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178 lines
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178 lines
5.1 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: (geekpi)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How to Extend/Increase LVM’s (Logical Volume Resize) in Linux)
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[#]: via: (https://www.2daygeek.com/extend-increase-resize-lvm-logical-volume-in-linux/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How to Extend/Increase LVM’s (Logical Volume Resize) in Linux
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======
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Expanding the logical volume is extremely easy, it takes very few steps and can be done online without unmounting a certain logical volume.
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The main purpose of LVM is flexible disk management, which allows you to easily resize, extend and reduce the logical volume size when you need it.
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If you are new to Logical Volume Management (LVM), I suggest you start with our previous article.
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* **Part-1: [How to Create/Configure LVM (Logical Volume Management) in Linux][1]**
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![][2]
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Expanding the logical volume involves the below steps.
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* Check if you have sufficient unallocated disk space in the volume group where the LV was residing.
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* If yes, you can use that space to extend the logical volume.
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* If not, add new disks or LUNs to your system.
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* Convert a physical disk as a physical volume (PV).
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* Extend the Volume Group
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* Increase the logical Volume
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* Grow the filesystem
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* Check the extended filesystem size
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### How to Create LVM Physical Volumes
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Create LVM physical volumes with the pvcreate command.
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Once the disk is detected in the OS, use the pvcreate command to initialize the LVM PV (Physical Volumes).
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```
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# pvcreate /dev/sdc
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Physical volume "/dev/sdc" successfully created
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```
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**Make a note:**
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* The above command erases any data on the given disk /dev/sdc.
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* Physical disk can be added directly into the LVM PV instead of the disk partition.
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Use the pvdisplay command to display the PVs you have created.
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```
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# pvdisplay /dev/sdc
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"/dev/sdc" is a new physical volume of "10.00 GiB"
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--- NEW Physical volume ---
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PV Name /dev/sdc
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VG Name
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PV Size 10.00 GiB
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Allocatable NO
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PE Size 0
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Total PE 0
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Free PE 0
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Allocated PE 0
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PV UUID 69d9dd18-36be-4631-9ebb-78f05fe3217f
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```
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### How to Extend the Volume Group
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Use the following command to add a new physical volume to the existing volume group.
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```
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# vgextend vg01 /dev/sdc
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Volume group "vg01" successfully extended
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```
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Use the vgdisplay command to display the PVs you have created.
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```
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# vgdisplay vg01
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--- Volume group ---
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VG Name vg01
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System ID
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Format lvm2
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Metadata Areas 2
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Metadata Sequence No 1
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VG Access read/write
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VG Status resizable
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MAX LV 0
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Cur LV 0
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Open LV 0
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Max PV 0
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Cur PV 2
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Act PV 2
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VG Size 14.99 GiB
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PE Size 4.00 MiB
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Total PE 3840
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Alloc PE / Size 1280 / 4.99
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Free PE / Size 2560 / 9.99 GiB
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VG UUID d17e3c31-e2c9-4f11-809c-94a549bc43b7
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```
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### How to Extend the Logical Volume
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Use the following command to increase the existing logical volume.
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**Common syntax for logical volume extension (lvextend).**
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```
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lvextend [Additional space to be added] [Existing Logical Volume Name]
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```
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Use the below command to increase the existing logical volume additionally to 10GB.
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```
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# lvextend -L +10G /dev/mapper/vg01-lv002
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Rounding size to boundary between physical extents: 5.90 GiB
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Size of logical volume vg01/lv002 changed from 5.00 GiB (1280 extents) to 15.00 GiB (3840 extents).
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Logical volume var successfully resized
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```
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To extend logical volume using PE size’s.
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```
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# lvextend -l +2560 /dev/mapper/vg01-lv002
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```
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To extend the logical volume using percentage (%), use the following command.
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```
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# lvextend -l +40%FREE /dev/mapper/vg01-lv002
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```
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Now, the logical volume is extended and you need to resize the file system to extend the space inside the logical volume.
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For an ext3 and ext4 based file system, run the following command.
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```
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# resize2fs /dev/mapper/vg01-lv002
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```
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For the xfs file system, use the following command.
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```
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# xfs_growfs /dev/mapper/vg01-lv002
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```
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Use the **[df command][3]** to view the file system size.
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```
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# df -h /lvmtest1
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Filesystem Size Used Avail Use% Mounted on
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/dev/mapper/vg01-lv002 15360M 34M 15326M 4% /lvmtest1
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/extend-increase-resize-lvm-logical-volume-in-linux/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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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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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/create-lvm-storage-logical-volume-manager-in-linux/
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[2]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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[3]: https://www.2daygeek.com/linux-check-disk-space-usage-df-command/
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