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It depends on the underlying file system. If df says the disk is full, possible reasons are : you are not mounting the root of the NFS 100 G file system, and there are other files that you do not see because they are higher up than your mount point. you are mounting some other file system on top of the problem file system, and so hiding files there are ...


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Finally it turned out that nfs was responsible. Client was v.4, while server v.3 and therefore, mount option sec=sys was necessary at the client part. Thanks to all who bothered.


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I strongly suspect that oflag=dsync is the reason causing this - dd executed on host, obeys this flag, sshfs instead doesn't pass this to the server, therefore its making use of caching methods. Usually NFS should be one of the fastest options to access remote storage. Compared to SSHFS your data doesn't have to went trough encryption and the FUSE stack.



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