The management and application of Linux learning Note--btrfs file system

Btrfs

Btrfs (b-tree file system, commonly read as Butter Fs,better FS or B-tree FS), a file system that supports write-time replication (COW), can consist of multiple underlying physical volumes. In addition, the file system supports RAID, data and meta-data check code (checksum), sub-volume, snapshot and transparent compression function.

File system creation

Disk partitions are formatted after the partition is created

# mkfs.btrfs/dev/sda5 # mkdir/btrfsdisk # mount-t Btrfs/dev/sda5/btrfsdisk

Such a Btrfs file system was created and mounted in the/btrfsdisk directory

Here are a few common options for Mkfs.btrfs

Mkfs.btrfs

-L ' LABEL ': Specify volume label

-D <type>: Raid0, RAID1, RAID5, Raid6, RAID10, single

Indicates the raid level of the data store

-M <profile>: RAID0, RAID1, RAID5, Raid6, RAID10, single, DUP

Indicates the raid level of the metadata store

-O <feature>: Enable appropriate features

-O List-all: Lists all supported feature;

Properties View:

Btrfs filesystem Show

Create Snapshot

# ls/btrfsdisk test1 Test2 # VI test1 This was a test # btrfsctl–s Snap1/btrfsdisk # vi test1 Test1 is Modi Fied # cd/btrfsdisk/snap1 # cat Test1 This is a test

There are 2 files in the system when you create a snapshot Snap1. After the snapshot is created, modify the contents of the Test1. Then go back to Snap1, open the Test1 file, you can see Test1 content is still the previous content.

Create Subvolume

# mkdir/mnt/test # btrfsctl–s Sub1/btrfsdisk # mount–t Btrfs–o subvol=sub1/dev/sda5/mnt/test

Turn on the compression function

# mount–t Btrfs–o Compress/dev/sda5/btrfsdisk

The management and application of Linux learning Note--btrfs file system