In RHEL 8, RH134, Chapter 9, Section 1, it has this:
I've never used the soft option and wondered exactly what it did. So I went to the man pages -- and guess what? It isn't there. So I went searching on the internet. I found many places that recommend against using this option as it may cause loss of data (definitely not a good thing).
I also found this, on Red Hat's own site. Granted, it was written when RHEL 5 was out (other references on other sites were much more recent):
Is it still not a good idea to use soft in RHEL 8? Have the potential data loss issues been mitigated?
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I do tell my students about _netdev when working with network file systems:
