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[#]: subject: "Use this Linux command-line tool to learn more about your NVMe drives"
[#]: via: "https://opensource.com/article/21/9/nvme-cli"
[#]: author: "Don Watkins https://opensource.com/users/don-watkins"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
Use this Linux command-line tool to learn more about your NVMe drives
======
The nvme-cli command has lots of useful options, and it's a great way to
take control of how you manage your data.
![Command line prompt][1]
NVMe stands for _Non-Volatile Memory Express_, and it refers to how software and storage communicate across PCIe and other protocols, including TCP. It's an [open specification][2] led by a non-profit organization and defines several forms of solid-state storage.
My laptop has an NVMe drive, as does my desktop. And they're fast. I love how quickly my computers boot and how quickly they're able to read and write data. There's no perceptible delay.
It also didn't take long for me to get curious about the technology driving this ultra-fast storage, so I did a little investigation. I learned that NVMe drives consume less power while delivering much faster access to data compared to even SSD drives over SATA. That was interesting, but I wanted to know more about my particular NVMe drives, and I wanted to know how they compared with other drives. Could I securely erase the drive? How could I check its integrity?
Those questions led me to an Internet search that yielded an open source project with a collection of tools to manage NVMe drives. It's called [nvme-cli][3].
### Install nvme-cli
You can install `nvme-cli` from your distribution's package manager. For instance, on Fedora, CentOS, or similar:
```
`$ sudo dnf install nvme-cli`
```
On Debian, Mint, Elementary, and similar:
```
`$ sudo apt install nvme-cli`
```
### Exploring an NVMe drive
After installing `nvme-cli` for my distribution, I wanted to explore my drive. There's no man page for `nvme-cli`, but you can get lots of help by entering `nvme help`:
```
$ nvme help
nvme-1.14
usage: nvme <command> [<device>] [<args>]
The '<device>' may be either an NVMe character device (ex: /dev/nvme0) or an
nvme block device (ex: /dev/nvme0n1).
The following are all implemented sub-commands:
 list List all NVMe devices and namespaces on machine
 list-subsys List nvme subsystems
 id-ctrl Send NVMe Identify Controller
 id-ns Send NVMe Identify Namespace, display structure
 id-ns-granularity Send NVMe Identify Namespace Granularity List, display structure
 list-ns Send NVMe Identify List, display structure
 list-ctrl Send NVMe Identify Controller List, display structure
 nvm-id-ctrl Send NVMe Identify Controller NVM Command Set, display structure
 primary-ctrl-caps Send NVMe Identify Primary Controller Capabilities
[...]
```
### List all NVMe drives
The `sudo nvme list` command lists all NVMe devices and namespaces on your machine. I used it and found an NVMe drive at `/dev/nvme0n1`. Here is the output:
```
$ sudo nvme list
Node SN Model Namespace Usage Format FW Rev
\--------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
/dev/nvme0n1    S42GMY9M141281 SAMSUNG MZVLB256HAHQ-000L7 1
214.68 GB / 256.06 GB 512  B + 0 B 0L2QEXD7
```
I have a drive called `nvme0n1`. It lists the serial number, brand, size, firmware revision, and so on.
You can get even more information about the drive and the features it supports by using the `id-ctrl` subcommand:
```
$ sudo nvme id-ctrl /dev/nvme0n1
NVME Identify Controller:
vid : 0x144d
ssvid : 0x144d
sn : S42GMY9M141281
mn : SAMSUNG MZVLB256HAHQ-000L7
fr : 0L2QEXD7
rab : 2
ieee : 002538
cmic : 0
mdts : 9
cntlid : 0x4
ver : 0x10200
rtd3r : 0x186a0
rtd3e : 0x7a1200
[...]
```
### Drive health
You can read about the overall health of a drive with the `smart-log` subcommand:
```
$ sudo nvme smart-log /dev/nvme0n1
Smart Log for NVME device:nvme0n1 namespace-id:ffffffff
critical_warning : 0
temperature : 21 C
available_spare : 100%
available_spare_threshold : 10%
percentage_used : 2%
endurance group critical warning summary: 0
data_units_read : 5,749,452
data_units_written : 10,602,948
host_read_commands : 77,809,121
host_write_commands : 153,405,213
controller_busy_time : 756
power_cycles : 1,719
power_on_hours : 1,311
unsafe_shutdowns : 129
media_errors : 0
num_err_log_entries : 1,243
Warning Temperature Time : 0
Critical Composite Temperature Time : 0
Temperature Sensor 1 : 21 C
Temperature Sensor 2 : 22 C
Thermal Management T1 Trans Count : 0
Thermal Management T2 Trans Count : 0
Thermal Management T1 Total Time : 0
Thermal Management T2 Total Time : 0
```
This provides you with the drive's current temperature, the hours of use it's had so far, how many times it was unsafely shut down, and so on.
