this is right. posix for posix sake shouldn't really be relevant anymore. look at the success of write-once s3. posix semantics were designed to address issues

this is right. posix for posix sake shouldn't really be relevant anymore. look at the success of write-once s3. posix semantics were designed to address issues of concurrent access to the same bytes. also, the only standard distributed protocol for posix, nfs, has always had a lot of design and implementation issues. v4 is complex and tries to address some of the consistency issues, but I don't know how successful it is in practice given the limited usage. treating blobs as immutable addressable objects and using other systems for coordination avoids a lot of the pain with caching, consistency, metadata performance, etc. you can layer those things...its a good cut for large scale distributed systems