Page 153 - slides.dvi

•
•
•
NT
–
–
–
⇒
⇒
–
–
–
–
–
Case
NT
∗
∗
if
if
so
no
Cache
viz.
NT
can
Cache
disk
disk
Study—
also
cache
lots
get
Completely
specify
specify
of
decouples
keeps
virtually
virtual
layout
unless
Executive
physically
FS
more
Manager
“lines”
&
translation
synchronously
provides
Manager
track
write
unified
all
cache
Functions
of
physical
cache
cluster
in
memory
some
live
caches
&
temporary
volume
absolutely
up
required
in
cache:
intelligent
complete.
cache
when
user
to
256K
through
for
the
attrib
virtual
manager
“virtual
VM
concept
64K.
necessary.
“lines”
attrib
cache
blocks,
when
control:
virtual
cache
as
prefetching
system
hit.
blocks”:
when
responsible
abstracted
creating
address
offsets
lightly
systems:
for
file
opening
away.
e.g.
a
within
⇒
space.
a
loaded,
actually
file
data
file
⇒
little
will
doing
all
rather
when
the
never
writes
than
I/O.
be
a
will
system
flushed
volume.
to
149
thrashing