Mounting An Nfs4 File System As V4.0 In CentOS 7.4?

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CentOS 7.4 client mounting a CentOS 7.4 server filesystem over nfs4.

nfs seems to be much slower since the upgrade to 7.4, so I thought it might be nice to mount the directory as v4.0 rather than the new default of v4.1 to see if it makes a difference.

The release notes state, without an example:

“You can retain the original behavior by specifying 0 as the minor version”

nfs(5) states:

**
Recent kernels allow the minor version to be specified using the vers= option. For example, specifying vers=4.1 is the same as specifying vers=4,minorversion=1.
**

but in fstab or on the command line, using either form (vers=4.0
or vers=4,minorversion=0), if I run mount afterwards, I still see vers=4.1 for the mount.

I’m missing something obvious, but the only thing obvious to me is that I can’t see it.