Thomas Kunz
Systems and Computer Engineering
7
File Systems: Motivation
nGoal
–efficient
and transparent access to shared files within a mobile environment while maintaining data consistency
nProblems
–limited
resources of mobile computers (memory, CPU, ...)
–low
bandwidth, variable bandwidth, temporary disconnection
–high
heterogeneity of hardware and software components (no standard PC architecture)
–wireless
network resources and mobile computer are not very reliable
–standard
file systems (e.g., NFS, network file system) are very inefficient, almost unusable
nSolutions
–replication
of data (copying, cloning, caching)
–data
collection in advance (hoarding, pre-fetching)