[arch-general] LUKS on LVM example in wiki

[Brett M. Gilio]

Hello FA,

Did you get an answer to your question? Let me know if you still need help.

BMG

Brett M. Gilio
B.S. Biological Sciences
B.M. Music Composition
http://www.brettgilio.com/

"Sometimes the obvious is the enemy of the true." 
- G. Stolzenberg

On 11/19/2017 09:53 AM, Fons Adriaensen wrote:
> I've been reading the section 'LUKS on LVM' in the wiki page
>
> <https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system>
>
> and there's something I fail to understand.
>
> Under 'Preparing the logical volumes', there is:
>
> # lvcreate -L 500M -n tmp MyVol
>
> (which isn't shown in the ascii picture just above).
>
> Later, under 'Configuring fstab and crypttab' a tmpfs is created on the
> encrypted /tmp partition:
>
> dev/mapper/tmp         /tmp    tmpfs           defaults        0       0
>
> Question: as far as I've understood, a tmpfs resides in RAM, with 
> overflow to /swap. So why is there a logical volume for /tmp ?
> Or put otherwise, if /tmp is to reside on disk, why use a tmpfs ?
>
> TIA,
>