Nfs – Why are noac/lookupcache NFS v4 mount options not allowed

nfsnfs4

I was trying some mount options from this answer, however, whenever, I have attempted using them I received this error when remounting:

mount.nfs4: mount(2): Invalid argument
mount.nfs4: an incorrect mount option was specified

When remounting, these are options that will are reported to be used by mount: "rw,noexec,remount,soft,intr,port=2049,sec=sys,lookupcache=none"

What is going on here? Are these options not supported by NFSv4?

Best Answer

Oh weird, I was unable to "remount" using these new options, but restarting the netfs daemon allows for the NFS mount to be remounted with the new options.