Linux LVM learning Summary-delete a physical volume

Linux LVM learning Summary-delete a physical volume
This article describes the commands vgreduce and pvremove in LVM management. As a matter of fact, the previous articles have been mentioned and involved. Vgreduce: removes physical volumes from an LVM volume group to reduce the volume group capacity. Note: The last physical volume in the LVM volume group cannot be deleted. pvremove: Used to delete an existing physical volume. When you use the pvremove command to delete a physical volume, it deletes the physical volume information on the LVM partition so that it is no longer considered a physical volume. Before deleting a physical volume PV, you must have a clear understanding of the partition information, volume group information, physical volume information, and logical volume information of the server to avoid errors or misoperations.

[root@localhost ~]# fdisk -lDisk /dev/sda: 128.8 GB, 128849018880 bytes255 heads, 63 sectors/track, 15665 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice BootStartEndBlocksId  System/dev/sda1*  1 1310439183  Linux/dev/sda2  14 10443 837789758e  Linux LVM/dev/sda3  10444 15665 4194571583  Linux[root@localhost ~]# vgscan  Reading all physical volumes.  This may take a while...  Found volume group "VolGroup00" using metadata type lvm2[root@localhost ~]# pvscan  PV /dev/sda2VG VolGroup00lvm2 [79.88 GB / 0 free]  PV /dev/sda3VG VolGroup00lvm2 [40.00 GB / 40.00 GB free]  Total: 2 [119.88 GB] / in use: 2 [119.88 GB] / in no VG: 0 [0][root@localhost ~]# pvdisplay  --- Physical volume ---  PV Name/dev/sda2  VG NameVolGroup00  PV Size79.90 GB / not usable 23.41 MB  Allocatable  yes (but full)  PE Size (KByte) 32768  Total PE  2556  Free PE0  Allocated PE 2556  PV UUIDYGtB2J-ZKJr-mV62-NluQ-2DGy-vuUT-cCc1lo  --- Physical volume ---  PV Name/dev/sda3  VG NameVolGroup00  PV Size40.00 GB / not usable 2.61 MB  Allocatable  yes   PE Size (KByte) 32768  Total PE  1280  Free PE1280  Allocated PE 0  PV UUIDwsnv13-7j1H-SH8q-hl6k-HpNc-x4WU-gM7LzW[root@localhost ~]# lvscan  ACTIVE'/dev/VolGroup00/LogVol00' [77.91 GB] inherit  ACTIVE'/dev/VolGroup00/LogVol01' [1.97 GB] inherit[root@localhost ~]# lvs  LV VGAttrLSize  Origin Snap%  Move Log Copy%  Convert  LogVol00 VolGroup00 -wi-ao 77.91G    LogVol01 VolGroup00 -wi-ao  1.97G 

 

Vgreduce parameter:-a: If no physical volume is specified in the command line, delete all empty physical volumes; -- removemissing: Delete the physical volume lost in the volume group, restore the volume group to normal.

[root@localhost ~]# vgreduce VolGroup00 /dev/sda3Removed "/dev/sda3" from volume group "VolGroup00"[root@localhost ~]# clip_image001

 

[root@localhost ~]# pvscan  PV /dev/sda2VG VolGroup00lvm2 [79.88 GB / 0 free]  PV /dev/sda3 lvm2 [40.00 GB]  Total: 2 [119.88 GB] / in use: 1 [79.88 GB] / in no VG: 1 [40.00 GB][root@localhost ~]# pvs  PVVGFmt  Attr PSize  PFree   /dev/sda2  VolGroup00 lvm2 a-79.88G  0   /dev/sda3 lvm2 a-40.00G 40.00G[root@localhost ~]# pvremove /dev/sda3  Labels on physical volume "/dev/sda3" successfully wiped[root@localhost ~]# pvscan  PV /dev/sda2VG VolGroup00lvm2 [79.88 GB / 0 free]  Total: 1 [79.88 GB] / in use: 1 [79.88 GB] / in no VG: 0 [0]