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Solaris 10, Linux modernish, NFSv4 mounts fail

At some point, Linux stopped cleanly mounting NFSv4 shares from a Solaris 10 host cleanly. The error message in syslog is

nfs4_discover_server_trunking unhandled error -5. Exiting with error EIO

with "mount system call failed" as the terminal output.

The fix is the add the following mount options:


And the mount should be clean.