<s>
QFS	B-Application
(	O
Quick	O
File	O
System	O
)	O
is	O
a	O
filesystem	O
from	O
Oracle	B-Application
.	O
</s>
<s>
It	O
is	O
tightly	O
integrated	O
with	O
SAM	O
,	O
the	O
Storage	O
and	O
Archive	O
Manager	O
,	O
and	O
hence	O
is	O
often	O
referred	O
to	O
as	O
SAM-QFS	B-Application
.	O
</s>
<s>
SAM	O
provides	O
the	O
functionality	O
of	O
a	O
hierarchical	B-Application
storage	I-Application
manager	I-Application
.	O
</s>
<s>
QFS	B-Application
supports	O
some	O
volume	O
management	O
capabilities	O
,	O
allowing	O
many	O
disks	O
to	O
be	O
grouped	O
together	O
into	O
a	O
file	O
system	O
.	O
</s>
<s>
SAM	O
extends	O
the	O
QFS	B-Application
file	O
system	O
transparently	O
to	O
archival	O
storage	O
.	O
</s>
<s>
A	O
SAM-QFS	B-Application
file	O
system	O
may	O
have	O
a	O
relatively	O
small	O
(	O
gigabytes	O
to	O
terabytes	O
)	O
"	O
disk	O
cache	O
"	O
backed	O
by	O
petabytes	O
of	O
tape	O
or	O
other	O
bulk	O
storage	O
.	O
</s>
<s>
SAM-QFS	B-Application
supports	O
up	O
to	O
four	O
archival	O
copies	O
,	O
each	O
of	O
which	O
can	O
be	O
on	O
disk	O
,	O
tape	O
,	O
optical	O
media	O
,	O
or	O
may	O
be	O
stored	O
at	O
a	O
remote	O
site	O
also	O
running	O
SAM-QFS	B-Application
.	O
</s>
<s>
Shared	O
QFS	B-Application
adds	O
a	O
multi-writer	O
global	O
filesystem	O
,	O
allowing	O
multiple	O
machines	O
to	O
read	O
from	O
&	O
write	O
to	O
the	O
same	O
disks	O
concurrently	O
through	O
the	O
use	O
of	O
multi-ported	O
disks	O
or	O
a	O
storage	O
area	O
network	O
.	O
</s>
<s>
(	O
QFS	B-Application
also	O
has	O
a	O
single-writer/multi	O
-reader	O
mode	O
which	O
can	O
be	O
used	O
to	O
share	O
disks	O
between	O
hosts	O
without	O
the	O
need	O
for	O
a	O
network	O
connection	O
.	O
)	O
</s>
<s>
SAM-QFS	B-Application
was	O
designed	O
and	O
implemented	O
at	O
Large	O
Storage	O
Systems	O
(	O
LSC	O
)	O
.	O
</s>
<s>
The	O
lead	O
architect	O
of	O
SAM-QFS	B-Application
was	O
Harriet	O
Coverston	O
,	O
the	O
founder	O
and	O
VP	O
of	O
Technology	O
at	O
LSC	O
.	O
</s>
<s>
LSC	O
and	O
SAM-QFS	B-Application
were	O
purchased	O
by	O
Sun	O
in	O
2001	O
.	O
</s>
<s>
Sun	O
released	O
the	O
SAM-QFS	B-Application
source	O
code	O
to	O
the	O
OpenSolaris	B-Operating_System
project	O
in	O
March	O
2008	O
.	O
</s>
<s>
After	O
Oracle	B-Application
acquired	O
Sun	O
,	O
Oracle	B-Application
continued	O
to	O
develop	O
the	O
SAM-QFS	B-Application
product	O
.	O
</s>
<s>
Later	O
Oracle	B-Application
renamed	O
SAM-QFS	B-Application
to	O
Oracle	B-Application
HSM	O
(	O
Oracle	B-Application
Hierarchical	B-Application
Storage	I-Application
Manager	I-Application
)	O
.	O
</s>
<s>
In	O
2014	O
Versity	O
,	O
a	O
storage	O
startup	O
co-founded	O
by	O
SAM-QFS	B-Application
lead	O
architect	O
Coverston	O
,	O
released	O
the	O
Versity	O
Storage	O
Manager	O
(	O
VSM	O
)	O
,	O
a	O
Linux-based	O
HSM	O
based	O
on	O
the	O
SAM-QFS	B-Application
code	O
.	O
</s>
<s>
oracle	B-Application
announced	O
2019	O
the	O
end	O
of	O
life	O
to	O
2021	O
,	O
Versity	O
shows	O
an	O
migration	O
path	O
.	O
</s>
