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Fix typo in btrfs userguide doc 

Signed-off-by: Samuel Dion-Girardeau <samuel.diongirardeau@gmail.com>
This commit is contained in:
Samuel Dion-Girardeau 2015-12-23 15:10:01 -05:00
parent fc87c5a2f1
commit 63f9f2c05b
1 changed files with 3 additions and 3 deletions
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6
docs/userguide/storagedriver/btrfs-driver.md
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@ -12,7 +12,7 @@ parent = "mn_storage_docker"
Btrfs is a next generation copy-on-write filesystem that supports many advanced Btrfs is a next generation copy-on-write filesystem that supports many advanced
storage technologies that make it a good fit for Docker. Btrfs is included in storage technologies that make it a good fit for Docker. Btrfs is included in
the mainline Linux kernel and it's on-disk-format is now considered stable. the mainline Linux kernel and its on-disk-format is now considered stable.
However, many of its features are still under heavy development and users should However, many of its features are still under heavy development and users should
consider it a fast-moving target. consider it a fast-moving target.
@ -47,7 +47,7 @@ Snapshots are a point-in-time read-write copy of an entire subvolume. They exist
Btfs allocates space to subvolumes and snapshots on demand from an underlying pool of storage. The unit of allocation is referred to as a *chunk* and *chunks* are normally ~1GB in size. Btfs allocates space to subvolumes and snapshots on demand from an underlying pool of storage. The unit of allocation is referred to as a *chunk* and *chunks* are normally ~1GB in size.
Snapshots are first-class citizens in a Btrfs filesystem. This means that they look, feel, and operate just like regular subvolumes. The technology required to create them is built directly into the Btrfs filesystem thanks to its native copy-on-write design. This means that Btrfs snapshots are space efficient with little or no performance overhead. The diagram below shows a subvolume and it's snapshot sharing the same data. Snapshots are first-class citizens in a Btrfs filesystem. This means that they look, feel, and operate just like regular subvolumes. The technology required to create them is built directly into the Btrfs filesystem thanks to its native copy-on-write design. This means that Btrfs snapshots are space efficient with little or no performance overhead. The diagram below shows a subvolume and its snapshot sharing the same data.
![](images/btfs_pool.jpg) ![](images/btfs_pool.jpg)
@ -91,7 +91,7 @@ ubuntu latest 0a17decee413 2 weeks ago
<none> <none> f9a9f253f610 2 weeks ago 188.1 MB <none> <none> f9a9f253f610 2 weeks ago 188.1 MB
``` ```
Each image layer exists as a Btrfs subvolume or snapshot with the same name as it's image ID as illustrated by the `btrfs subvolume list` command shown below: Each image layer exists as a Btrfs subvolume or snapshot with the same name as its image ID as illustrated by the `btrfs subvolume list` command shown below:
```bash ```bash
$ sudo btrfs subvolume list /var/lib/docker $ sudo btrfs subvolume list /var/lib/docker