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--- linux:btrfs [21-10-2018 11:40]
edmc73 [Description]
+++ linux:btrfs [28-04-2021 16:16] (Version actuelle)
edmc73
@@ Ligne 119: / Ligne 119: @@
 Pour hdd
-  mount /dev/sda2 -o rw,noatime,compress=zlib,autodefrag
+  mount /dev/sda2 -o rw,noatime,compress=lzo,autodefrag
 Dans un fichier fstab, refaite la commande blkid et mettez à jour votre fstab
   UUID=a69d9182-f4c7-4276-b35d-7d5f9bd50a57      /      btrfs      rw,noatime,ssd,discard,autodefrag,compress=lzo      0      0
+FIXME
+Mettre à jour grub
+  mount /dev/sda2 /mnt
+  mount /dev/sda1 /mnt/boot/efi
+  for fs in proc sys dev dev/pts; do mount --bind /$fs /mnt/$fs; done
+  chroot /mnt
+  update-initramfs -u -k all
+  update-grub
+La suite peut aider mais pas nécessaire normalement.
+With Grub Legacy we need to modify root=UUID value in menu.lst file to btrfs partition’s manually. I used the following lines for Grub’s menu.lst file.
+  title       Linux 2.6.32.67
+  uuid        89591593-766e-4565-9d5c-017fb0e33298
+  kernel      /vmlinuz-2.6.32.67 root=UUID=a90c79b1-5883-44cc-9e74-752db9ca764d ro
+  initrd      /initrd.img-2.6.32.67
+In this example, a90c79b1-5883-44cc-9e74-752db9ca764d is the UUID of btrfs partition and 89591593-766e-4565-9d5c-017fb0e33298 is UUID of /boot partition.
+Also, I used following lines for my /etc/fstab file.
+  /dev/sda3       /boot       ext4     defaults       0       0
+  /dev/sda1       /           btrfs    defaults        0       1
+As you can see, I just wrote a path (/dev/sda1) instead of UUID as described in the referenced site.
+Update initrd images
+Because some scripts and hooking are added to initramfs, initrd images in /boot directory should be updated.
+I could not update them with command (i.e. update-initramfs -u -k all) described in the referenced site. It was guessed due to the kernel version difference between Live USB and my original installation. I designated the kernel version as a parameter like below and it worked.
+  update-initramfs -u -k 2.6.32.67
+-----------------------
+Si votre grub est coincé au redémarrage
+<code>
+grub>ls #pour lister les partition
+set root=(hd0,gpt2) # faite TAB en cours de frappe montre pas mal d'info sur la partition à choisir)
+linux /vmlinuz root=/dev/sda2 ro
+initrd /initrd.img
+boot
+</code>
+ensuite, pour réparer grub
+  update-grub
+===== Scripts tiers =====
+  # btrfs-list: a wrapper to btrfs-progs to show a nice overview of your btrfs subvolumes and snapshots, a la 'zfs list'
+  #
+  # Check for the latest version at:
+  # https://github.com/speed47/btrfs-list
+  # git clone https://github.com/speed47/btrfs-list.git
+  # or wget https://raw.githubusercontent.com/speed47/btrfs-list/master/btrfs-list -O btrfs-list
+  # or curl -L https://raw.githubusercontent.com/speed47/btrfs-list/master/btrfs-list -o btrfs-list
+===== io disk =====
+-- source: https://kinvolk.io/docs/flatcar-container-linux/latest/setup/debug/btrfs-troubleshooting/
+Disable copy-on-write
+Copy-On-write isn’t ideal for workloads that create or modify many small files, such as databases. Without disabling COW, you can heavily fragment the file system as explained above.
+The best strategy for successfully running a database in a container is to disable COW on directory/volume that is mounted into the container.
+The COW setting is stored as a file attribute and is modified with a utility called chattr. To disable COW for a MySQL container’s volume, run:
+  chattr -R +C /var/lib/mysql
+The directory /var/lib/mysql is now ready to be used by a Docker container without COW. Let’s break down the command:
+-R indicates that want to recursively change the file attribute +C means we want to set the NOCOW attribute on the file/directory
+To verify, we can run:
+<code>
+$ lsattr /var/lib/
+---------------- /var/lib/portage
+---------------- /var/lib/gentoo
+---------------- /var/lib/iptables
+---------------- /var/lib/ip6tables
+---------------- /var/lib/arpd
+---------------- /var/lib/ipset
+---------------- /var/lib/dbus
+---------------- /var/lib/systemd
+---------------- /var/lib/polkit-1
+---------------- /var/lib/dhcpcd
+---------------- /var/lib/ntp
+---------------- /var/lib/nfs
+---------------- /var/lib/etcd
+---------------- /var/lib/docker
+---------------- /var/lib/update_engine
+---------------C /var/lib/mysql
+</code>

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