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Date: Sun, 12 Apr 1998 00:06:01 +0900
From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
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$B2<@n$G$9(B.

$BCY$/$J$j$^$7$?$,(B, $BBh(B1$B9F$r$*Aw$j$7$^$9(B.
$BJQ$J$H$3$m$,$"$C$?$i;XE&$7$/$@$5$$(B.
$B$h$m$7$/$*4j$$$7$^$9(B.

/\ Hidetoshi Shimokawa
\/  simokawa@sat.t.u-tokyo.ac.jp
PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp


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Title: FreeBSD$B$GF0$/(BCoda$B%U%!%$%k%7%9%F%`(B
Title: Coda on FreeBSD
Author: M. Satyanarayanan
        School of Computer Science
        Carnegie Mellon University

Coda$B%U%!%$%k%7%9%F%`$,(BFreeBSD 2.2.5, 2.2.6$B$GMxMQ$G$-$k$h$&$K$J$C$?(B
$B$3$H$r(BFreeBSD$B%3%_%e%K%F%#$N3'MM$K4n$S$r$b$C$F$*CN$i$;$7$^$9(B.
$B$3$N:G@hC<$NJ,;6%U%!%$%k%7%9%F%`$O%=!<%9%3!<%I$N>uBV$G<+M3$KMxMQ$G$-(B
$B$N$G(B, $BK\3JE*$J%f!<%6$d3+H/<T$r0z$-IU$1(B, $B$3$N%7%9%F%`$,(B
$BB?J}LL$K3HD%$5$l$k$3$H$,2f!9$N4j$$$G$9(B.
Coda$B$O(BNetBSD$B$d(BLinux$B>e$G$bF0$/$N$G(B, $B$d$,$F(BCoda$B$,%U%j!<(BUNIX$B$,A*Br$9(B
$B$kJ,;6%U%!%$%k%7%9%F%`$H$J$k$3$H$r4j$C$F$$$^$9(B.

We  are  pleased  to  inform  the FreeBSD community that the Coda File
System is now available for FreeBSD 2.2.5 and 2.2.6.  Our hope is that
the free availability of this state-of-the-art distributed file system
in source code form will attract serious users  and  developers  whose
talents  will  enhance  the  system along many dimensions.  Since Coda
also runs on NetBSD and Linux, we hope that over time it  will  become
the distributed file system of choice for free Unix platforms.

Coda$B$OB?=E2=$H%b%P%$%k%3%s%T%e!<%F%#%s%0$K4X$9$k8&5f$N%F%9%H%Y%C(B
$B%H$H$7$F%+!<%M%.%a%m%sBg3X$G3+H/$5$l$?J,;6%U%!%$%k%7%9%F%`$G$9(B.
Coda$B$O(B, Andrew File System(AFS)$B$N;RB9$H$7$F(B, AFS$B$,Bg5,LO$JJ,;6%U%!(B
$B%$%k%7%9%F%`$H$7$F?M5$$r=8$a$F$$$k(B, $BB?$/$N<gMW$JFCD'$r<u$1$D$$$G(B
$B$$$^$9(B. $BNc$($O(B, trusted$B$J%5!<%P$H(Buntrasted$B$J%/%i%$%"%s%H$N%b%G%k(B, 
$B0LCV$K4X$9$kF)2a@-$,$"$j%5!<%P$N6hJL$,ITMW(B, $B%U%!%$%kA4BN$r%G%#%9(B
$B%/>e$K%-%c%C%7%e$7$?$j(B, $B%P%C%U%!%-%c%C%7%e$K%V%m%C%/%l%Y%k$G$N%-%c%C(B
$B%7%e$r9T$J$&$J$I$N%/%i%$%"%s%HB&$G$N@Q6KE*$J%-%c%C%7%s%0(B, $B%G!<%?(B
$B$rO@M}E*$J%\%j%e!<%`$N=8$^$j$G9=@.$9$k$3$H$K$h$C$F(B, $BMF0W$J%7%9%F(B
$B%`4IM}$r<B8=(B, $BJ]8n$N$?$a$N%"%/%;%9%j%9%H!&%b%G%k(B, $B%f!<%6%l%Y%k$G(B
$B$N<BAu$r$a$6$7(B, $B%5!<%P$NA4BN$H(B, $B%/%i%$%"%s%H$N$4$/0lItJ,$r=|$$$?(B
$B$[$H$s$I$NItJ,$r%+!<%M%k$N30$KCV$/(B, $B$J$I$G$9(B.

Coda  is  a  distributed  file  system  developed  at  Carnegie Mellon
University as a test  bed  for  research  in  replication  and  mobile
computing.    As  a  descendant  of  the  Andrew File System (AFS), it
inherits many  of  the  key  features  that  make  AFS  attractive  in
large-scale  distributed environments.  These include: a client-server
model  with  trusted   servers   and   untrusted   clients;   location
transparency,   so  that  server  identities  are  completely  hidden;
aggressive on-disk whole-file client caching, with a further level  of
block-level  caching  in  the  buffer cache; organization of data into
logical  volumes  for  purposes  of  easy  system  administration;  an
access-list  model  of  protection;  and  a  user-level implementation
strategy that keeps the entire server and all but a tiny  fraction  of
the client out of the kernel.

