Merge pull request #8363 from lujun9972/add-MjAxODAzMjggSG93IFRvIENyZWF0ZS1FeHRlbmQgU3dhcCBQYXJ0aXRpb24gSW4gTGludXggVXNpbmcgTFZNLm1kCg==

选题: How To Create/Extend Swap Partition In Linux Using LVM
2024-12-26 21:30:55 +08:00 · 2018-04-03 14:35:23 +08:00 · 2018-04-03 14:35:23 +08:00 · 5f58cde2ae
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+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?
+
+This allow users to increase the swap partition whenever we need.
+
+If you upgraded the RAM in your system, it is necessary to add more swap space.
+
+This help you to manage the system that run applications that require a large amount of memory.
+
+Swap can be created in three ways
+
+  * Create a new swap partition
+  * Create a new swap file
+  * Extend swap on an existing logical volume (LVM)
+
+
+
+It’s recommended to create a dedicated swap partition instead of swap file.
+
+**Suggested Read :**
+**(#)** [3 Easy Ways To Create Or Extend Swap Space In Linux][1]
+**(#)** [Automatically Create/Remove And Mount Swap File In Linux Using Shell Script][2]
+
+What is the recommended swap size in Linux?
+
+### What Is Swap Space
+
+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.
+
+This helps system to run the application continuously but it’s not considered a replacement for more RAM.
+
+Swap space is located on hard drives so, it would not processing the request like physical RAM.
+
+### How To Create A Swap Partition Using LVM
+
+As we already know how to create logical volume do the same for swap as well. Just follow the below procedure.
+
+Create a logical volume which you required. In my case i’m going to create `5GB` of swap partition.
+```
+$ sudo lvcreate -L 5G -n LogVol_swap1 vg00
+ Logical volume "LogVol_swap1" created.
+
+```
+
+Format the new swap space.
+```
+$ sudo mkswap /dev/vg00/LogVol_swap1
+Setting up swapspace version 1, size = 5 GiB (5368705024 bytes)
+no label, UUID=d278e9d6-4c37-4cb0-83e5-2745ca708582
+
+```
+
+Add the following entry to the `/etc/fstab` file.
+```
+# vi /etc/fstab
+/dev/mapper/vg00-LogVol_swap1 swap swap defaults 0 0
+
+```
+
+Enable the extended logical volume.
+```
+$ sudo swapon -va
+swapon: /swapfile: already active -- ignored
+swapon: /dev/mapper/vg00-LogVol_swap1: found signature [pagesize=4096, signature=swap]
+swapon: /dev/mapper/vg00-LogVol_swap1: pagesize=4096, swapsize=5368709120, devsize=5368709120
+swapon /dev/mapper/vg00-LogVol_swap1
+
+```
+
+Test that the swap space has been added properly.
+```
+$ cat /proc/swaps
+Filename                Type        Size    Used    Priority
+/swapfile file      1459804 526336  -1
+/dev/dm-0 partition 5242876 0   -2
+
+$ free -g
+ total used free shared buff/cache available
+Mem: 1 1 0 0 0 0
+Swap: 6 0 6
+
+```
+
+### How To Expand A Swap Partition Using LVM
+
+Just follow the below procedure to extend an LVM swap logical volume.
+
+Disable swapping for the associated logical volume.
+```
+$ sudo swapoff -v /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`.
+```
+$ 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).
+ Logical volume vg00/LogVol_swap1 successfully resized.
+
+```
+
+Format the new swap space.
+```
+$ sudo mkswap /dev/vg00/LogVol_swap1
+mkswap: /dev/vg00/LogVol_swap1: warning: wiping old swap signature.
+Setting up swapspace version 1, size = 11 GiB (11811155968 bytes)
+no label, UUID=2e3b2ee0-ad0b-402c-bd12-5a9431b73623
+
+```
+
+Enable the extended logical volume.
+```
+$ sudo swapon -va
+swapon: /swapfile: already active -- ignored
+swapon: /dev/mapper/vg00-LogVol_swap1: found signature [pagesize=4096, signature=swap]
+swapon: /dev/mapper/vg00-LogVol_swap1: pagesize=4096, swapsize=11811160064, devsize=11811160064
+swapon /dev/mapper/vg00-LogVol_swap1
+
+```
+
+Test that the logical volume has been extended properly.
+```
+$ free -g
+ total used free shared buff/cache available
+Mem: 1 1 0 0 0 0
+Swap: 12 0 12
+
+$ cat /proc/swaps
+Filename                Type        Size    Used    Priority
+/swapfile file      1459804 237024  -1
+/dev/dm-0 partition 11534332    0   -2
+
+```
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/how-to-create-extend-swap-partition-in-linux-using-lvm/
+
+作者：[Ramya Nuvvula][a]
+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://www.2daygeek.com/author/ramya/
+[1]:https://www.2daygeek.com/add-extend-increase-swap-space-memory-file-partition-linux/
+[2]:https://www.2daygeek.com/shell-script-create-add-extend-swap-space-linux/