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From YouTube: Run ZFS in Userland by Ping Huang
Description
From the 2022 OpenZFS Developer Summit: https://openzfs.org/wiki/OpenZFS_Developer_Summit_2022
Slides: https://docs.google.com/presentation/d/1JLfUFyVwHUZ0Qay3L8nYRmW2MtlNiE7YpqzPNXzNXBI/edit?usp=sharing
A
My
name
is
I,
am
a
software
engineer
from
LMS
a
Camden
China,
focusing
on
building
cognitive
storage
system
for
stage
four
applications
and
I'm
working
on
distributed
storage
system
and
for
several
years
and
actually
I
was
involved
in
cfx
just
a
few
months
ago,
when
we
were
seeking
for
a
user
and
the
fair
assistant
that
could
run
entertainment
so
actually
I'm
pretty
new
to
this
competitive
fashion,
so
feel
free
to
correct
me.
If
I
had
any
mistake
in
this
part.
A
Okay,
here
is
the
outline
of
this
talk
for
the
convenience
and
we
use
the
word
use
their
best,
indicating
around
JFS
in
New
Zealand.
So,
firstly,
we'll
talk
about
the
motivation.
White
is
the
first
and
then
we
take
a
look
at
the
existing
relation.
Will
work
on
that
and
then
we'll
move
on
our
annotation
and
to
see
how
our
work
is
different.
Are
we
the
existing
works?
A
The
first
point
is
that
we
love
their
best
because
of
many
nice
Futures.
The
best
provides
such
as
capital,
red
transaction
model,
food
storage,
a
snapshot
and
so
on.
So
even
when
JFS
is
not
native
in
most
Linux
distributions,
but
in
the
materialization
era
the
end
user,
they
they
are
able
to
install
CFS
current
volume
in
them
manually
because
their
work
clothes
around
in
the
video.
A
A
A
Look
at
this
diagram
actually
in
the
middle
is
the
Linux
kind
of
VFX
and
the
core
logic
of
the
effects
is
under
real
best
actually
same
as
a
brand
new
injection
mode,
and
that
has
also
provide
some
libraries
and
some
of
Monday
utilities
to
do
the
management
work
like
the
J2
or
gender
as
tool.
They
call
apis
provided
by
the
lead
VFS
for
like
creating
or
destroying
or
CFS,
and
this
Library
talks
to
the
deaf
as
kindergarten
throughout.
A
A
A
A
A
Such
as
the
entry
analog
fire
super
block
and
even
klcb
send
that
back,
I'm
throwing
it
out.
Each
layer
is
coupled
with
Colonel
deeply
and
it
is
pretty
difficult
to
put
into
music
where
the
low
level
layer
actually
had
a
similar
interfaces
with
the
hello.
But
it
is
fascinated
with
most
of
the
technology
attack.
I
said
it
used
the
low
level
structure,
that's
defined
by
ZFS
itself,
and
we
will
take
an
example
in
next
line
and
and
actually
the
real
work
of
the
VFS
of
operations
right
down
in
in
this
layer.
A
A
This
kind
of
files
into
you,
like
OS,
specific
and
some
common
functionality,
and
for
this
common
of
our
factors
they
they
are
not
involved.
They
don't
involve
the
that
the
kernelix
side,
so
this
this,
these
files
are
pretty
easy
to
put
into
using
it
doesn't
make
your
work
is
to
continually
these
otherwise
specific
buyers
into
the
user.
A
Okay,
so
here
is
the
example
to
show
the
high
level
and
the
low
level
apis
in
Japan.
The
the
operation
is
made
catchy
and
on
this
one
CPL
underscore
make
Direction.
This
is
actually
a
high
level
exam,
and
it
it
just
implements
the
VFS.
Let's
go
back
thus
is
used
this
kind
of
the
structures
at
the
of
their
periotics.
A
And
DFS
underscore
Nick
judge
is
actually
low
level
API
and
it
used
like
daily
note
or
or
adjusting
as
the
parameters
and
the
high
level
CPL
underscore
make
make
a
direction
is:
firstly,
translate
this
high
note
to
denote
a
digit
to
the
chasing,
and
then
it
will
hold
their
best
and
school
make
you
actually
could
do
the
real
work
and
and
the
level
at
here
we
are
English
like
this.
This
kind
of
function
functions,
that's
provided
by
the
CFS
code.
Point.
A
A
A
A
But
surprising
that
we
can
retrieve
the
current
kind
of
code
and
add
minimum
new
codes
for
right,
but
the
currency
is
that
there
will
be
many
if
the
farm
are
in
the
promo
code
and
actually
currently
we
give
the
option
two.
But
I
think
this
may
need
to
be
discussed
further
like
if,
if
we
it
could
reflection
the
country
to
get
a
code,
that
it
made
videos
a
more
generic
way
to
call
the
platform
specific
logic.
A
They
ask
according
to
kill
into
little
food.
We
also
provide
a
separate
Library
named
ucfs,
but
which
provides
apis
for
article
to
use,
and
this
cannot
be
API.
It
is
actually
just
a
record
and
making
it
very
easy
to
integrate
and
a
player
so
take
the
make
direction.
For
example,
like
the
fsid
refers
to
a
data
set
and
d,
I
d
a
number
refers
to
the
direction
and
I
know
number,
and
the
name
is
the
internet
and
the
new
creative
anode
number
is
stored
in
the
last
items.
