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