I would like to install Ubuntu on my not so fresh laptop. Then I have the option to encrypt the hard drive using LVM. Now my question: does that draw computing power during startup or use?
Yes, it does. When you enter the password everything has to be decrypted. This takes a long time, depending on the amount of data.
Is that also the reason why the graphical user interface on my other computer takes so long to start? Sometimes it also gets hot and switches itself off.
Yes, it is. Decoding takes a lot of power and time and if the fans are also clogged the laptop / PC gets very hot and switches itself off…
That's not true! When entering the password, the actual key is unlocked and then checked. The decryption then takes place in the background when data is accessed. This consumes some CPU power, but is hardly noticeable on modern computers
If he were to decrypt the entire disk, he would have to encrypt it again when he shut down. And if the computer crashes, all data would be unencrypted, which would destroy the sense of encryption.
"Sometimes it gets hot and switches itself off"
This is more of a problem with cooling, i.e. Dirty. A popular problem with older devices.
