nfs mounted /tmp vs disk mounted /tmp

[CyberLeo Kitsana]

On 03/03/2015 03:54 PM, Mike Tancsa wrote:
> 
> While trying to test in the lab a migration of disks from an old pci-x
> arcmrs array to a pcie card, I ran into an odd problem with the cli and
> raid management daemon.  I would start up the programs and they would
> immediately exit
> 
> Looking at the truss output, it seemed to bork soon after it tried to
> create a file in /tmp. Testing all the same hardware, but then booting
> from a disk, it worked.  Back to netboot, but this time with /tmp
> mounted via tmpfs, it also worked.  So it seems there is something about
> having tmp mounted via nfs that causes the program to die.  The issue
> seems to be the setting of locks. I am curious, is this something that
> can be worked around in nfs, or due to the nature of nfs, this is not
> possible ?  I think I saw this same issue with virtual box in a netboot
> environment
> (https://lists.freebsd.org/pipermail/freebsd-emulation/2014-July/011693.html)
<snip>
> fcntl(4,F_SETLKW,0x7ffffffcde10)                 ERR#45 'Operation not
> supported'

The fcntl(2) manpage says that F_SETLKW is for advisory locking. Does
your NFS infrastructure support advisory locks? Is lockd(8) running?

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