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
I set it to 8192 and see some problems with nfsd+zfs - like almost all
threads hanging in ZFS and no actual IOs are happening while I can
issue IOs to the same zfs filesystems locally (see nfsd threads hang
in ZFS on zfs-discuss list).
I did set rpcmod:cotsmaxdupreqs=8192
rpcmod:maxdupreqs=8192
Maybe it's too high?
--
Best regards,
Robert mailto:rmilkowski at task.gda.pl
http://milek.blogspot.com
