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I have tried to create a script to flush writecache buffer.
All commands works in terminal.

Tested in a VM installed Lubuntu 20.04.3.

The script was named K99 being executable and owner root.
The script was copied to /etc/init.d/ and created symbolic link to /etc/rc0.d/ and /etc/rc6.d/

The script is
-----------------------------------------------------------------------------------------------------------------------------------
#!/bin/bash
sudo dmsetup message /dev/mapper/rc-wb_sda3 0 flush
sudo dmsetup suspend /dev/mapper/rc-wb_sda3
sudo dmsetup message /dev/mapper/rc-wb_sda4 0 flush
sudo dmsetup suspend /dev/mapper/rc-wb_sda4
sudo dmsetup message /dev/mapper/rc-wb_sda5 0 flush
sudo dmsetup suspend /dev/mapper/rc-wb_sda5
sudo dmsetup message /dev/mapper/rc-wb_sda6 0 flush
sudo dmsetup suspend /dev/mapper/rc-wb_sda6

exit 0

-----------------------------------------------------------------------------------------------------------------------------------

After copying the script and creating symbolic links was done shutdown command and GUI was finalized showing only the "shutdown screen terminal command" with the OS halted not being possible shutdown.
Thus I had forced a power off shutdown.
I next OS starting was done shutdown command. The OS not was halted, but running commands several times in "shutdown screen terminal command" and repeating the same commands not being possible shutdown the OS.

The script is correct ? All steps was correct ? Need more actions to work ?
I had searched in internet how create a script to run command in restart and shutdown, but unhappily is very much wrong information that not work.

Thanks for reply.
11-25-2021, 07:15 AM
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