Ramdisk

On critical daq servers (clondaqx) directory /et have to reside in ramdisk.

Create directory /et:

mkdir /et

Add following line in /etc/fstab:

 none  /et  tmpfs   nodev,nosuid,noexec,nodiratime,size=4096M   0 0

To activate it without reboot, run following commands:

systemctl daemon-reload
mount /et
chmod 777 /et

General info

Check available memory size:

free -g

Example of creating 4G ramdisk and mounting it as /mnt/ramdisk:

su
mkdir /mnt/ramdisk
mount -t tmpfs -o size=4g xfs /mnt/ramdisk