Hoi Alessio,
I have seen this (and it ruined my Victoria talk). In my experience
this happens most often when submitting many jobs and they start up at
the same time, and then NFS just gives up. It is disk dependent, and
it also depends on the I/O of other people.
Sorry that I cannot offer a solution apart from not submitting too
many jobs at the same time, but to make sure that they start up in a
sequential (instead of parallel) fashion.
Cheers,
--U.
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