1993.1.26 SUBJECT: NFSÀÇ °³³ä DESCRIPTION: 0. NetworkÀ» °æÀ¯ÇÑ file Àü¼Û °æ·Î 0) remote machineÀÇ fileÀ» °¡Á® ¿Â´Ù. Local Machine | Network | Remote Machine | | +-----------+ +-----------+ | | +-----------+ +-----------+ | file Àü¼Û |¦¡¡æ | Network |¦¡¦¡¦¡¦¡¦¡¦¡¦¡¡æ | Network | ¦¡¡æ| file Àü¼Û |¦¡¦¡¦¤ | Client | | S/W | | | | S/W | | Server | ¡éDisk +-----------+ +-----------+ | | +-----------+ +-----------+ +-------+ | | | file | +-------+ | | +-----------+data +-----------+ | data | +-----------+data +-----------+ ¦£¦¡| file Àü¼Û |¡ç¦¡ | Network |¡ç¦¡¦¡¦¡¦¡¦¡¦¡¦¡ | Network |¡ç¦¡ | file Àü¼Û |¡ç¦¡¦¤ Disk¦¢ | Client | | S/W | | | | S/W | | Server | ¦¢Disk ¡é +-----------+ +-----------+ | | +-----------+ +-----------+ +-------+ +-------+ | | | file | | file | | | +-------+ +-------+ | | 1) fileÀÇ data¸¦ ó¸®ÇÑ´Ù. +-----------+ +----------+ +---------------+ | local |¦¡¦¡¦¡¦¡¡æ| file |¦¡¦¡¦¡¦¡¡æ| application | | file |¡ç¦¡¦¡¦¡¦¡| system |¡ç¦¡¦¡¦¡¦¡| software | +-----------+ +----------+ +---------------+ 2) ó¸®µÈ fileÀ» º»·¡·Î µÇµ¹¸°´Ù. Local Machine | Network | Remote Machine | | +-----------+data +-----------+ | data | +-----------+data +-----------+ | file Àü¼Û |¦¡¡æ | Network |¦¡¦¡¦¡¦¡¦¡¦¡¦¡¡æ | Network | ¦¡¡æ| file Àü¼Û |¦¡¦¡¦¤ | Client | | S/W | | | | S/W | | Server | ¡éDisk +-----------+ +-----------+ | | +-----------+ +-----------+ +-------+ | | | file | +-------+ 1. ÀÚ¿ø °øÀ¯Çü networkÀÇ Àü´Þ °æ·Î Local Machine | Network | Remote Machine | | +--------+ +--------+ +--------+ | | +-----------+ | ÀÀ ¿ë |¦¡¡æ | File |¦¡¡æ|Network |¦¡¦¡¦¡¦¡¦¡¦¡¦¡¡æ | Network |¦¡¦¡¦¤ | S/W |¡ç¦¡ | System |¦¡¦¤| S/W | | | | S/W | ¦¢ +--------+ +--------+ ¦¢+--------+ | | +-----------+ ¡é ¡é | | +--------------+ +---------+ | | | Remote | | Local | | | | file service | | file | | | +--------------+ +---------+ | | 2. ÀÚ¿ø °øÀ¯Çü networkÀÇ Software ±¸¼º Client +--------------------------------+ | Application S/W | +-----------------¦½-------------+ ¦ Server +-----------------¦À-------------+ +-------------------------------------+ | +---------------¦À-----------+ | | +-------------+ +--------------+ | | | ¦®¦¬¦¬¦¬¦µ¦¬¦¬¦¬¦¯ | | | | | | | | | +-------¦À----------+ ¦ | | | | Remote File | | Local File | | | +-------¦À--------+ | Remote | | | | Server | | Server | | | | ¦ | | File | | | | ¦®¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦¯ | | | | Local File | | °ü¸® | | | +-------¦À----+ +------¦À------+ | | | °ü¸® | | ¦ | | | +-------¦À----+ +------¦À------+ | | | ¦ | | ¦ | | | | ¦ | | ¦ | | | +-------¦À--------+ +---¦À---+ | | | ¦ | | ¦ | | | +-------¦À--------+ +---¦À---+ | | | Network | | Hard Disk | | | | ¦ | | ¦ | | | | 󸮺Π| | Á¦¾î | | | | Hard Disk | | Network| | | | ¦ | | ¦ | | | | °ü¸® | | 󸮺Π| | | | ¦ | | ¦ | | | | ¦ | | ¦ | | | | ¦ | | ¦ | | | +----+--¦À--------+ +---¦À¦¨-+ | | +---¦¨--¦À----+ +------¦À--+---+ | +------|--¦À--------------¦À¦«----+ +-----¦«--¦À----------------¦À--|-----+ | ¦ ¦¦¢ ¦¢ ¦ ¦ | | ¡é ¦¦¢ ¦¢ ¦ ¡é | +----+--------+ ¦¦¢ ¦¢ ¦ +----------+--+ | File | ¦¦¢ ¦¢ ¦ | File | +-------------+ ¦¦¢ ¦¢ ¦ +-------------+ Disk ¦¦¢ ¦¢ ¦ Disk ¦±¦»¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦¬¦»¦¬¦° ---------------------------¦ª----------------------¦ª--------------------------------- 3. NFS(Network File System) * disk ¿µ¿ªÀ» °ü¸®ÇÏ°í fileÀÇ access¸¦ °ü¸®Çϱ⵵ ÇÏ´Â µîÀÇ ÀÏÀº OSÀÇ filesystemÀÌ ´ã´çÇÏ´ø °Í. ÀÌ¿Í °°ÀÌ filesystemÀÌ ÇÏ´ø ÀÛ¾÷À» networkÀ» ÃÊ¿ùÇؼ ¿©·¯´ëÀÇ ÄÄÇ»ÅÍ°¡ ½ÇÇàÇÒ ¼ö ÀÖ°Ô²û ÇÑ °ÍÀÌ ¹Ù·Î NFSÀÌ´Ù. * NFS´Â local file systemÀÌ ÀÖ´Â directory¿¡¼ remote system»óÀÇ directory¿Í ³í¸®ÀûÀ¸·Î ¿¬°á(mount)ÇÏ´Â ÀÛ¾÷À» ÇØÁØ´Ù. ÀÏ´Ü ±× Á¢¼Ó(mount)°¡ ÀÌ·ç¾îÁö¸é local disk¿Í ¸¶Âù°¡Áö·Î remote disk¸¦ ÀüÇô Â÷ÀÌ ¾øÀÌ accessÇÒ ¼ö ÀÖ´Ù. »ç¿ëÀÚ³ª applicationÀº ÀÚ½ÅÀÌ accessÇÏ·Á´Â ÈÀÏÀÌ ½ÇÁ¦·Î ¾î´À ÄÄÇ»ÅÍ¿¡ ÀÖ´ÂÁö¸¦ ÀǽÄÇÒ ÇÊ¿ä°¡ ¾ø´Ù. * NFS Á¢¼Ó ¹æ½ÄÀº local diskÀÇ filesystemÀÌ "UFS(4.2)" typeÀ¸·Î mountµÇµíÀÌ remote diskÀÇ filesystem or directory¸¦ "nfs" typeÀ¸·Î