Le 13/05/2020 à 07:32, Simon Matter via CentOS a écrit :
>> Le 12/05/2020 à 16:10, James Pearson a écrit :
>>> Patrick Bégou wrote:
>>>> Hi,
>>>>
>>>> I need some help with NFSv4 setup/tuning. I have a dedicated nfs server
>>>> (2 x E5-2620 8cores/16 threads each, 64GB RAM, 1x10Gb ethernet and 16x
>>>> 8TB HDD) used by two servers and a small cluster (400 cores). All the
>>>> servers are running CentOS 7, the cluster is running CentOS6.
>>>>
>>>> Time to time on the server I get:
>>>>
>>>> kernel: NFSD: client xxx.xxx.xxx.xxx testing state ID with
>>>> incorrect client ID
>>>>
>>>> And the client xxx.xxx.xxx.xxx freeze whith:
>>>>
>>>> kernel: nfs: server xxxxx.legi.grenoble-inp.fr not responding,
>>>> still trying
>>>> kernel: nfs: server xxxxx.legi.grenoble-inp.fr OK
>>>> kernel: nfs: server xxxxx.legi.grenoble-inp.fr not responding,
>>>> still trying
>>>> kernel: nfs: server xxxxx.legi.grenoble-inp.fr OK
>>>>
>>>> There is a discussion on RedHat7 support about this but only open to
>>>> subscribers. Other searches with google do not provide useful
>>>> information.
>>>>
>>>> Do you have an idea how to solve these freeze states ?
>>>>
>>>> More generally I would be really interested with some advice/tutorials
>>>> to improve NFS performances in this dedicated context. There are so
>>>> many
>>>> [different] things about tuning NFS available on the web that I'm a
>>>> little bit lost (the opposite of the previous question). So if some one
>>>> has "the tutorial"...;-)
>>> How many nfsd threads are you running on the server? - current count
>>> will be in /proc/fs/nfsd/threads
>>>
>>> James Pearson
>> Hi James,
>>
>> Thanks for your answer. I've configured 24 threads (for 16 hardware
>> cores/ 32Threads on the NFS server with this processors)
>>
>> But it seams that there are buffer setup to modify too when increasing
>> the threads number... It is not done.
>>
>> Load average on the server is below 1....
> I'd be very careful with higher thread numbers than physical cores. NFS
> threads and so called CPU hyper/simultaneous threads are quite different
> things and it can hurt performance if not configured correctly.
>
So you suggest to limit the setup to 16 daemons ? I'll try this evening.
Patrick
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