### Formatting an NVMe drive
You can format an NVMe drive with `nvme-cli`, but beware: This erases all of the data on the drive! If there's important data on your drive, you _must_ back it up before doing this, or else you **will** lose data. The subcommand is `format`:
```
`$ sudo nvme format /dev/nvme0nX`
```
(For safety, I've replaced the actual location of the drive with **X** to prevent copy-paste mishaps. Change the **X** to **1** or the appropriate location as listed in the results of `nvme list`.)
### Securely erasing an NVMe drive
When you get ready to sell or dispose of your NVMe computer, you probably want to erase the drive securely. The same warnings apply here as with the format process: Back up important data first because this command erases it!
```
`$ sudo nvme sanitize /dev/nvme0nX`
```
### Try nvme-cli
The `nvme-cli` command is released under a [GPLv2][4] license. It's a robust command with lots of useful options, and it's a great way to take control of how you manage your data.
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/9/nvme-cli
作者：[Don Watkins][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/don-watkins
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/command_line_prompt.png?itok=wbGiJ_yg (Command line prompt)
[2]: https://nvmexpress.org/
[3]: https://github.com/linux-nvme/nvme-cli
[4]: https://github.com/linux-nvme/nvme-cli/blob/master/LICENSE

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@ -0,0 +1,182 @@
[#]: subject: "Use this Linux command-line tool to learn more about your NVMe drives"
[#]: via: "https://opensource.com/article/21/9/nvme-cli"
[#]: author: "Don Watkins https://opensource.com/users/don-watkins"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
使用这个 Linux 命令行工具来了解你的 NVMe 驱动器的更多信息
======
nvme-cli 命令有很多有用的选项，且它是一个很好的方式来控制你如何管理你的数据。
![Command line prompt][1]
NVMe 是指 _Non-Volatile Memory_（非易失性内存主机控制器接口规范），它指的是软件和存储如何通过 PCIe 和其他协议（包括 TCP）进行通信。它是一个由非营利组织领导的[开放规范][2]，并定义了几种形式的固态存储。
我的笔记本电脑有一个 NVMe 驱动器，我的台式机也有。而且它们的速度很快。我喜欢我的电脑启动的速度，以及它们读写数据的速度。没有可察觉的延迟。
没过多久，我就对驱动这种超高速存储的技术产生了好奇，所以我做了一些调查。我了解到，NVMe 驱动器消耗的电力更少，而提供的数据访问速度甚至比 SATA 的 SSD 驱动器快得多。这很有趣，但我想知道更多关于我的特定 NVMe 驱动器的信息，我想知道它们与其他驱动器相比如何。我可以安全地擦除驱动器吗？我怎样才能检查它的完整性？
这些问题让我在互联网上搜索，发现了一个开源项目，其中有一系列管理 NVMe 驱动器的工具。它被称为 [nvme-cli][3]。
### 安装 nvme-cli
你可以从你的发行版的包管理器中安装 `nvme-cli`。例如，在 Fedora、CentOS 或类似系统上：
```
`$ sudo dnf install nvme-cli`
```
在 Debian、Mint、Elementary 和类似系统上:
```
`$ sudo apt install nvme-cli`
```
### 探索 NVMe 驱动器
在为我的发行版安装 `nvme-cli` 后，我想探索我的驱动器。`nvme-cli` 没有手册页，但你可以通过输入 `nvme help` 获得很多帮助：
```
$ nvme help
nvme-1.14
usage: nvme <command> [<device>] [<args>]
The '<device>' may be either an NVMe character device (ex: /dev/nvme0) or an
nvme block device (ex: /dev/nvme0n1).
