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Date:      Wed, 5 Dec 2018 20:04:52 -0600
From:      Carson Chittom <carson@wistly.net>
To:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   can't copy files >= 1M to NFS share
Message-ID:  <20181206020451.DE4E9103AC@mailuser.nyi.internal>

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I've got an 11.2 system acting as my media server. I'm successfully exporti=
ng the directory which contains the media files via NFS, so that
they're accessible on my workstation, which is running Windows 10 Pro. I ca=
n read the files fine from the Windows machine using the built-in
Microsoft NFS client, and I can create directories, new files, and so forth=
 from the Windows machine in the share.

The issue is that I can't copy any files greater than or equal to 1M from t=
he Windows system to the NFS share.  I confirmed this by using dd
to create a file which is 1023k, which I was able to copy, and one which is=
 1024k, which I was not.  I get the same behavior whether I try to
drag-and-drop into the NFS share, copy-and-paste, or using "copy" in the Wi=
ndows Command Prompt.  The error that Windows immediately gives me is
"Error 0x8007045D: The request could not be performed because of an I/O dev=
ice error."  (And again, I *don't* get this error if the file is under 1M.)

I've done some web searches, and there's a fair amount of that particular e=
rror code--but nothing that I saw seemed directly relevant
(mostly about timeouts...but I'm getting the error immediately).  Maybe I'm=
 just bad at Google.

My /etc/exports is unexceptional, literally just the line:

/usr/local/plexdata -mapall=3Dplex

Unfortunately, I don't have another system to hand to test mounting the sha=
re.  So at this point, I'm not sure where to poke. Is this something I
can address from the FreeBSD side?  A limitation of the Windows NFS client?=
  Some unfortunate combination of them?

If anybody can point me in the right direction, I'd be appreciative.



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