On 28/02/2026 8:21 am, BERTRAND Joël wrote:
Michael van Elst a écrit :
[email protected] (=?UTF-8?Q?BERTRAND_Jo=c3=abl?=) writes:
CPU is an i7-4770, main memory 16 GB. This server exports /srv and
/home through NFS (V3/TCP, 128 threads, async) and disk I/O from NFS
clients are very slow. Server load can raise until 110 or 120 during
huge NFS access.
Can you quantify what "slow" means? Any kind of benchmarks?
Less than 2 MB/s.
The server load just shows that the NFS requests are distributed over
your server threads. But that is not related to any CPU utilization.
I know. NFS process never reaches 35% of one core.
As per Michael's email, re: isolating disk and client, can you isolate which
system it is slow serving to? I think that is important.
I note you use VMS, which is notorious for going out of "tune" if disks
fragment or fill etc.
I would want to check each of the server's disks for performance to ensure they
aren't failing - likewise the logs will help in this regard (perhaps install
SMART to monitor them?)
What is your vfs.nfs.iothreads value?
Regards,
Max.
