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linux:btrfs (lu 17137 fois)

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linux:btrfs [16-01-2021 17:15] – [Passer de ext4 à btrfs] edmc73linux:btrfs [28-04-2021 14:16] (Version actuelle) – edmc73
Ligne 177: Ligne 177:
 ensuite, pour réparer grub ensuite, pour réparer grub
   update-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>
linux/btrfs.1610817337.txt.gz · Dernière modification : de edmc73

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