The following are all implemented sub-commands:
list List all NVMe devices and namespaces on machine
list-subsys List nvme subsystems
id-ctrl Send NVMe Identify Controller
id-ns Send NVMe Identify Namespace, display structure
id-ns-granularity Send NVMe Identify Namespace Granularity List, display structure
list-ns Send NVMe Identify List, display structure
list-ctrl Send NVMe Identify Controller List, display structure
nvm-id-ctrl Send NVMe Identify Controller NVM Command Set, display structure
primary-ctrl-caps Send NVMe Identify Primary Controller Capabilities
[...]
```
### 列出所有的 NVMe 驱动器
`sudo nvme list` 命令列出你机器上所有的 NVMe 设备和命名空间。我用它在 `/dev/nvme0n1` 找到了一个 NVMe 驱动器。下面是输出结果：
```
$ sudo nvme list
Node SN Model Namespace Usage Format FW Rev
\--------------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
/dev/nvme0n1 S42GMY9M141281 SAMSUNG MZVLB256HAHQ-000L7 1
214.68 GB / 256.06 GB 512 B + 0 B 0L2QEXD7
```
我有一个名为 `nvme0n1` 的驱动器。它列出了序列号、品牌、尺寸、固件版本等等。
通过使用 `id-ctrl` 子命令，你可以得到更多关于该硬盘和它所支持的特性的信息：
```
$ sudo nvme id-ctrl /dev/nvme0n1
NVME Identify Controller:
vid : 0x144d
ssvid : 0x144d
sn : S42GMY9M141281
mn : SAMSUNG MZVLB256HAHQ-000L7
fr : 0L2QEXD7
rab : 2
ieee : 002538
cmic : 0
mdts : 9
cntlid : 0x4
ver : 0x10200
rtd3r : 0x186a0
rtd3e : 0x7a1200
[...]
```
### 驱动器健康
你可以通过 `smart-log` 子命令来了解硬盘的整体健康状况：
```
$ sudo nvme smart-log /dev/nvme0n1
Smart Log for NVME device:nvme0n1 namespace-id:ffffffff
critical_warning : 0
temperature : 21 C
available_spare : 100%
available_spare_threshold : 10%
percentage_used : 2%
endurance group critical warning summary: 0
data_units_read : 5,749,452
data_units_written : 10,602,948
host_read_commands : 77,809,121
host_write_commands : 153,405,213
controller_busy_time : 756
power_cycles : 1,719
power_on_hours : 1,311
unsafe_shutdowns : 129
media_errors : 0
num_err_log_entries : 1,243
Warning Temperature Time : 0
Critical Composite Temperature Time : 0
Temperature Sensor 1 : 21 C
Temperature Sensor 2 : 22 C
Thermal Management T1 Trans Count : 0
Thermal Management T2 Trans Count : 0
Thermal Management T1 Total Time : 0
Thermal Management T2 Total Time : 0
```
这为你提供了硬盘的当前温度、到目前为止的使用时间、不安全的关机次数等等。
### 格式化一个 NVMe 驱动器
你可以用 `nvme-cli` 格式化一个 NVMe 驱动器，但要注意。这将删除驱动器上的所有数据！如果你的硬盘上有重要的数据，你必须在这样做之前将其备份，否则你**将会**丢失数据。子命令是 `format`：
```
`$ sudo nvme format /dev/nvme0nX`
```
(为了安全起见，我用 **X** 替换了驱动器的实际位置，以防止复制粘贴的错误。将 **X** 改为 **1** 或 `nvme list` 结果中列出的适当位置)。
### 安全地擦除 NVMe 驱动器
当你准备出售或处理你的 NVMe 电脑时，你可能想安全地擦除驱动器。这里的警告与格式化过程中的警告相同。首先要备份重要的数据，因为这个命令会删除这些数据！
```
`$ sudo nvme sanitize /dev/nvme0nX`
```
### 尝试 nvme-cli
`nvme-cli` 命令是在 [GPLv2][4] 许可下发布的。它是一个强大的命令，有很多有用的选项，它是控制你如何管理数据的好方法。
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/9/nvme-cli
作者：[Don Watkins][a]
选题：[lujun9972][b]
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/don-watkins
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/command_line_prompt.png?itok=wbGiJ_yg (Command line prompt)
[2]: https://nvmexpress.org/
[3]: https://github.com/linux-nvme/nvme-cli
[4]: https://github.com/linux-nvme/nvme-cli/blob/master/LICENSE