This can be fixed by not using a hardmount in /etc/fstab. If you add the
"soft" option to your mount parameters, the filesystem remains active. I
think this is expected behavior for NFS (hard is default due to possible
instability issues with soft mounting).
>From man nfs:
soft / hard Determines the recovery behavior of the NFS client after
an NFS request times out. If neither option is speci-
fied (or if the hard option is specified), NFS requests
are retried indefinitely. If the soft option is speci-
fied, then the NFS client fails an NFS request after
retrans retransmissions have been sent, causing the NFS
client to return an error to the calling application.
NB: A so-called "soft" timeout can cause silent data
corruption in certain cases. As such, use the soft
option only when client responsiveness is more important
than data integrity. Using NFS over TCP or increasing
the value of the retrans option may mitigate some of the
risks of using the soft option.
--
autofs hangs when server unavailable
https://bugs.launchpad.net/bugs/234480
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