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

After upgrading our cluster to 6.0, nodes have crashed or left the cluster during loads. In rare circumstances, a node could require a reboot.


  • 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

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