mirror of
https://github.com/chubin/cheat.sheets
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56 lines
1.4 KiB
Plaintext
56 lines
1.4 KiB
Plaintext
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# Create a btrfs file system on /dev/sdb, /dev/sdc, and /dev/sdd
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mkfs.btrfs /dev/sdb /dev/sdc /dev/sdd
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# btrfs with just one hard drive, metadata not redundant
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# (this is danegerous: if your metadata is lost, your data is lost as well)
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mkfs.btrfs -m single /dev/sdb
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# data to be redundant and metadata to be non-redundant:
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mkfs.btrfs -m raid0 -d raid1 /dev/sdb /dev/sdc /dev/sdd
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# both data and metadata to be redundan
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mkfs.btrfs -d raid1 /dev/sdb /dev/sdc /dev/sdd
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# To get a list of all btrfs file systems
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btrfs filesystem show
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# detailed df for a fileesystem (mounted in /mnt)
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btrfs filesystem df /mnt
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# resize btrfs online (-2g decreases, +2g increases)
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btrfs filesystem resize -2g /mnt
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# use maximum space
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btrfs filesystem resize max /mnt
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# add new device to a filesystem
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btrfs device add /dev/sdf /mnt
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# remove devices from a filesystem
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btrfs device delete missing /mnt
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# create the subvolume /mnt/sv1 in the /mnt volume
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btrfs subvolume create /mnt/sv1
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# list subvolumes
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btrfs subvolume list /mnt
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# mount subvolume without mounting the main filesystem
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mount -o subvol=sv1 /dev/sdb /mnt
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# delete subvolume
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btrfs subvolume delete /mnt/sv1
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# taking snapshot of a subvolume
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btrfs subvolume snapshot /mnt/sv1 /mnt/sv1_snapshot
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# taking snapshot of a file (copy file by reference)
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cp --reflink /mnt/sv1/test1 /mnt/sv1/test3
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# convert ext3/ext4 to btrfs
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btrfs-convert /dev/sdb1
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# convert btrfs to ext3/ext4
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btrfs-convert -r /dev/sdb1
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