20.04.3 - swap file dissapeared

[Colin Law]

On Fri, 15 Oct 2021, 13:35 Lentes, Bernd, <
bernd.lentes at helmholtz-muenchen.de> wrote:

> Hi,
>
> we have an Ubuntu Server running with a swap file of 4GB:
>
> root at crispor-server:~# ll /swap.img
> -rw------- 1 root root 4294967296 Aug 11 16:45 /swap.img
> root at crispor-server:~#
>
> In most cases it isn't used.
> But some time ago we had performance problems and i realized that the file
> seemed to be gone.
> I have atop running and logging every second:
>
> SWP | tot     0.0M |  free    0.0M |
>
> After a reboot it is available again !?!
>
> SWP | tot     4.0G |  free    4.0G |
>
> Any idea ?
>


The file hadn't gone, or a reboot would not have fixed it. It looks as if
swap had been disabled. However if that were the case I would have expected
it to stay disabled on reboot.

Colin


>
> Bernd
>
>
>
>
> --
>
> Bernd Lentes
> System Administrator
> Institute for Metabolism and Cell Death (MCD)
> Building 25 - office 122
> HelmholtzZentrum München
> bernd.lentes at helmholtz-muenchen.de
> phone: +49 89 3187 1241
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