ก ก CODA ก ก ก ก. Mahadev Satyanarayanan ก ก ก ก ก ก

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1 ก ก CODA IPv6 ก ก ก ก ก CODA[3] ก ก ( Distributed File Systems )[1] ก ก ก Server (Disconnected Operation) ก ก ก IP version 6 ( IPv6 )[2] ก ก ก ก CODA IPv4[5] IPv6 ก ก ก ก ก ก ก ก ก ก client server IPv4 IPv6 ก CODA ก กก ก ก CODA ก IPv6 ก กก ก server ก IP address ก domain name IPv4 IPv6 กก RPC2[6] module ก client server ก domain name IPv6 Abstract Coda developed by the research group of M. Satyanarayanan at Carnegie Mellon University since It is a distributed file system providing flexibility to data server and network failures by using two essential methods -- disconnected operation and server replication. Nevertheless, Coda can recently be ported to many operating systems such as Linux, NetBSD, and FreeBSD etc. This notable file system is expected to become popular, widely used and full available for everyone. However Coda can be deployed on top of IPv4 networks which has been used for past twenty years and will be gradually replaced by IPv6 which can solve IPv4 address depletion. Our efforts are to port Coda to IPv6. This paper deeply represents how and where it is necessary Coda file system ก ก noppapadol@hotmail.com ก ก ก sukumal.i@ku.ac.th should be modified in order to support IPv6 and how Coda file system can be widely adopt in IPv6 world. CODA, IPv6, 1. ก ก ก ก ก ก ก ก ก ก ก กก ก ก ก ก ก ก กก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก ก File Server ก Mahadev Satyanarayanan ก ก Carnegie Mellon ก ก ก Coda (Coda File System) ก ก Server ก Disconnected Operation ก Server ก ก 167

กก ก ก CODA ก IPv6 ก กก ก server ก IP address ก domain name IPv4 IPv6 กก RPC2[6] module ก client server ก domain name IPv6 Abstract Coda developed by the research group of M.

2 ก ก กก ก ก ก ก ก ก ก Server Coda ก ก Server ก Coda ก ก ก (authentication) ก ก ก ก ก ก ก ก ก ก Server Client ก ก ก 2. IPv4 ก IP Address ก ก IP Address ก ก IPv6 Internet Protocol กก ก 128 ( IPv4 32 ) IPv4 ก ก Coda File System ก ก ก Coda ก ก ก ก ก ก IPv6 ก ก Coda ก IPv4 ก ก ก IPv6 Coda IPv6 ก 3. ก 3.1 Coda File System Coda[15] ก Carnegie Mellon University (CMU) 1990 ก ก UNIX-base Linux Coda ก ก ก server ก ก ก server ก client Coda ก Andrew (Andrew File Systems AFS[4]) ก ก ก ก ก server Vice SCM (the master coda server) ก ก ก ก client ก ก กก ก client ก Virtue workstations 1 ก Coda Vice file server xxxxxx SCM xxxxxx Virtue workstation 1 ก Coda Virtue workstation user-level process Venus ก ก Vice ก ก ก server ก ก ก ก ก directory /coda ก server clog ก 168

ก 3.1 Coda File System Coda[15] ก Carnegie Mellon University (CMU) 1990 ก ก UNIX-base Linux Coda ก ก ก server ก ก ก server ก client Coda ก Andrew (Andrew File Systems AFS[4]) ก ก ก ก ก

