Re: fstrim and LUKS [Re: Fedora 32 System-Wide Change proposal: Enable fstrim.timer by default]

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On Saturday, December 21, 2019 1:59:03 AM MST Vitaly Zaitsev via devel wrote:
> On 20.12.2019 21:53, Chris Murphy wrote:
> 
> > If your LUKS drives are listed in fstab, they will have fstrim issued
> > and it will pass down to the physical drive.
> 
> 
> Only with enabled discard option in /etc/crypttab, because trimming of
> LUKS significantly decrease security level (everyone even without
> password/key knowledge can identify that drive contains LUKS filesystem
> and used disk space).

That's already a default in Fedora, as we've already made that trade-off. This 
is why I personally wouldn't use TRIM, but I can certainly see how it'd be 
useful to those who are actually looking for longevity (not performance, TRIM 
doesn't get you better performance) over security.

-- 
John M. Harris, Jr.
Splentity

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