Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- btrfs [2016-04-12 22:50:02] – angelegt - Externe Bearbeitung 127.0.0.1
+++ btrfs [2024-07-13 03:28:41] (aktuell) – [Swap & Hibernate auf btrfs] david
@@ Zeile 313: / Zeile 313: @@
   - [[http://kofler.info/blog]]
   - [[http://www.pro-linux.de/]]
+===== Swap & Hibernate auf btrfs =====
+Swap:
+  * [[https://btrfs.readthedocs.io/en/latest/Swapfile.html]]
+  * [[https://jwillikers.com/btrfs-swapfile]]
+  * [[https://forums.fedoraforum.org/showthread.php?331916]]
+Sleep States:
+  * [[https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate]]
+  * [[https://wiki.debian.org/Suspend]]
+  * [[https://wiki.debian.org/Hibernation]]
+  * [[https://wiki.debian.org/Hibernation/Hibernate_Without_Swap_Partition]]
+  * [[https://en.wikipedia.org/wiki/ACPI#Power_states]]
+  * [[https://docs.kernel.org/admin-guide/pm/sleep-states.html]]
+Wenn der kernel im lockdown ist (z.B. secure boot), kann hibernate nicht genutzt werden:
+  * [[https://wiki.debian.org/SecureBoot#Secure_Boot_limitations]]
+  * [[https://lkml.iu.edu/hypermail/linux/kernel/1804.0/01607.html]]
+Getestet auf debian testing 13 (trixie).
+Empfehlung: nicht als skript, sondern interaktiv schritt für schritt ausführen!
+<code bash>
+#!/usr/bin/env bash
+set -o errexit
+set -o nounset
+set -o pipefail
+shopt -s inherit_errexit
+BTRFS_ROOT="/mnt/btrfs"
+SUBVOL_SWAP="@swap"
+SWAP="/swap"
+PARTUUID="$(findmnt / -no PARTUUID)"
+# 736a6f95-a7ac-410f-8065-65e629101f86
+mkdir -p "${BTRFS_ROOT}"
+mount -o subvolid=5 "/dev/disk/by-partuuid/${PARTUUID}" "${BTRFS_ROOT}"
+btrfs subvolume create "${BTRFS_ROOT}/${SUBVOL_SWAP}"
+chattr +C "${BTRFS_ROOT}/${SUBVOL_SWAP}"
+chmod 700 "${BTRFS_ROOT}/${SUBVOL_SWAP}"
+umount "${BTRFS_ROOT}"
+btrfs subvolume list /
+RAM_KIB="$(free -k --si | awk 'NR == 2 { print $2 }')"
+mkdir -p "${SWAP}"
+chmod 700 "${SWAP}"
+mount -o nodatacow,subvol="${SUBVOL_SWAP}" "/dev/disk/by-partuuid/${PARTUUID}" "${SWAP}"
+btrfs filesystem mkswapfile -s "${RAM_KIB}k" "${SWAP}/swapfile"
+chmod 600 "${SWAP}/swapfile"
+OFFSET="$(btrfs inspect-internal map-swapfile -r /swap/swapfile)"
+# 6619444
+echo "PARTUUID=${PARTUUID} /swap btrfs defaults,nodatacow,subvol=@swap 0 0" | sudo tee -a /etc/fstab
+echo "/swap/swapfile none swap defaults 0 0" | sudo tee -a /etc/fstab
+cat /etc/fstab
+# PARTUUID=736a6f95-a7ac-410f-8065-65e629101f86 /swap btrfs defaults,subvol=@swap 0 0
+# /swap/swapfile none swap defaults 0 0
+systemctl daemon-reload
+swapon -a
+swapon --show
+# add the following to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub
+echo "resume=PARTUUID=${PARTUUID} resume_offset=${OFFSET}"
+cat /etc/default/grub
+# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=PARTUUID=736a6f95-a7ac-410f-8065-65e629101f86 resume_offset=6619444"
+echo "RESUME=PARTUUID=${PARTUUID} resume_offset=${OFFSET}" | sudo tee /etc/initramfs-tools/conf.d/resume
+grub-mkconfig
+update-initramfs -k all -u
+echo "vm.swappiness = 10" | tee /etc/sysctl.d/99-swappiness.conf
+reboot
+</code>
+Folgende systemd services im nachhinein mit ''systemctl status'' untersuchen (siehe auch ''man systemd.special''):
+  * ''swap.target''
+  * ''sleep.target''
+  * ''suspend.target''
+  * ''hibernate.target''
+  * ''suspend-then-hibernate.target''
+  * ''hybrid-sleep.target''