3 ก Read Only ก ก ก ก ก ก server RPC2 2 ก RPC2 Call RPC 1 Client Application Data in file Server Application 3 Client side Application protocol Server 3 effect side effect Client side effect Client side effect create RPC client stub 4 Application protocol Application protocol RPC protocol 2 Data in file Server side effect Server side effect Call RPC 2 ก RPC2 ก 2 ก ก RPC2 module ก ก ก ก ก server ก server ก ( Remote Procedure Call ) ก ก data type data structure clog ก ก ก RPC2 client ก server RPC Protocol ก ก ก 2 ก ก RPC2 client ก ก server ก side effect 3 side effect ก ก protocol ก ก RPC2 UDP side effect 2 ก protocol ก 4 ก side effect RPC2 multicast client ก Coda ก ก ก ก ก server server multicast ก ก client ก ก ก 1 create RPC server stub ก client ก server ก ก ก ก ก ก client ก server server client ก client ก server ก ก ก 4. ก ก IPv4 IPv6 Coda ก output ก Log File ก ก ก ก ( Debugger ) ก ก 4.1 Coda ก RVM[8], RPC2, LWP Coda ก ก Coda ก 2 client ก server ก Coda IPv6 ก ก ก ก ก ก Coda 3 RVM LWP Server side CODA - server RPC2 CODA - client RPC2 Client side 3 ก CODA RVM LWP 169

ก server ก ( Remote Procedure Call ) ก ก data type data structure clog ก ก ก RPC2 client ก server RPC Protocol ก ก ก 2 ก ก RPC2 client ก ก server ก side effect 3 side effect ก ก protocol ก ก RPC2 UDP

4 4.2 ก ก LWP Light-weight Process LWP Coda RPC2 ก ก Thread ก (concurrent) RVM Recoverable Virtual Machine RVM ก ก client ก RPC2 RPC[7] ก remote procedure call ก ก ก Server Client ก ก ก ก IP UDP Protocol RPC ก ก ก Server Client Andrew File System AFS Coda File System ก implement RPC RPC CODA ก CODA ก ก 2 ก Vice server ก ก ก ก ก Venus process client ก./usr/local/etc/.init start clog ก ก ก ก server ก update server กก ก ก ก CODA IPv6 ก ก ก ก server ก server server ก client clog client auth2.init update.init codasrv.init server ก ก ก ก ก server 5. ก ก 5.1 ก ก IPv6 กก IPv6 ก ก /etc/sysconfig/network /etc/sysconfig/network-scripts/ifcfg-eth0 ก ก ser network ser network restart ก dig resolve domain name ก DNS ก domain name กก ก IP address ก dig server.ipv6.net AAAA ( AAAA ก ก resolve IPv6 ) ก domain name server.ipv6.net AAAA IP Address 2002:9e6c:153a::1 ping6 ก IPv6 ก ก ก ping6 ก client server packet ก client server ping6 ก server server ก ping6 ก ping6 ก ก กก IPv6 IP Address ก ก domain name client server ก IP Address Tunnel 6 to 4 ( tun6to4) packet ก IPv6 IPv4 ก packet 170

init start clog ก ก ก ก server ก update server กก ก ก ก CODA IPv6 ก ก ก ก server ก server server ก client clog client auth2.init update.init codasrv.init server ก ก ก ก ก server 5. ก ก 5.1

5 ก ก tunnel packet ก Coda client directory /coda ก ก ก CODA ก ก ก ~]# cd /coda coda]# ls NOT_REALLY_CODA coda]# cd server.codomo.net -bash: cd: server.codomo.net: No such file or directory -setup domain name IPv6 server ก ก ก ก server ก IPv6 /]# -setup server.ipv6.net == Loading coda kernel module. /etc/sers already has new sers registered! Good. /etc/sers ready for Coda./usr/local/etc/.init start ก ก ก /]#./usr/local/etc/.init start Starting : /usr/coda/.cache/pid exists, already running?. done. [root@client /]# cd coda [root@client coda]# cd server.codomo.net [root@client server.codomo.net]# ls hello hello_v2 [root@client server.codomo.net]# vi hello <file still read only> ก ก ก ก clog ก ก clog ก ก [root@client /]# clog admin username: admin@server.ipv6.net Unable to resolve addresses for Coda auth2 servers in realm 'server.ipv6.net' Password: Invalid login (RPC2_FAIL (F)). [root@client /]# cd coda [root@client coda]# cd server.codomo.net/ [root@client server.codomo.net]# ls hello hello_v2 [root@client server.codomo.net]# vi hello <file still read only> ก login clog source code ก source code function U_GetAuthServers(auser.c) ก ก function getaddrinfo parameter structure addrinfo *hints ก addrinfo ก function addrinfo ก ai_family ก addrinfo IP protocol PF_INET PF_INET6 PF_UNSPEC ก IP protocol version 4 version 6 struct addrinfo *hints ก ก function GetRealmServers ai_family PF_INET addrinfo IPv4 ก ก ai_family PF_INET ก ก ก coda_getaddrinfo NULL ai_family PF_INET6 ก coda_getaddrinfo ก ก clog directory /coda directory domain name IPv4 IPv6 server directory domain name IPv6 link error IPv4 ก ก Client client clog ก ก ก server ก ก clog RPC2 ก bind client ก server 3 171

