On Fri, Feb 3, 2017 at 9:32 AM, Tomasz Torcz <tomek(a)pipebreaker.pl> wrote:
On Fri, Feb 03, 2017 at 09:25:07AM -0700, Nathanael D. Noblet wrote:
> On Fri, 2017-02-03 at 09:40 -0500, Josh Boyer wrote:
> > On Mon, Jan 16, 2017 at 10:32 AM, Jan Kurik <jkurik(a)redhat.com>
> > wrote:
> > > = System Wide Change: Enable TRIM pass down to encrypted disks =
> > >
https://fedoraproject.org/wiki/Changes/EnableTrimOnDmCrypt
> > >
> > > Change owner(s):
> > > * Vratislav Podzimek <vpodzime AT redhat DOT com>
> > > * Ondrej Kozina <okozina AT redhat DOT com>
> > >
> > >
> > > Override kernel default for dm-crypt mappings of LUKS1 encrypted
> > > volumes via flag put in /etc/crypttab file. This change should
> > > affect
> > > only newly created encrypted storage based on LUKS1 format during
> > > installation.
>
> So I've got multiple systems with encrypted partitions on SSD disks.
> Are there ways of enabling this for pre-existing partitions?
I believe putting “discard” at the the of each line in /etc/crypttab
will do the trick.
That just causes device mapper to pass trim issued to the dmcrypt
device to the underlying block device; it doesn't actually issue trim.
Something else has to do that, like fstrim.service or discard mount
option for the file system; neither of which I'd recommend by default.
I'm not really sure what this feature is going to do on its own.
--
Chris Murphy