Issue with NFSv4 not responding while transferring big files Large data move causing NFSv4 to stop working
Issue with NFSv4 not responding while transferring big files Large data move causing NFSv4 to stop working
Recorded in low light, I’m facing problems with NFS mounts. When moving files of reasonable size, everything seems to freeze. I see that using rsync to copy appears to fill a buffer before speed drops, causing delays until the next file starts. Ideally, there should be no such pauses. * This issue only occurs during writes on NFS, not reads from servers. Both servers are in the same datacenter. It seems the upload limit is reached, which likely leads to the server appearing unresponsive. * Here’s a sample from nfsiostat while handling a large file: op/s rpc bklog 338.00 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 15.000 1924.512 128.301 0 (0.0%) 14.133 62.333 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 243.000 31197.023 128.383 0 (0.0%) 12.156 176047.683 op/s rpc bklog 337.00 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 15.000 1924.395 128.293 0 (0.0%) 13.067 51.400 write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 245.000 31453.789 128.383 0 (0.0%) 12.420 177045.963 op/s rpc bklog 1820.00 0.00 read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) 0.000 0.000 0.000 0 (0.0%) * This only happens with writes, not reads. * I’m new to NFS tuning and would really appreciate any guidance.*