That's a configurable option (mount -o soft). On Ubuntu, the nfs(5) manpage has more information. This option is a good thing in a strict client/server scenario where the client should not lose data even if the server is rebooted. Years ago I watched an NFS mount in an old broadcast video setup recover unimpeded after its target system was rebooted.
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SMB at least avoids the stupid NFS behaviour where any program that tries to read while the server's offline uninterruptibly hangs.
That's a configurable option (mount -o soft). On Ubuntu, the nfs(5) manpage has more information. This option is a good thing in a strict client/server scenario where the client should not lose data even if the server is rebooted. Years ago I watched an NFS mount in an old broadcast video setup recover unimpeded after its target system was rebooted.