> I had never thought of it, but maybe it’s a good idea. How do other > distros handle it?
On <https://askubuntu.com/questions/18903/how-to-enable-trim> they say: >Ubuntu 14.10 onwards: >In Ubuntu 14.10 and 15.04, TRIMming happens automatically every week on all >SSDs supported by fstrim. >$ tail -n1 /etc/cron.weekly/fstrim >/sbin/fstrim --all || true >Automatic TRIM (Deprecated, Slow): > [fstab...] >Encrypted Filesystems >The last step is not enough though. As long as LUKS is not aware that you want >to use TRIM it will effectively block all TRIM operations coming from the LVM >partition's file system, for security reasons. Add discard parameter to the >cryptdevice options in /etc/crypttab to make LUKS accept the discard behavior >of the LVM partition. >sda5_crypt UUID=e364d03f-[...]6cd7e none luks,discard More info about the latter: http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/ Note that guix /gnu/store/8vg9124cgm8d36zsy9ldcw53b1vrfy2w-lvm2-2.02.109/etc/lvm/lvm.conf explicitly disables (!) "discard".
