Thomas Kunz
Systems and Computer Engineering
13
File Systems: Other Examples
nMazer/Tardo
–file
synchronization layer between application and local file system
–caching of
complete subdirectories from the server
–“Redirector”
responses to requests locally if necessary, via the network if possible
–periodic
consistency checks with bi-directional updating
nFicus
–not a
client/server approach
–optimistic
approach based on replicates, detection of write conflicts, conflict resolution
–use of
„gossip“ protocols: a mobile computer does not necessarily need to have direct connection to a server, with the help of
other mobile computers
updates can be propagated through the network
nMIo-NFS (Mobile Integration of NFS)
–NFS
extension, pessimistic approach, only token holder can write
–connected/loosely
connected/disconnected