Hello Spencer,

Thursday, June 15, 2006, 11:48:57 PM, you wrote:

SS> 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

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

SS> The maximum for the duplicate request cache is 1024.

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

And when it finds that all requests are 'in progress' - then what?
Thank you for info.

btw: it looks like A LOT of messages are being sent in that case to
syslog and that is perhaps one of the things which kills performance
and makes whole server unresponsive.

Best regards,
 Robert                            mailto:rmilkowski at task.gda.pl

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