Ramdisk: Difference between revisions

Latest revision as of 15:08, 19 December 2024

On critical daq servers (clondaqx) directory /et have to reside in ramdisk. Create directory /et, and add following line in /etc/fstab:

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

it will show up after reboot. To enable it without reboot, type mkdir /et and mount /et.

To let users to delete each other files, remove sticky bit from /et permissions:

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

@@ 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'', and add following line in ''/etc/fstab'':
-  su
+  none  /et  tmpfs   nodev,nosuid,noexec,nodiratime,size=4096M   0 0
- mkdir /etc
-  mount -t tmpfs -o size=4g xfs /et
+it will show up after reboot. To enable it without reboot, type ''mkdir /et'' and ''mount /et''.
+To let users to delete each other files, remove sticky bit from ''/et'' permissions:
-To make it permanent, add following line in ''/etc/fstab'':
+ chmod 777 /et
-  tmpfs   /etc   xfs   nodev,nosuid,noexec,nodiratime,size=4096M   0 0
@@ Line 22: / Line 23: @@
   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