Linux System Management-(6)-btrfs file system

What is Btrfs?

Btrfs, a cow (copy-on-write) file system announced and in progress by Oracle in 2007. The goal is to replace Linux's current Ext3 file system to improve ext3 limitations, especially single file size limits, total file system size limits, and the addition of file checksum features. Added some features not currently supported by EXT3/4, such as writable disk snapshots (snapshots), and support for recursive snapshots (snapshots of snapshots), built-in disk array (RAID) support, support for the concept of sub-volumes (subvolumes), Allows the file system size to be resized online.

What are the features of Btrfs?
Multi-Physical volume support: Btrfs can be composed of multiple underlying physical volumes;

RAID support for online "add", "Remove", "modify";
Copy-on-write update mechanism (CoW): Copy, update, and replace pointers instead of "in-place" updates;
Check code: Checksum
Sub-Volume: Sub_volume
Snapshots: snapshots that support snapshots;
Transparent compression: Transparent relative to the user

How do I create btrfs?

Mkfs.btrfs
-L ' LABEL ' volume label
-D <type>: Raid0, RAID1, RAID5, Raid6, RAID10, single data storage structure
-M <profile>: RAID0, RAID1, RAID5, Raid6, RAID10, single, DUP metadata storage structure
-O <feature> Other features, some features require kernel support
-O List-all: Lists all supported feature;

# # Because Btrfs supports RAID technology by default so it should be more suitable for multi-drive situations, so I added 2 hard drives to the virtual machine for demonstration purposes

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Mkfs.btrfs-l Volume label/DEV/SDB/DEV/SDC

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Properties View:
Btrfs filesystem Show
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Mount File System:
Mount-t Btrfs/dev/sdb Mount_point

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Transparent compressor System:
Mount-o Compress={lzo|zlib} DEVICE mount_point

Btrfs Sub-command:

btrfs FileSystem show/dir View folder usage

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Btrfs filesystem resize {max|+[n]|-[n]}/dir

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Btrfs device Add/device/dir a device for Dir

Btrfs balance Start/dir to equalize files in Btrfs general the operation after device add

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Not to be continued.

Linux System Management-(6)-btrfs file system