Ramdisk: Difference between revisions

Latest revision as of 13:45, 15 January 2026

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

Create directory /et:

mkdir /et
chmod 777 /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

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

@@ Line 1: / Line 1: @@
-On critical daq servers (clondaqx) directory ''/et'' resides in ramdisk. Following have to be done during installation:
+On critical daq servers (clondaqx) directory ''/et'' have to reside in ramdisk.
+Create directory ''/et'':
- su
   mkdir /et
-  mount -t tmpfs -o size=4g xfs /et
+  chmod 777 /et
-To make it permanent, add following line in ''/etc/fstab'':
+Add following line in ''/etc/fstab'':
-  tmpfs   /etc   xfs   nodev,nosuid,noexec,nodiratime,size=4096M   0 0
+  none  /et  tmpfs   nodev,nosuid,noexec,nodiratime,size=4096M   0 0
+To activate it without reboot, run following commands:
+ systemctl daemon-reload
+ mount /et
 '''General info'''
@@ Line 22: / Line 25: @@
   mkdir /mnt/ramdisk
   mount -t tmpfs -o size=4g xfs /mnt/ramdisk
-To make it permanent, add it to ''/etc/fstab'':
- tmpfs   /mnt/ramdisk   xfs   nodev,nosuid,noexec,nodiratime,size=4096M   0 0