mountÇÏ¸é µÈ´Ù. * NFS´Â server-client model·Î ±¸ÇöµÇ¸ç local disk¸¦ »ç¿ëÇÒ ¼ö ÀÖ°Ô²û Çã¿ëÇØ ÁÖ´Â ÂÊ, Áï exportÇØ ÁÖ´Â ÂÊÀ» "nfs server"¶ó ÇÏ°í remote disk¸¦ »ç¿ëÇÏ·Á ÇÏ´Â ÂÊ, Áï nfs mountÇÏ·Á´Â ÂÊÀ» "nfs client"¶ó ÇÑ´Ù. * NFS¸¦ »ç¿ëÇÏ¿© ¾òÀ» ¼ö ÀÖ´Â ÀÌÁ¡ Áß 'diskÀÇ Àý¾à'ÀÌ ÀÖ´Ù. ¿©·¯ ½Ã½ºÅÛ¿¡¼ ¶È °°ÀÌ »ç¿ëÇÏ´Â fileµéÀ» °¢ ½Ã½ºÅÛ disk¸¶´Ù ÀúÀåÇØ ³õÁö ¾Ê°í ÇÑ ½Ã½ºÅÛ¿¡¸¸ ÀúÀåÇØ ³õ°í NFS mountÇØ »ç¿ëÇÏ¸é ±×¸¸Å disk¸¦ Àý¾àÇÒ ¼ö ÀְԵȴÙ. * óÀ½¿¡´Â Sun workstationµéÀÌ disk¸¦ °øÀ¯Çϱâ À§ÇØ °³¹ßÇÏ¿´Áö¸¸ ¿äÁîÀ½Àº ±âÁ¾¿¡ °ü°è¾øÀÌ ¶Ç ¿©·¯ OS¿¡ ±¸ÇöµÇµµ·Ï ¼³°èµÇ¾î ÀÖ´Ù. ¸¹Àº vendorµéÀÌ ±×µéÀÇ ÄÄÇ»ÅÍ¿¡ ´ëÇØ NFS¸¦ Á¦°øÇÏ°í ÀÖ´Ù. ÀÌó·³ ¹Î°£ ±â¾÷ÀÌ µ¶ÀÚÀû »ç¾çÀ» °áÁ¤ÇÑ °ÍÀÌ ¾÷°è¿¡ ³Î¸® ¼ö¿ëµÇ¸é¼ »ç½Ç»óÀÇ Ç¥ÁØÀÌ µÈ °æ¿ì¸¦ "defact standard(¾÷°èÇ¥ÁØ)"À̶ó ºÎ¸£°í IEEE µî °ø°ø±â°ü¿¡¼ ±ÔÁ¤µÈ "IS(International Standard:±¹Á¦Ç¥ÁØ)"°ú´Â ±¸º°µÈ´Ù. 4. NFSÀÇ Software ±¸¼º Client Server +-----------------------+ | Application Program | "remote file °ü¸®ºÎ¿¡ ÇØ´ç" +-----------------------+ ¦ ¡é ¦ +---------+ ¦¬¦¬¦¬¦¬¦¬¦´ +-----------+ ¦£¦¡¦¡¦¡| vnode |¦¡¦¡¦¡¦¡¦¤ ¦ "nework °ü¸®ºÎ¿¡ ÇØ´ç" ¦£¦¡¦¡¦¡¦¡¡æ| vnode | ¦¢ +---------+ ¦¢ ¦ ¦ ¦¢ +-----------+ ¡é ¡é ¡é ¦ ¦ ¦¢ ¡é +----------+ +---------+ +----------+¦ +-------------+ +-----------+ | 4.2 BSD | | VFS | | Remote |¦ | NFS server | | 4.2 BSD | | VFS | +---------+ | VFS |¦ +-------------+ | VFS | +----------+ ¦¢ +----------+¦ ¡è +-----------+ ¡é ¡é ¦ ¦¢ ¡é +---------+ +----------+¦ +-------------+ +-----------+ | File | | RPC/XDR |¦° | RPC / XDR | | File | +---------+ +----------+ +-------------+ +-----------+ ¦¢ ¡è ¡é ¦¢ +----------+ +-------------+ | TCP/IP | | TCP / IP | +----------+ +-------------+ LAN ¦¢ ¦¢ ¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦ª¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦ª¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡¦¡ VFS: Virtual File System vnode : vitual node RPC: Remote Procedure Call XDR: External Data Representation Revision History Created on Jan. 22 ,1993