@ Stefan, I was able to confirm the workaround. I modified my dd to use
sync and direct(o_sync and o_direct):
strace -o /tmp/strace.dd.joe.out dd if=/dev/zero of=/nfs_mount/syncfile
bs=1k count=5 oflag=sync,direct
I confirmed the file was opened with both those flags(From strace):
open("/nfs_mount/syncfile", O_WRONLY|O_CREAT|O_TRUNC|O_SYNC|O_DIRECT, 0666) = 3
I captured a tcpdump and reviewed the trace in wireshark. I can confirm
that there are FILE_SYNC writes instead of UNSTABLE.
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https://bugs.launchpad.net/bugs/709392
Title:
NFS client does not submit "nfs_file_sync" write requests when the
file open call includes O_SYNC.
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