Re: Fedora27: NFS v4 terrible write performance, is async working

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On Mon, Feb 12, 2018 at 05:09:32PM +0000, Terry Barnaby wrote:
> One thing on this, that I forgot to ask, doesn't fsync() work properly with
> an NFS server side async mount then ?

No.

If a server sets "async" on an export, there is absolutely no way for a
client to guarantee that data reaches disk, or to know when it happens.

Possibly "ignore_sync", or "unsafe_sync", or something else, would be a
better name.

--b.
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