From owner-freebsd-fs@FreeBSD.ORG  Wed Feb 29 18:57:17 2012
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Date: Wed, 29 Feb 2012 13:57:15 -0500
From: Garrett Wollman <wollman@bimajority.org>
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Cc: rmacklem@freebsd.org
Subject: Under what circumstances does the new NFS client return EAGAIN?
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I'm testing out a new file server, and trying to rsync files from
a proprietary NAS to the box I'm testing.  It's running the new NFS
code and 9.0.  rsync frequently and repeatably errors out with
something like this:

rsync: read errors mapping "[source file name]": Resource temporarily unavailable (35)

cp(1), on the other hand, seems just fine with the same source files.

Any ideas what causes this?

-GAWollman