On Tue, Apr 28, 2020, at 6:51 PM, Chris Adams wrote:
> Now that Fedora 32 has fstrim.timer enabled by default... how about
> discards for the things that fstrim doesn't get?  Two main things I know
> of:
> 
> - swap: Do discard at swapon time by setting "discard=once" in
>   /etc/fstab would be somewhat similar to the periodic fstrim call.  I
>   don't know how much impact the "discard=pages" option might have (the
>   man page says it is asynchronous, but it might make low-memory
>   situations worse).
> 

Seems reasonable.

> - logical volumes: Set "issue_discards = 1" in /etc/lvm/lvm.conf so that
>   removed LVs get discarded.
> 

Could foreclose data recovery in case LV was removed entirely, so I'd leave it 
to fstrim.timer on the eventual filesystem.

V/r,
James Cassell
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