Re: 13-stable NFS server hang
- In reply to: Rick Macklem : "Re: 13-stable NFS server hang"
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Date: Mon, 04 Mar 2024 02:44:20 UTC
<<On Sun, 3 Mar 2024 13:17:30 -0800, Rick Macklem <rick.macklem@gmail.com> said: >> [I wrote:] >> (and so is dirty), this might take several seconds. I've set >> vfs.zfs.dmu_offset_next_sync=0 on the server that was hurting the most >> and am watching to see if we have more freezes. >> >> If this does the trick, then I can delay deploying a new kernel until >> April, after my upcoming vacation. > Interesting. Please let us know how it goes. It's been about 22 hours since I flipped the sysctl and it hasn't happened once yet. Of course I don't know what the users are up to right now, so I'll continue to monitor. This is the script I ended up with to monitor: nfsstat -dW | awk 'BEGIN { n = 0 } (n == 0) && ($12 == 0) { n = n + 1; system("date"); next } (n > 0) && ($12 == 0) { system("date; procstat -k 1184 1198; netstat -n -p tcp"); exit(0) } { n = 0 }' This should (if I haven't botched it) trigger only if two consecutive seconds show no forward progress. -GAWollman