[Bug 250770] AWS EC2 system freezes up possibly associated with NFS (EFS)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250770

--- Comment #3 from Colin Percival <cperciva at FreeBSD.org> ---
My understanding is that EFS should have oneopenown and minorversion=1.  BTW on
recent EC2 images I have an "efs" special automount target
(https://www.daemonology.net/blog/2020-05-31-Some-new-FreeBSD-EC2-features.html)
-- not sure if this is useful to you here.

Something you haven't mentioned: Is your EFS I/O quota ok?  Running out of I/O
quota can make a system extremely slow (especially with a small filesystem
which gets more I/O tokens slowly).

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