
managed	O
from	O
oVirt	B-Language
with	O
GlusterFS	B-Application
geo-replication	B-General_Concept
feature	O
,	O
or	O
by	O
utilizing	O
synchronous/asynchronous	O
block	O
level	O
replication	B-Architecture
provided	O
by	O
storage	O
hardware	O
vendors	O
.	O
</s>
<s>
oVirt	B-Language
engine	O
backups	B-Protocol
can	O
be	O
automated	O
and	O
periodically	O
transferred	O
to	O
a	O
remote	O
location	O
.	O
</s>
<s>
oVirt	B-Language
supports	O
hyper-converged	B-Architecture
infrastructure	I-Architecture
deployment	O
scenarios	O
.	O
</s>
<s>
Self-hosted	O
engine	O
and	O
Gluster-based	O
storage	O
domains	O
allow	O
centralized	O
management	O
of	O
all	O
resources	O
that	O
can	O
be	O
seamlessly	O
expanded	O
,	O
simply	O
by	O
adding	O
an	O
appropriate	O
number	O
of	O
nodes	O
to	O
the	O
cluster	O
,	O
without	O
having	O
any	O
single	B-Architecture
points	I-Architecture
of	I-Architecture
failure	I-Architecture
.	O
</s>
<s>
oVirt	B-Language
provides	O
deep	O
integration	O
with	O
Gluster	O
,	O
including	O
Gluster	O
specific	O
performance	O
improvements	O
.	O
</s>
