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选题[tech]: 20201009 How to Remove Physical Volume from a Volume Group in LVM
sources/tech/20201009 How to Remove Physical Volume from a Volume Group in LVM.md
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How to Remove Physical Volume from a Volume Group in LVM)
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[#]: via: (https://www.2daygeek.com/linux-remove-delete-physical-volume-pv-from-volume-group-vg-in-lvm/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How to Remove Physical Volume from a Volume Group in LVM
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======
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If a device is no longer need for use by LVM, you can use the vgreduce command to remove physical volumes from a volume group.
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The Vgreduce command shrinks the capacity of a volume group by removing a physical volume.
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But make sure that the physical volume is not used by any logical volumes using the pvdisplay command.
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If the physical volume is still being used, you must transfer the data to another physical volume using the pvmove command.
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Once the data is moved, it can be removed from the volume group.
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Finally use the pvremove command to remove the LVM label and LVM metadata on the empty physical volume.
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* **Part-1: [How to Create/Configure LVM (Logical Volume Management) in Linux][1]**
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* **Part-2: [How to Extend/Increase LVM’s (Logical Volume Resize) in Linux][2]**
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* **Part-3: [How to Reduce/Shrink LVM’s (Logical Volume Resize) in Linux][3]**
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![][4]
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### 1) Moving Extents to Existing Physical Volumes
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Use the pvs command to check if the desired physical volume (we plan to remove the **“/dev/sdb1”** disk in LVM) is used or not.
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```
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# pvs -o+pv_used
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PV VG Fmt Attr PSize PFree Used
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/dev/sda1 myvg lvm2 a- 75.00G 14.00G 61.00G
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/dev/sdb1 myvg lvm2 a- 50.00G 45.00G 5.00G
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/dev/sdc1 myvg lvm2 a- 17.15G 12.15G 5.00G
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```
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If this is used, check to see if there are enough free extents on the other physics volumes in the volume group.
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If so, you can run the pvmove command on the device you want to remove. Extents will be distributed to other devices.
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```
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# pvmove /dev/sdb1
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/dev/sdb1: Moved: 2.0%
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…
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/dev/sdb1: Moved: 79.2%
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…
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/dev/sdb1: Moved: 100.0%
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```
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When the pvmove command is complete. Re-use the pvs command to check whether the physics volume is free or not.
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```
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# pvs -o+pv_used
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PV VG Fmt Attr PSize PFree Used
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/dev/sda1 myvg lvm2 a- 75.00G 9.00G 66.00G
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/dev/sdb1 myvg lvm2 a- 50.00G 50.00G 0
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/dev/sdc1 myvg lvm2 a- 17.15G 12.15G 5.00G
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```
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If it’s free, use the vgreduce command to remove the physical volume /dev/sdb1 from the volume group.
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```
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# vgreduce myvg /dev/sdb1
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Removed "/dev/sdb1" from volume group "myvg"
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```
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Finally, run the pvremove command to remove the disk from the LVM configuration. Now, the disk is completely removed from the LVM and can be used for other purposes.
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```
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# pvremove /dev/sdb1
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Labels on physical volume "/dev/sdb1" successfully wiped.
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```
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### 2) Moving Extents to a New Disk
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If you don’t have enough free extents on the other physics volumes in the volume group. Add new physical volume using the steps below.
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Request new LUNs from the storage team. Once this is allocated, run the following commands to **[discover newly added LUNs or disks in Linux][5]**.
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```
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# ls /sys/class/scsi_host
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host0
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```
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```
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# echo "- - -" > /sys/class/scsi_host/host0/scan
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```
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```
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# fdisk -l
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```
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Once the disk is detected in the OS, use the pvcreate command to create the physical volume.
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```
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# pvcreate /dev/sdd1
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Physical volume "/dev/sdd1" successfully created
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```
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Use the following command to add new physical volume /dev/sdd1 to the existing volume group vg01.
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```
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# vgextend vg01 /dev/sdd1
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Volume group "vg01" successfully extended
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```
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Now, use the pvs command to see the new disk **“/dev/sdd1”** that you have added.
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```
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# pvs -o+pv_used
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PV VG Fmt Attr PSize PFree Used
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/dev/sda1 myvg lvm2 a- 75.00G 14.00G 61.00G
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/dev/sdb1 myvg lvm2 a- 50.00G 0 50.00G
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/dev/sdc1 myvg lvm2 a- 17.15G 12.15G 5.00G
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/dev/sdd1 myvg lvm2 a- 60.00G 60.00G 0
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```
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Use the pvmove command to move the data from /dev/sdb1 to /dev/sdd1.
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```
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# pvmove /dev/sdb1 /dev/sdd1
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/dev/sdb1: Moved: 10.0%
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…
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/dev/sdb1: Moved: 79.7%
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…
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/dev/sdb1: Moved: 100.0%
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```
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After the data is moved to the new disk. Re-use the pvs command to check whether the physics volume is free.
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```
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# pvs -o+pv_used
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PV VG Fmt Attr PSize PFree Used
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/dev/sda1 myvg lvm2 a- 75.00G 14.00G 61.00G
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/dev/sdb1 myvg lvm2 a- 50.00G 50.00G 0
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/dev/sdc1 myvg lvm2 a- 17.15G 12.15G 5.00G
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/dev/sdd1 myvg lvm2 a- 60.00G 10.00G 50.00G
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```
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If it’s free, use the vgreduce command to remove the physical volume /dev/sdb1 from the volume group.
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```
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# vgreduce myvg /dev/sdb1
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Removed "/dev/sdb1" from volume group "myvg"
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```
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Finally, run the pvremove command to remove the disk from the LVM configuration. Now, the disk is completely removed from the LVM and can be used for other purposes.
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```
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# pvremove /dev/sdb1
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Labels on physical volume "/dev/sdb1" successfully wiped.
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-remove-delete-physical-volume-pv-from-volume-group-vg-in-lvm/
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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]: https://www.2daygeek.com/extend-increase-resize-lvm-logical-volume-in-linux/
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[3]: https://www.2daygeek.com/reduce-shrink-decrease-resize-lvm-logical-volume-in-linux/
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[4]: data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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[5]: https://www.2daygeek.com/scan-detect-luns-scsi-disks-on-redhat-centos-oracle-linux/
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