В Tue, 31 Mar 2015 20:30:25 -0700
After comment from one of the nfs client maintainers,
the issue is simply one of config.
There are two *separate* syncs to consider -- at the server, and at the client.
'sync' on the EXPORT, and 'async' on the MOUNT is the sane approach;
sync on export should not be necessary - server must persist data when
client explicitly requests it and as long as client does not request
it, it probably does not care anyway.
But I do not know if Linux NFS server does implement it correctly.
That config also appears to return the performance.
The many recommendations online to use 'sync' for data integrity are IIUC for
sync on the server.
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