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
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