Network File System
Network File System
(NFS)
(NFS)
Submitted To:
Submitted To: Rachana Kamaliya
Rachana Kamaliya
P
Presented By
resented By: Krupa Shingala
: Krupa Shingala
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Network File System: Understanding NFS and Its Advantages and Disadvantages, Essays (university) of Operating Systems
An overview of the Network File System (NFS), its architecture, advantages, and disadvantages. NFS is a distributed file system developed by Sun Microsystems for UNIX-based workstations, allowing users to access files and directories on remote computers. various versions of NFS, its protocol, and the advantages and disadvantages of using NFS.
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2019/2020
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Network File SystemNetwork File System
(NFS) (NFS)
Submitted To: Submitted To: Rachana KamaliyaRachana Kamaliya
P Presented Byresented By:: Krupa ShingalaKrupa Shingala
Index
What is File System?
What is Network File System?
Version of NFS
NFS Architecture
Advantages of NFS
Disadvantages of NFS
Conclusion
References
What is Network File System?What is Network File System?
- (^) NFS developed by SUN Microsystems for use on its UNIX-based workstations.
- (^) A distributed file system
- (^) Allows users to access files and directories located on remote computers
- (^) But, data potentially stored on another machine.
- (^) NFS builds on the Open Network Computing Remote Procedure Call (ONC RPC) system
Continue…Continue… Mechanism for storing files on a network. Allows users to ‘Share’ a directory. NFS most commonly used with UNIX systems. Other software platforms:
- Mac OS, Microsoft Windows, Novell NetWare, etc. Major Goals:
- simple crash recovery -reasonable performance :80% of a local drive
Version 3 NFS v3 can operate across TCP as well as UDP Support for asynchronous writes on the server Obtains multiple file name, handles and attributes Support for 64-bit file sizes and offsets Handle files larger than 4 gigabytes (GB) Improves performance, and allowed it to work more reliably across the Internet
Version 4
Currently version 2 and version 3
protocols are in use with version 4 under
consideration for a standard
includes more performance
improvements
Mandates strong security
introduces a stateful protocol
developed with the IETF (Internet
Engineering Task Force)
RPC request Action CREATE Creates (or truncates) a file in the directory LINK Creates a hard link LOOKUP Looks up a file in the directory MKDIR Makes a directory READADDR Reads the contents of a directory REMOVE Removes a file in the directory RENAME Renames a file in the directory RMDIR Removes a directory SYMLINK Creates a symbolic link NFS Protocol
stateless server and client
server can be rebooted and user on client
might be unaware of the reboot
client/server distinction occurs at the
application/user level not the system level
highly flexible, so we need to be disciplined
in our administration/configuration
Advantages
Disadvantage
uses RPC authentication
easily spoofed
filesystem data is transmitted in cleartext
Data could be copied
Network slower than local disk
Complexity, Security issues.
References www.compnetworking.com www.internetslang.com www.linux.com