mirror of
https://github.com/LCTT/TranslateProject.git
synced 2025-01-10 22:21:11 +08:00
150 lines
4.5 KiB
Markdown
150 lines
4.5 KiB
Markdown
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/
|