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rsize and wsize specified in NFSv4.1 mount is different than tcp-max-xfer-size value

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFSv4.1
  • Storage Virtual Machine (SVM)
  • Red Hat Enterprise Linux (RHEL) 9.2

Issue

  • A linux client is using RHEL 9.2 to mount NFS shares
  • The NFS SVM is configured with a certain tcp-max-xfer-size value

Example:

TCP Maximum Transfer Size (bytes): 262144
  • When a Linux client is mounting an NFS share on that SVM via NFSv4.1, the rsize and wsize show a different value:
(rw,relatime,vers=4.1,rsize=81016,wsize=70636,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=XXX.XXX.X.XX,local_lock=none,addr=XXX.XXX.X.XXX)
  • When the same NFS share is mounted via NFSv3, the expected rsize and wsize  values are shown:
(rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=XXX.XXX.X.XX,local_lock=none,addr=XXX.XXX.X.XXX)
  • Using RHEL 8.0 to mount the same NFS share via NFSv4.1 shows the expected rsize and wsize values:
(rw,relatime,vers=4.1,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=XXX.XXX.X.XX,local_lock=none,addr=XXX.XXX.X.XXX)

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