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I did search the forum. Here is a pretty lot of topics but it's still confused for me and topics remain not fully explored.
For example this one https://bbs.archlinux.org/viewtopic.php?id=291981 or https://bbs.archlinux.org/viewtopic.php?id=282759 I feel they don't cover all aspects.
I have LVM on Luks setup. Here is the setup
❯ lsblk -l
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
cryptlvm 254:0 0 951.9G 0 crypt
HynixVolGroup-swap 254:1 0 8G 0 lvm [SWAP]
HynixVolGroup-root 254:2 0 80G 0 lvm /
HynixVolGroup-home 254:3 0 863.6G 0 lvm /home
nvme0n1 259:0 0 953.9G 0 disk
nvme0n1p1 259:1 0 2G 0 part /boot
nvme0n1p2 259:2 0 951.9G 0 partHow to properly setup trim. Here is my possible steps.
1. Add to the
/boot/loader/entries/arch.confhook like this
options cryptdevice=UUID=********12c9128:cryptlvm:[b]allow-discards[/b] root=/dev/HynixVolGroup/rootThis will trim on / partition correct?
Because on wiki page I see
Besides the kernel option, it is also required to periodically run fstrim or mount the filesystem (e.g. /dev/mapper/root in this example) with the discard option in /etc/fstab. For details, please refer to the TRIM page.
For LUKS devices unlocked via /etc/crypttab use option discard, e.g.:
The question is do I need to add something to /etc/crypttab? This file is empty now on my setup. Or should I add something to /etc/fstab?
2. Enable fstrim.timer with systemctl enable fstrim.timer. This will trim on /boot partition, correct?
3. For non root filesystem the wiki says https://wiki.archlinux.org/title/Solid_ … e#dm-crypt
For non-root filesystems, configure /etc/crypttab to include discard in the list of options for encrypted block devices located on an SSD (see dm-crypt/System configuration#crypttab).
This is completely non-understandable for me. Because discard option it's continuous trim. Should I use it instead of periodical trim?
Last edited by webcapcha (2024-04-13 21:29:07)
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