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The Coda Distributed File Systemby: Peter J. Braam
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Notes for this articlehaving a server-based fs greatly simplifies a number of issues
problems facing the design of a good distributed fs:
1. transport performance + latency
2. security of data
3. failures - network + server
client access to coda - not to a server but system as a whole
caching via Venus - (connected) caches all files, writes are done on cache, updates are sent to server when file is closed (disconnected) updates are stored in client modification log (CML) and re-integrated (merged) when system comes online
important files are hoarded - frequently updated cache copies
volumes are small filesystems
directories
files
volumes can be replicated in a volume server group (VSG) -- resolution of conflicts is done via version stamps
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