On 25/09/2021 09:00, Ed Greshko wrote:
On 25/09/2021 14:07, Terry Barnaby wrote:
A few questions.
1. Are you saying your NFS server HW is the same for the past 25
years. Couldn't have been all Fedora, right?
No ( :) ) was using previous Linux and Unix systems before then.
Certainly OS versions and hardware has changed over the years but
setup is the same and no hardware changed in that last couple of
years certainly no hardware/software changes in the last couple of
months when the problem started to occur apart from Fedora33 updates.
OK. Kinda sounded like the server HW was "old".
2. How many clients? Connected on a single or multiple switches?
5 clients, two switches, but clients on the single switch to the
server have the issue as well as others. Pings still operate in
locked up condition.
Since all clients are being affected in the same manner it would point
more towards a server issues as you've already
concluded.
3. Do the lockups happen during a given time of day, or random?
They appear to be random although they appear more frequently when
first logging in (more /home accesses then ?).
Not that it matters, but everyone isn't logging in at the same time
correct? At login folks are getting lock ups most
frequently.
4. Have you checked for possible disk errors on the server?
No disk related error messages and RAID file systems show as ok.
Smartctl shows no issue on disks.
Are you running sysstat and collecting system information? You may
want to consider doing that to see, for example,
if "sar -n NFS" or "sar -n NFSD" show anything unusual. LIke
excessive re-transmission.
Thanks for the info. Yes, sysstat is running I will try "sar -n NFS" and
"sar -n NFSD" as well as "mountstats /home" which I have found after a
lockup has occurred. Although "systat does no seem to list max latency
which would be the pointer to look for. Actually I was thinking it may
be the clients rather than the server as normally there are "NFS server
not responding" messages on the clients if the server is down for some
reason, but obviously it could be either.
Random login times and it occurs during the day as well.
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