After upgrading to 6.0, nodes have crashed or left the cluster during loads

The installer sets the kernel parameter "vm.min_free_kbytes" to the value of 4096. The reason this parameter is changed is due to most Linux distributions defaulting to a value of only 128. Increasing this value to a more reasonable number can resolve instability issues. 1. Update the running value: As root , execute # sysctl -w vm.min_free_kbytes=65536 2. Edit /etc/sysctl.conf replacing vm.min_free_kbytes = 4096 with vm.min_free_kbytes = 65536