NFSv4.1: RHEL Clients hang on IO operations

Solution Verified - Updated -

Issue

  • NFS clients hang when copying files to NFS shares.
  • Trying to read a file on a NFS share with# cat is slow.
  • Metadata operations like # ls are not slow.
  • NFSv4.1 is slower than NFSv4.0
  • fs/nfs/pnfs_nfs.c:789 nfs4_pnfs_ds_connect+0x300/0x3c0 is logged in the NFS clients /var/log/messages.

Environment

  • Red Hat Enterprise Linux 7
  • NFSv4.1

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