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My_BTRFS.md

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BTRFS:

https://www.youtube.com/watch?v=sm_fuBeaOqE at 8 min mark

References:

Follow the refernces for your set up and refer here for help https://btrfs.wiki.kernel.org/index.php/SysadminGuide#Snapshots https://wiki.archlinux.org/title/btrfs#Snapshots

Commands:

format:

mkfs.btrfs -L "ROOT" "/dev/sda2" -f

Creating subvolumes:

These are like folders which act like virtual partitions that can be mounted.(meaning linked(accessed) from that mount point.)

  • In ext4 generally to separate the home parition a separate parition is created but in btrfs a subvolume can do the job.

  • so, multiple subvolumes for each partition are created root subvolume is created at @: btrfs subvolume create /mnt/@ home at @home : btrfs subvolume create /mnt/@home

  • Generally these two are sufficient but we can also create: @var: btrfs subvolume create /mnt/@var @snapshots btrfs subvolume create /mnt/@snapshots

  • These subvols are then mounted by creating folders in the @ order is important:

These are not acctual commands but referecnes. You can refer to the actual commands in my sctipt.

Disk Setup

https://github.com/kud04rk/ArchBaseInstall/blob/main/1_disksetup.sh

Note

The below are not accutal commands.

mount -o noatime,compress=lzo,space_cache,subvol=@ /dev/sda2 /mnt
mkdir -p /mnt/{boot,home,var,.snapshots}
mount -o noatime,compress=lzo,space_cache,subvol=@home /dev/sda2 /mnt/home
mount -o noatime,compress=lzo,space_cache,subvol=@var /dev/sda2 /mnt/var
mount -o noatime,compress=lzo,space_cache,subvol=@snapshots /dev/sda2 /mnt/.snapshots

note boot cannot be btrfs (only fat32)

Mini Desc

  • Better file system

  • Similar to ext 4 we just format partition in btrfs

  • generally only one partition is created.

  • but multiple can be created.