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sources/tech/20180328 How To Create-Extend Swap Partition In Linux Using LVM.md → translated/tech/20180328 How To Create-Extend Swap Partition In Linux Using LVM.md
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translating-----geekpi 如何在 Linux 中使用 LVM 创建/扩展交换分区
How To Create/Extend Swap Partition In Linux Using LVM
====== ======
We are using LVM for flexible volume management so, why can’t we use LVM for swap space? 我们使用 LVM 进行灵活的卷管理，为什么我们不能将 LVM 用于交换分区呢？
This allow users to increase the swap partition whenever we need. 这让用户在需要时增加交换分区。
If you upgraded the RAM in your system, it is necessary to add more swap space. 如果你升级系统中的内存，则需要添加更多交换空间。
This help you to manage the system that run applications that require a large amount of memory. 这有助于你管理运行需要大量内存的应用的系统。
Swap can be created in three ways 可以通过三种方式创建交换分区
* Create a new swap partition * 创建一个新的交换分区
* Create a new swap file * 创建一个新的交换文件
* Extend swap on an existing logical volume (LVM) * 在现有逻辑卷（LVM）上扩展交换分区
It’s recommended to create a dedicated swap partition instead of swap file. 建议创建专用交换分区而不是交换文件。
**Suggested Read :** **建议阅读：**
**(#)** [3 Easy Ways To Create Or Extend Swap Space In Linux][1] **(#)** [3 种简单的方法在 Linux 中创建或扩展交换空间][1]
**(#)** [Automatically Create/Remove And Mount Swap File In Linux Using Shell Script][2] **(#)** [使用 Shell 脚本在 Linux 中自动创建/删除和挂载交换文件][2]
What is the recommended swap size in Linux? Linux 中推荐的交换大小是多少？
### What Is Swap Space ### 什么是交换空间
Swap space in Linux is used when the amount of physical memory (RAM) is full. When physical RAM is full, inactive pages in memory are moved to the swap space. 当物理内存 （RAM） 已满时，将使用 Linux 中的交换空间。当物理内存已满时，内存中的非活动页将移到交换空间。
This helps system to run the application continuously but it’s not considered a replacement for more RAM. 这有助于系统连续运行应用程序，但它不被认为是更多内存的替代品。
Swap space is located on hard drives so, it would not processing the request like physical RAM. 交换空间位于硬盘上，因此它不会像物理内存那样处理请求。
### How To Create A Swap Partition Using LVM ### 如何使用LVM创建交换分区
As we already know how to create logical volume do the same for swap as well. Just follow the below procedure. 由于我们已经知道如何创建逻辑卷，所以交换分区也是如此。只需按照以下过程。
Create a logical volume which you required. In my case i’m going to create `5GB` of swap partition. 创建你需要的逻辑卷。在我这里，我要创建 `5GB` 的交换分区。
``` ```
$ sudo lvcreate -L 5G -n LogVol_swap1 vg00 $ sudo lvcreate -L 5G -n LogVol_swap1 vg00
Logical volume "LogVol_swap1" created. Logical volume "LogVol_swap1" created.
``` ```
Format the new swap space. 格式化新的交换空间。
``` ```
$ sudo mkswap /dev/vg00/LogVol_swap1 $ sudo mkswap /dev/vg00/LogVol_swap1
Setting up swapspace version 1, size = 5 GiB (5368705024 bytes) Setting up swapspace version 1, size = 5 GiB (5368705024 bytes)
@ -54,14 +51,14 @@ no label, UUID=d278e9d6-4c37-4cb0-83e5-2745ca708582
``` ```
Add the following entry to the `/etc/fstab` file. 将以下条目添加到 `/etc/fstab` 中。
``` ```
# vi /etc/fstab # vi /etc/fstab
/dev/mapper/vg00-LogVol_swap1 swap swap defaults 0 0 /dev/mapper/vg00-LogVol_swap1 swap swap defaults 0 0
``` ```
Enable the extended logical volume. 启用扩展逻辑卷。
``` ```
$ sudo swapon -va $ sudo swapon -va
swapon: /swapfile: already active -- ignored swapon: /swapfile: already active -- ignored
@ -71,7 +68,7 @@ swapon /dev/mapper/vg00-LogVol_swap1
``` ```
Test that the swap space has been added properly. 测试交换空间是否已正确添加。
``` ```
$ cat /proc/swaps $ cat /proc/swaps
Filename Type Size Used Priority Filename Type Size Used Priority
@ -85,18 +82,18 @@ Swap: 6 0 6
``` ```
### How To Expand A Swap Partition Using LVM ### 如何使用 LVM 扩展交换分区
Just follow the below procedure to extend an LVM swap logical volume. 只需按照以下过程来扩展 LVM 交换逻辑卷。
Disable swapping for the associated logical volume. 禁用相关逻辑卷的交换。
``` ```
$ sudo swapoff -v /dev/vg00/LogVol_swap1 $ sudo swapoff -v /dev/vg00/LogVol_swap1
swapoff /dev/vg00/LogVol_swap1 swapoff /dev/vg00/LogVol_swap1
``` ```
Resize the logical volume. I’m going to increase the swap volume from `5GB to 11GB`. 调整逻辑卷的大小。我将把交换空间从 `5GB 增加到 11GB`。
``` ```
$ sudo lvresize /dev/vg00/LogVol_swap1 -L +6G $ sudo lvresize /dev/vg00/LogVol_swap1 -L +6G
Size of logical volume vg00/LogVol_swap1 changed from 5.00 GiB (1280 extents) to 11.00 GiB (2816 extents). Size of logical volume vg00/LogVol_swap1 changed from 5.00 GiB (1280 extents) to 11.00 GiB (2816 extents).
@ -104,7 +101,7 @@ $ sudo lvresize /dev/vg00/LogVol_swap1 -L +6G
``` ```
Format the new swap space. 格式化新的交换空间。
``` ```
$ sudo mkswap /dev/vg00/LogVol_swap1 $ sudo mkswap /dev/vg00/LogVol_swap1
mkswap: /dev/vg00/LogVol_swap1: warning: wiping old swap signature. mkswap: /dev/vg00/LogVol_swap1: warning: wiping old swap signature.
@ -113,7 +110,7 @@ no label, UUID=2e3b2ee0-ad0b-402c-bd12-5a9431b73623
``` ```
Enable the extended logical volume. 启用扩展逻辑卷。
``` ```
$ sudo swapon -va $ sudo swapon -va
swapon: /swapfile: already active -- ignored swapon: /swapfile: already active -- ignored
@ -123,7 +120,7 @@ swapon /dev/mapper/vg00-LogVol_swap1
``` ```
Test that the logical volume has been extended properly. 测试逻辑卷是否已正确扩展。
``` ```
$ free -g $ free -g
total used free shared buff/cache available total used free shared buff/cache available
@ -142,7 +139,7 @@ Filename Type Size Used Priority
via: https://www.2daygeek.com/how-to-create-extend-swap-partition-in-linux-using-lvm/ via: https://www.2daygeek.com/how-to-create-extend-swap-partition-in-linux-using-lvm/
作者：[Ramya Nuvvula][a] 作者：[Ramya Nuvvula][a]
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