On Thu, Robert Milkowski wrote:
> Hello nfs-discuss,
>   Sometimes on nfs servers I get below messages and then I have
>   performance problems. What are they about and what can I do about
>   this?
> XXXX  rpcmod: [ID 851375 kern.warning] WARNING: svc_cots_kdup no slots free
> XXXX  last message repeated 700353 times

This is an error from the NFS server when it attempts to place
a request into the duplicate request cache and finds that
all of the ones in the duplicate request table are "in progress".

The maximum for the duplicate request cache is 1024.

The most effective way to increase the value is /etc/system
and the variable would be: rpcmod:cotsmaxdupreqs 


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