/etc/sers already has new sers registered! Good. /etc/sers ready for Coda./usr/local/etc/.init start ก ก ก [root@client /]#./usr/local/etc/.init start Starting : /usr/coda/.

6 RPC2_HOSTBYNAME RPC2_HOSTBYADDRINFO RPC2_HOSTBYINETADDR ก ก server IPv6 RPC2 2 RPC2_HOSTBYNAME RPC2_HOSTBYADDRINFO CODA ก RPC2_HOSTBYINETADDR RPC2_HOSTBYNAME IPV4 ก IPv6 ก ก ก RPC2 Layer RPC2_NOBINDING ก ก 6.2 ก ก Server Coda Server ก ViceGetVolumeLocation(IN VolumeId volid, OUT RPC2_BoundedBS HostPort); ก ก ก Client ก replicated volume กก client ก ก volume ก IPv4 hostname ก ก ก //db/servers hostname IPv4 IPv6 Vice Server ก HostEntry, ClientEntry HostAddress Server SCM Venus Request ก Client IPv6 ก ก กก RPC2_GetRequest resolve IPv6 filter Coda File Server ก ก 7. ก ก ก ก Rod Van Meter Jan Harkes ก ก ก ก IPv6 Coda Carnegie Mellon ก ก ก ก ก ก 8. ก [1] Silberschatz, Galvin (1994). Operating System concepts, chapter 17 Distributed file systems. Addison-Wesley Publishing Company. ISBN [2] RFC 1752 ( The Recommendation for the IP Next Generation Protocol [3] Andrew S. Tanenbaum, Maarten van Steen, Distributed Systems: Principles and Paradigms, page [4] Howard, J.H., Kazar, M.L., Nichols, S.G., Nichols, D.A., Satyanarayanan, M., Sidebotham, R.N., & West, M.J. (February 1988). "Scale and Performance in a Distributed File System". ACM Transactions on Computer Systems 6 (1): [5] RFC 791 ( : Internet Protocol [6] M. Satyanarayanan (Editor) Richard Draves, James Kistler, Anders Klemets, Qi Lu, Lily Mummert, David Nichols, Larry Raper, Gowthami Rajendran, Jonathan Rosenberg, Ellen Siegel, RPC2 User Guide and Reference Manual available at [7] RFC 1057 ( - Specifies version 1 of ONC RPC [8] Henry M. Mashburn, Mahadev Satyanarayanan, David Steere, Yui W. Lee, School of Computer Science, CMU, RVM: Recoverable Virtual Memory, Release html 172

2 ก ก Server Coda Server ก ViceGetVolumeLocation(IN VolumeId volid, OUT RPC2_BoundedBS HostPort); ก ก ก Client ก replicated volume กก client ก ก volume ก IPv4 hostname ก ก ก //db/servers hostname

1. DNS Primary zone DNS. user name : train password : p@ssw0rd (Computer name) clientxx (xx ก ก ). 27 www.kroonis.org

1. DNS Primary zone DNS. user name : train password : p@ssw0rd (Computer name) clientxx (xx ก ก ). 27 www.kroonis.org 1 DNS 1. DNS Primary zone DNS ก Vmware Windows 7 ก (Clients) ก Image Windows 7 Network NAT user name : train password : p@ssw0rd (Computer name) clientxx (xx ก ก ) ก DNS clientxx Server 192.168.1.38 Server