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Fixed sudo-ed invocations for BTRFS command

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This commit is contained in:
Michele Cereda
2022-07-03 00:09:23 +02:00
parent 5eb6ecdb6f
commit 2cc5cf8f6e
1 changed files with 16 additions and 14 deletions
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30
knowledge base/btrfs.md
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@@ -5,47 +5,49 @@
```sh
# Create a volume with single metadata and double data blocks
# Useless in practice but a good example.
mkfs.btrfs --metadata single --data dup /dev/sdb
sudo mkfs.btrfs --metadata single --data dup /dev/sdb
# Sparse a volume on multiple devices.
mkfs.btrfs --label data /dev/sd{a,c,d,e,f,g} --force \
sudo mkfs.btrfs --label data /dev/sd{a,c,d,e,f,g} --force \
&& echo "LABEL=data /mnt/data btrfs compress=zstd 0 0"
| tee -a /etc/fstab
# List all btrfs file systems.
btrfs filesystem show
sudo btrfs filesystem show
# Show detailed `df` analogue for a filesystem.
btrfs filesystem df path/to/filesystem
sudo btrfs filesystem df path/to/filesystem
# Give more details about usage.
btrfs filesystem usage path/to/filesystem
sudo btrfs filesystem usage path/to/filesystem
# Resize online volumes.
# -2g decreases, +2g increases.
btrfs filesystem resize -2g path/to/volume
btrfs filesystem resize max path/to/volume
sudo btrfs filesystem resize -2g path/to/volume
sudo btrfs filesystem resize max path/to/volume
# Add new devices to a filesystem.
btrfs device add /dev/sdf /mnt
sudo btrfs device add /dev/sdf /mnt
# Remove devices from a filesystem.
btrfs device delete missing /mnt
sudo btrfs device delete missing /mnt
# List subvolumes.
btrfs subvolume list /mnt
sudo btrfs subvolume list /mnt
# Create subvolumes.
btrfs subvolume create /mnt/subvolume
btrfs subvolume create ~/subvolume
sudo btrfs subvolume create /mnt/subvolume
# Create a readonly snapshot of a subvolume.
sudo btrfs subvolume snapshot -r /mnt/volume/data /mnt/volume/snapshot
btrfs subvolume snapshot ~/subvolume ~/snapshot
sudo btrfs subvolume snapshot -r /mnt/volume/subvolume /mnt/volume/snapshot
# Mount subvolumes without mounting their main filesystem.
mount -o subvol=sv1 /dev/sdb /mnt
sudo mount -o subvol=sv1 /dev/sdb /mnt
# Delete a subvolume.
sudo btrfs subvolume delete --commit-each /mnt/volume/data
sudo btrfs subvolume delete --commit-each /mnt/volume/subvolume
# Deduplicate a volume's blocks.
sudo duperemove -Adrh --hashfile=/tmp/dr.hash /mnt/volume1 /media volume2