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translating----geekpi
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Using Stratis to manage Linux storage from the command line
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======
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As discussed in [Part 1][1] and [Part 2][2] of this series, Stratis is a volume-managing filesystem with functionality similar to that of [ZFS][3] and [Btrfs][4]. In this article, we'll walk through how to use Stratis on the command line.
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### Getting Stratis
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For non-developers, the easiest way to try Stratis now is in [Fedora 28][5].
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Once you're running this, you can install the Stratis daemon and the Stratis command-line tool with:
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```
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# dnf install stratis-cli stratisd
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```
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### Creating a pool
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Stratis has three concepts: blockdevs, pools, and filesystems. Blockdevs are the block devices, such as a disk or a disk partition, that make up a pool. Once a pool is created, filesystems can be created from it.
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Assuming you have a block device called `vdg` on your system that is not currently in use or mounted, you can create a Stratis pool on it with:
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```
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# stratis pool create mypool /dev/vdg
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```
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This assumes `vdg` is completely zeroed and empty. If it is not in use but has old data on it, it may be necessary to use `pool create`'s `- force` option. If it is in use, don't use it for Stratis.
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If you want to create a pool from more than one block device, just list them all on the `pool create` command line. You can also add more blockdevs later using the `blockdev add-data` command. Note that Stratis requires blockdevs to be at least 1 GiB in size.
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### Creating filesystems
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Once you've created a pool called `mypool`, you can create filesystems from it:
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```
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# stratis fs create mypool myfs1
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```
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After creating a filesystem called `myfs1` from pool `mypool`, you can mount and use it, using the entries Stratis has created within /dev/stratis:
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```
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# mkdir myfs1
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# mount /dev/stratis/mypool/myfs1 myfs1
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```
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The filesystem is now mounted on `myfs1` and ready to use.
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### Snapshots
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In addition to creating empty filesystems, you can also create a filesystem as a snapshot of an existing filesystem:
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```
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# stratis fs snapshot mypool myfs1 myfs1-experiment
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```
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After doing so, you could mount the new `myfs1-experiment`, which will initially contain the same file contents as `myfs1`, but could change as the filesystem is modified. Whatever changes you made to `myfs1-experiment` would not be reflected in `myfs1` unless you unmounted `myfs1` and destroyed it with:
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```
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# umount myfs1
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# stratis fs destroy mypool myfs1
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```
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and then snapshotted the snapshot to recreate it and remounted it:
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```
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# stratis fs snapshot mypool myfs1-experiment myfs1
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# mount /dev/stratis/mypool/myfs1 myfs1
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```
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### Getting information
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Stratis can list pools on the system:
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```
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# stratis pool list
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```
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As filesystems have more data written to them, you will see the "Total Physical Used" value increase. Be careful when this approaches "Total Physical Size"; we're still working on handling this correctly.
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To list filesystems within a pool:
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```
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# stratis fs list mypool
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```
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To list the blockdevs that make up a pool:
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```
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# stratis blockdev list mypool
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```
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These give only minimal information currently, but they will provide more in the future.
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#### Destroying a pool
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Once you have an idea of what Stratis can do, to destroy the pool, first make sure all filesystems created from it are unmounted and destroyed, then use the `pool destroy` command:
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```
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# umount myfs1
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# umount myfs1-experiment (if you created it)
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# stratis fs destroy mypool myfs1
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# stratis fs destroy mypool myfs1-experiment
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# stratis pool destroy mypool
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```
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`stratis pool list` should now show no pools.