$B$=$l$i$K2C$($F(B, Coda$B$O<!@$Be$NM-@~(B, $BL5@~4D6-$N$?$a$KFH<+$N5!G=(B
$B$rDs6!$7$F$$$^$9(B. $BNc$($P(B, $B8N0U$dM=4|$;$L%M%C%H%o!<%/$+$i$N@ZCG>u(B
$B67$G$N%*%Z%l!<%7%g%s$r;Y1g(B(hoarding($B%-%c%C%7%e$X$N$?$a$3(B
$B$_(B), reintegration($B:FE}9g(B),conflict-detection($BL7=b8!=P(B)$B$J$I(B),
$B%b%G%`$+$i(BLAN$B$N%9%T!<%I$^$G(B, network$B$N<A$KF0E*$KE,1~$7$?(B,
$BDcIJ<A$N%M%C%H%o!<%/$G$N%*%Z%l!<%7%g%s$N;Y1g(B,
$BF)2aE*$+$D3Z4QE*$JFI$_=q$-2DG=$J%5!<%P$NJ#@=(B,
$BD>@\E*$"$k$$$O(B, $B%"%W%j%1!<%7%g%s$4$H$N(Bconflict($BL7=b(B)$B2r>C$N;Y1g(B.
$B7W2h$5$l$F$$$k(BCoda$B$N5!G=3HD%$H$7$F$O(B, $B@-G=2~A1$N$?$a$N(B
$B%i%$%H%P%C%/%-%c%C%7%e(B, Kerberos $B$K$h$kG'>Z$NE}9g$J$I$G$9(B.
$B%^%$%/%m%=%U%H$N<!4|(BNT 5.0$B$N%U%!%$%k%7%9%F%`$N9=@.MWAG$G$"$k(B
IntelliMirror$B$O(B, Coda$B$N@ZCG;~%*%Z%l!<%7%g%s$N5!G=$+$iCeA[$rF@$?$b$N$G$9(B.


In   addition,  Coda  provides  many  unique  capabilities  for  next-
generation wired and wireless environments.   These  include:  support
for   voluntary  and  involuntary  disconnected  operation  (including
hoarding,  reintegration,   and   conflict-detection);   support   for
weakly-connected  operation with dynamic adaptation to network quality
ranging from  modem  speeds  to  LAN  speeds;  transparent  optimistic
read-write  server  replication  of  data,  with support for directory
resolution and  application-specific  conflict  resolution.    Planned
enhancements   to   Coda   include  write-back  caching  for  improved
performance while strongly-connected, and  integration  with  Kerberos
authentication.    The  disconnected  operation capability of Coda has
served  as  the  inspiration  for  the  IntelliMirror   component   of
Microsoft's forthcoming NT 5.0 file system.

FreeBSD$B%3%_%e%K%F%#$N3'$5$s(B, $B%U%j!<(BUNIX$B$N%3%_%e%K%F%#$N$?$a$K(B,
$B2f!9$H6&$K(BCoda$B$r8=>u$N<B83E*%W%m%H%?%$%W$+$i(B, 
$B9bIJ<A$G$9$0$l$?@_7W$N%7%9%F%`$X$HH/E8$5$;$^$7$g$&(B.
$B$3$N:n6H$NCf?4?MJ*$O(B Peter Braam (braam@cs.cmu.edu)$B$G$9(B.
$BH`$O(B, $B%+!<%M%.!<%a%m%s$N(BCoda$B%W%m%8%'%/%H$N>e5i8&5f0w$G$9(B.
$BB>$K(B,  Bob Baron, Henry  Pierce,  Robert  Watson, Jan  Harkes $B$J$I$,(B
$B%+!<%M%.!<%a%m%s$G$3$N:n6H$K;22C$7$F$$$^$9(B.
$B2?G/$K$b$o$?$k(BCoda$B$NH/E8$K9W8%$7$??M!9$NA4%j%9%H$OD9$9$.$F(B,
$B$3$3$K$O=q$1$^$;$s(B.

We  invite  the FreeBSD community to join us in transforming Coda from
the  experimental  prototype  that  it  is  now  to  a   high-quality,
well-engineered  system  for  the  free  Unix  community.   The person
leading this  effort  is  Peter  Braam  (braam@cs.cmu.edu),  a  senior
researcher  in  the  Coda  project  at  Carnegie Mellon.  Other people
currently involved in this work at Carnegie Mellon include Bob  Baron,
Henry  Pierce,  Robert  Watson,  and  Jan  Harkes.    The full cast of
contributors to Coda over its multi-year evolution is too long to list
here.

$B$h$j>\$7$$$3$H$O(B, Coda$B$N%&%'%V%Z!<%8(B www.coda.cs.cmu.edu $B$r8fMw$/$@$5$$(B.
Coda$B$K$h$C$F$b$?$i$5$l$?(B, $B8&5fO@J8$dGn;NO@J8$r<j$K$$$l$k$K$O(B,
"papers" $B$N%j%s%/$r$?$I$C$F$/$@$5$$(B. Coda$B$,$I$N$h$&$J6-3&NN0hE*$J(B
$B8&5f$NN.$l$G3+H/$5$l$F$$$k$+$rCN$k$K$O(B, "Coda project" $B$N%j%s%/(B
$B$r8fMw$/$@$5$$(B.

For  further  details, visit the Coda Web page at www.coda.cs.cmu.edu.
To obtain research papers and PhD theses generated by Coda, follow the
"papers"  link.    To learn more about the broader research context in
which Coda is being developed, follow the "Coda project" link.

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