statd question

man statd states:

For each NFS client or server machine to be monitored, rpc.statd creates a file in /var/lib/nfs/sm. When starting, it iterates through these files and notifies the peer rpc.statd on those machines.

A'm using nfs for a long time and I've never seen any file in /var/lib/nfs/sm. And I worry: is my nfs system feels ok? Or maybe something wrong with RPC? Or maybe secure-statd configure option is involved? So what does this absence of the monitored hosts in the sm dir mean? NFS in general works well for me, afaik.

Thanks in advance.

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