swapon: /dev/mapper/vg_sys-lv_swap: swapon failed: Cannot allocate memory

Solution Verified - Updated -

Issue

  • Unable to activate the swap device.
  • When trying to enable swap devices with swapon -a command getting below error:
# swapon -a
swapon: /dev/mapper/vg_sys-lv_swap: swapon failed: Cannot allocate memory

Environment

  • Red Hat Enterprise Linux 7.6

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