Chris Siebenmann wrote:
 We're running into a situation with one of our NFS ZFS fileservers[*]
where we're wondering if we have enough NFS server threads to handle
our load. Per 'sharectl get nfs', we have 'servers=512' configured,
but we're not sure we know how to check how many are actually in use
and active at any given time and whether or not we're running into
this limit.

If raising that limit then causes reports of:

WARNING: svc_cots_kdup no slots free
WARNING: svc_clts_kdup no slots free

together with the NFS clients getting EIO errors back, you may need to increase the size of the duplicate check cache in the kernel rpcmod by raising rpcmod:cotsmaxdupreqs and rpcmod:maxdupreqs (not sure that all Illumos distros use same default values).

--
Andrew

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