On Sat, 25 Sept 2021 at 02:04, Terry Barnaby <ter...@beam.ltd.uk> wrote:
> Hi, > > I use NFS mount (defaults so V4) /home directories with a simple server > over Gigabit Ethernet all running Fedora33. This has been working fine > for 25+ years through various Fedora versions. However in the last month > or so all of the client computers are getting KDE GUI lockups every few > hours that last for around 40 secs. /home is not accessible during this > time and it feels/looks to be an NFS lockup issue. There are no "NFS > server no responding" or such like messages in either the servers or > clients /var/log/messages and the network communications seems fine. > > 1. Have there been some changes to NFS recently in the kernel ? > > 2. Any idea where to begin to try and debug this ? > > Think about what has changed. There is always a possibility of "old age" hardware problems. I once had a PCNFS system that was having NFS issues while connected to a big server with 100's of PCNFS clients. The vendor's ethernet diagnostics didn't find a problem, and other network services were working. A visual inspection of the network card found visibly heat-damaged components. Replacing the card solved the problem. With multiple clients having problems, look for ways to check all the upstream gear common to clients with issues: server, ethernet switches, and wiring. I have seen cables develop issues that were found using high-end cable test gear. -- George N. White III
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