OS Distributed File Systems

Improves availability & performance

Decreases performance

They are consistent

Improves speed

Each client obtains a working copy from the server

When file is closed, the modified file is copied to the file server

The burden of coordinating file sharing is ignored by the system

Easy to implement in a single processor system

Servers may not run on dedicated machines

Servers and clients can be on same machines

Distribution cannot be interposed between a OS and the file system

OS cannot be distributed with the file system a part of that distribution

transfer data by entire file or immediate portion required

transfer the computation rather than the data

execute an entire process or parts of it at different sites

none of the mentioned

One processor as coordinator which handles all requests

It requires request,reply and release per critical section entry

The method is free from starvation

All of the mentioned

client interfacing

naming

migration

heterogeneity

Remote logging using ssh or telnet

Zone are configured for automatic access

FTP is not used

All of the mentioned

Starting the execution of the transaction

Breaking transaction into a number of subtransactions

Coordinating the termination of the transaction

All of the mentioned

Search for file within directory

Read a set of directory entries

Manipulate links and directories

All of the mentioned

file name need to be changed

file name need not to be changed

file’s host name need to be changed

file’s local name need to be changed