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