PowerFlex: SVM vm.overcommit Best Practices

To check and/or modify the SVM vm.overcommit settings, follow these steps:

1. Log in to the SVM using SSH as root

2. Run 

cat /etc/sysctl.conf | grep "vm.overcommit"

Example:

[root@sds-node logs]# cat /etc/sysctl.conf | grep "vm.overcommit"
vm.overcommit_memory = 2
vm.overcommit_ratio = 50

3, Run the following commands

sed -i 's/vm\.overcommit_memory = .*/vm\.overcommit_memory = 2/g' /etc/sysctl.conf
sed -i 's/vm\.overcommit_ratio = .*/vm\.overcommit_ratio = 100/g' /etc/sysctl.conf
sysctl -p

Validation

[root@sds-node logs]# cat /etc/sysctl.conf | grep "vm.overcommit"
vm.overcommit_memory = 2
vm.overcommit_ratio = 100

Repeat these steps on all SVMs in the environment to ensure that they are set to the recommended best practice settings. You do not need to place the SDS into maintenance mode to perform this operation. 

Related article: DTA 217648: PowerFlex: Storage Data Server Nodes May Not Contain Correct System Tuning Parameters Which May Result in Performance Issues (Customer Login is needed)