<s>
geom_raid5	O
is	O
a	O
storage	O
module	O
created	O
for	O
the	O
FreeBSD	B-Operating_System
operating	O
system	O
.	O
</s>
<s>
Like	O
other	O
FreeBSD	B-Operating_System
storage	O
modules	O
,	O
geom_raid5	O
utilizes	O
the	O
GEOM	B-Application
framework	O
.	O
</s>
<s>
It	O
is	O
built	O
as	O
a	O
kernel	O
loadable	O
module	O
(	O
KLD	O
)	O
which	O
allows	O
it	O
to	O
run	O
inside	O
the	O
FreeBSD	B-Operating_System
kernel	O
.	O
</s>
<s>
The	O
module	O
can	O
be	O
compiled	O
on	O
FreeBSD	B-Operating_System
release	O
5	O
and	O
newer	O
releases	O
.	O
</s>
<s>
geom_raid5	O
is	O
also	O
incorporated	O
into	O
FreeNAS	B-Application
,	O
an	O
operating	O
system	O
dedicated	O
to	O
Network	B-Application
Attached	I-Application
Storage	I-Application
.	O
</s>
<s>
Its	O
author	O
,	O
Arne	O
Woerner	O
,	O
has	O
released	O
the	O
software	O
under	O
the	O
BSD	O
license	O
,	O
making	O
geom_raid5	O
OSI-compliant	O
open	B-Application
source	I-Application
software	I-Application
.	O
</s>
<s>
This	O
is	O
in	O
huge	O
contrast	O
with	O
other	O
software	O
RAID5	O
solutions	O
which	O
sometimes	O
achieve	O
less	O
than	O
10%	O
of	O
that	O
throughput	O
combined	O
with	O
significantly	O
higher	O
CPU	B-Device
utilization	O
.	O
</s>
<s>
But	O
using	O
request	O
combining	O
,	O
geom_raid5	O
manages	O
to	O
outperform	O
any	O
software	O
RAID5	O
solution	O
to	O
date	O
,	O
capable	O
of	O
reaching	O
write-speeds	O
associated	O
with	O
hardware	O
RAID5	O
on	O
budget-level	O
x86	B-Operating_System
hardware	O
.	O
</s>
<s>
In	O
particular	O
,	O
benchmarks	O
showing	O
geom_raid5	O
performance	O
versus	O
ZFS	B-Application
's	O
RAID-Z	O
are	O
long-awaited	O
by	O
users	O
.	O
</s>
<s>
Various	O
incarnations	O
of	O
geom	B-Application
raid5	I-Application
exist	O
which	O
trade	O
off	O
speed	O
for	O
memory	O
usage	O
.	O
</s>