A
A
A
And
so,
regarding
at
this,
the
JF
skills
are
currently
we
support
supported
this.
These
operations
they
actually
they
are
no
really
basic
operations
for
metadata
and
for
for
Io
a
limitation
now
I
don't
need
that
the
management
is
not
spoil
again,
so
we
cannot
do
next
set
property
or
get
property
thing,
and
we
we
still
cannot
do
the
create
article
or
destroy
things.
Are
black.
A
A
And
the
term
I
mean
the
ucfs.
We
also
let
our
deep
cool
and
see
the
first
two
update
into
elliptical
so
that
we
can
do
the
basic
management
operation
such
as
I've
created
or
disjointed
equality
effects
and
I.
Guess
that's
the
property,
but
the
limitation
is
that
if
you
use
a
theater
skills,
you
cannot
do
this
kind
of
thing
when
the
data
set
is
mounted
support
again.
A
Okay,
so
here
is
the
performance
data
we
can't
have,
and
what
one
thing
I
want
to
exercise
is
that,
since
currently
we
are
still
working
on
working
on
the
functionality
side,
so
we
haven't
done
any
close
tuning
work.
Yet
so
this
data-
and
not
that
metaphor,
except
for
just
any
case,
the
the
current
Baseline
of
the
ucfs.
A
So,
okay
The
Meta
operation,
apis,
we
tested
three
scenarios
with
empty
text,
the
kernel
to
their
best.
If
you
depth
tool
and
ZFS
fuse
and
the
operations
is
the
directory
credit,
States
removed
and
and
the
operations
for
crazy,
State
Fair
and
remove
fat
well
on
the
test,
it's
a
common
Denmark
for
assessment,
embedded
data.
We
just
used
one
sorry
and
a
fan
number
over.
This
number
is
one
minute
yeah
and-
and
we
in
this
case
we
jump
the
VFS
cache
before
age
operation
test.
A
A
Okay,
so
this
is
the
bandwidth
data
and
we
give
a
title
to
test
those
sequential
read
and
write,
or
on
just
one
file
and
the
different
skills
it
could
achieve
like
more
than
300
megabytes
per
second
for
screen
to
read
and
250,
first
official
rights
and
apparently
the
kernel
DFS.
It
still
has
a
big
degradation
there
and
the
reason
is
that
is
obviously
it
needs
affects
your
difficulty
between
internal
and
the
username.
A
A
And
the
third
one
is
you
using
FS
computer,
automated
distributed
data
system
typically
distributed
facility,
provide
the
ability,
which
means,
if
one
server
has,
the
story
should
be
refused
quickly
to
provide
service
well
different.
Certain
needs
fck
as
power
adage,
which
is
a
very
a
key
feature
in
this
scenario.
A
A
A
Here
is
our
activated
level
on
guitar
and
currently
the
basic
expense
of
operations
in
IO
works.
There
are
still
a
lot
of
work
to
do
here.
The
feed
correct
the
first
way
that
we
we
will
create
PR
to
the
app
screen
app
to
set
up
some
more
reflection
code
work
for
first
discussion,
such
as
how
to
organize
the
the
code
for
the
UK.
A
A
A
A
A
A
B
B
B
A
And
but
but
actually
the
the
core
functionality
is
the
negative
user
effects
that
you
can
do
more
development
to
integrate
that
Library
into
you
know
different
sterility
systems
like
we,
we
just
indicate
it
to
into
the
fields
so
that
you
can
have
the
fuse
functionality.
You
can
also
integrate
with
the
condition
like
a
server,
so
you
can
actually
build
the
finished
another
server
there
and,
and
actually
the
MX
server
is
also
around
the
server
or
epidemic.
D
The
web
use
EFS
API
that
you're,
using
with
fuse,
is
stateless
where,
instead
of
having
Point
groups
to
structures
like
a
data
set
or
whatever
you're
using
human
60
QT,
and
that
doesn't
really
surprised
me,
this
degree
performance
because
you're
going
to
have
to
look
up
the
data
set
from
some
structure
or
whatever
every
single
time
you
do
an
operation.
Why
did
you
go
for
that
design,
choice.
A
A
So
we
here,
actually
we
don't
have.
You
know
a
particular
explanation
on
that,
because
one
thing
that
when
we
built
like
a
distribution,
I,
think
it's
liberty
has
the
limitation
on
the
back
application
of
the
effects
you
can
create
it
and,
but
you
know
maybe
302
you
you're
in
32
is
also
but
right
now.
Actually
we
don't
have.
You
know
a
special
situation
on
that.
We
would
just
like
what
it's
effects
that
are
used.
A
F
D
Yes,
like
the
VFS,
like
the
original
DFS
use
implementation
as
a
friend
there's
something
called
narrative
life's
new
space
where
you
could
implementary
article
interface
with
the
exceptions
I'm
just
curious.
Why
did
you
decide
to
use
a
pipe
over
ingredients
in
uspace
using
a
tablet
device
in
user
space.
A
Did
you
ask
the
the
control
class
of
the
Jetta
fields
Monument,
because
I
I
know
that
there
is
a
like
a
c
c
c?
U
s
e,
which
exports
a
character
director
device
so
that
you
can
talk
that
capture
device
for
the
future
parts
and
a
young.
Currently
we
we
have
it
because
we
haven't
supported
that
with
your
pants.
So
we
we
don't
use
that
right
now,
but
when
we,
if
we
need
to
support
that
culture
packs.