Seeing the error /proc/sys/vm/nr_pdflush_threads: Operation not permitted when attempting to set vm.nr_pdflush_threads on Red Hat Enterprise Linux 4 & 5 kernels.

Solution Verified - Updated -

Issue

  • User attempts to change the number of pdflush threads using sysctl or echo (sysctl -w vm.nr_pdflush_threads=4 or echo 4 >  /proc/sys/vm/nr_pdflush_threads)
  • Error appears on console.
  • vm.nr_pdflush_threads remains unchanged.

Environment

  • Red Hat Enterprise Linux(RHEL) 4
  • Red Hat Enterprise Linux(RHEL) 5

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