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That's it! For more information, please see the manpage: `man stratis`.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/18/5/stratis-storage-linux-command-line
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作者：[Andy Grover][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://opensource.com/users/agrover
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[1]:https://opensource.com/article/18/4/stratis-easy-use-local-storage-management-linux
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[2]:https://opensource.com/article/18/4/stratis-lessons-learned
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[3]:https://en.wikipedia.org/wiki/ZFS
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[4]:https://en.wikipedia.org/wiki/Btrfs
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[5]:https://fedoraproject.org/wiki/Releases/28/Schedule
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@ -0,0 +1,134 @@
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使用 Stratis 从命令行管理 Linux 存储
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======
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正如本系列的[第一部分][1]和[第二部分][2]中所讨论的，Stratis 是一个具有与 [ZFS][3] 和 [Btrfs] [4] 相似功能的卷管理文件系统。在本文中，我们将介绍如何在命令行上使用 Stratis。
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### 安装 Stratis
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对于非开发人员，现在尝试 Stratis 最简单的方法是在 [Fedora 28][5] 中。
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你可以用以下命令安装 Stratis 守护进程和 Stratis 命令行工具：
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```
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# dnf install stratis-cli stratisd
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```
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### 创建一个池
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Stratis 有三个概念：blockdevs、池和文件系统。 Blockdevs 是组成池的块设备，例如磁盘或磁盘分区。一旦创建池，就可以从中创建文件系统。
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假设你的系统上有一个名为 `vdg` 的块设备，它目前没有被使用或挂载，你可以在它上面创建一个 Stratis 池：
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```
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# stratis pool create mypool /dev/vdg
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```
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这假设 `vdg` 是完全清零并且是空的。如果它没有被使用，但有旧数据，则可能需要使用 `pool create` 的 ` - force` 选项。如果正在使用，请勿将它用于 Stratis。
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如果你想从多个块设备创建一个池，只需在 `pool create` 命令行中列出它们。你也可以稍后使用 `blockdev add-data` 命令添加更多的 blockdevs。请注意，Stratis 要求 blockdevs 的大小至少为 1 GiB。
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### 创建文件系统
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在你创建了一个名为 `mypool` 的池后，你可以从它创建文件系统：
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```
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# stratis fs create mypool myfs1
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```
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从 `mypool` 池创建一个名为 `myfs1` 的文件系统后，可以使用 Stratis 在 /dev/stratis 中创建的条目来挂载并使用它：
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```
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# mkdir myfs1
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# mount /dev/stratis/mypool/myfs1 myfs1
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```
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文件系统现在已被挂载在 `myfs1` 上并准备可以使用。
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### 快照
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除了创建空文件系统之外，你还可以创建一个文件系统作为现有文件系统的快照：
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```
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# stratis fs snapshot mypool myfs1 myfs1-experiment
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```
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这样做后，你可以挂载新的 `myfs1-experiment`，它将初始包含与 `myfs1` 相同的文件内容，但它可能随着文件系统的修改而改变。无论你对 `myfs1-experiment` 所做的任何更改都不会反映到 `myfs1` 中，除非你卸载了 `myfs1` 并将其销毁：
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```
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# umount myfs1
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# stratis fs destroy mypool myfs1
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```
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然后进行快照以重新创建并重新挂载它：
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```
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# stratis fs snapshot mypool myfs1-experiment myfs1
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# mount /dev/stratis/mypool/myfs1 myfs1
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```
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### 获取信息
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Stratis 可以列出系统中的池：
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```
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# stratis pool list
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```
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随着文件系统写入更多数据，你将看到 “Total Physical Used” 值的增加。当这个值接近 “Total Physical Size” 时要小心。我们仍在努力处理这个问题。
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列出池中的文件系统：
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```
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# stratis fs list mypool
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```
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列出组成池的 blockdevs：
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```
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# stratis blockdev list mypool
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```
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目前只提供这些最少的信息，但它们将在未来提供更多信息。
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#### 摧毁池
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当你了解了 Stratis 可以做什么后，要摧毁池，首先确保从它创建的所有文件系统都被卸载并销毁，然后使用 `pool destroy` 命令：
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```
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# umount myfs1
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# umount myfs1-experiment (if you created it)
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# stratis fs destroy mypool myfs1
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# stratis fs destroy mypool myfs1-experiment
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# stratis pool destroy mypool
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```
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`stratis pool list` 现在应该显示没有池。
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就是这些！有关更多信息，请参阅手册页：“man stratis”。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/18/5/stratis-storage-linux-command-line
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作者：[Andy Grover][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://opensource.com/users/agrover
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[1]:https://opensource.com/article/18/4/stratis-easy-use-local-storage-management-linux
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[2]:https://opensource.com/article/18/4/stratis-lessons-learned
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[3]:https://en.wikipedia.org/wiki/ZFS
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[4]:https://en.wikipedia.org/wiki/Btrfs
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[5]:https://fedoraproject.org/wiki/Releases/28/Schedule
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