To remove storage from a Volume Group, the command vgreduce is used. Remove a Physical Volume from a Volume Group (vgreduce) From the output you can see the size and associated PV count has increased. After the command was issued, the vgdisplay command was used to display the new attributes of the specified Volume Group. Next the vgextend command is issued along with the specified Physical Volume to use. In the above example, we used the vgdisplay command to display the current size and associated Physical Volumes with the Volume Group " vg_rhel01". Volume group "vg_rhel01" successfully ~]# vgdisplay vg_rhel01 In the following example, we are going to add 2GB of space to the existing Volume Group ~]# vgdisplay vg_rhel01 You also need to supply the name of the Physical Volume (disk) that is going to be added. To add additional space to an existing Volume Group, the command vgextend is used. Volume group "test_vg01" successfully removed
To remove a Volume Group, the command vgremove is ~]# vgremove test_vg01 The command vgs was used to display the before and after results. In the above example, we used the vgrename command to rename the existing Volume Group " vg01" to " test_vg01". Volume group "vg01" successfully renamed to ~]# vgs To rename an existing Volume Group, the vgrename command is ~]# vgs Now when the pvs command is issued, we can see that the storage is now associated with the new Volume Group " ~]# pvs dev/sdc lvm2 a- 2.00g ~]# vgcreate vg01 /dev/sdc
Physical volume "/dev/sdc" successfully ~]# pvs The command pvs is used to show that it is not associated with any existing Volume ~]# pvcreate /dev/sdc Before the newly added disk can be used we use the pvcreate command. In the example below we are using a newly added disk /dev/sdc. You will also need to specify which Physical Volume (PV) is to be associated with the new Volume Group. To create a new Volume Group (VG) you must use the vgcreate command. Labels on physical volume "/dev/sdc" successfully wiped To remove a Physical Volume from a system, you use the pvremove ~]# pvremove /dev/sdc Physical volume "/dev/sdc" successfully created Writing physical volume data to disk "/dev/sdc" To add a new disk into a system that is to be managed by LVM, you must use the command ~]# pvcreate /dev/sdc This command is useful to help identify a disk that has just been added to a system.
Sometimes it is useful to use the command in conjunction with "grep" to limit the output ~]# fdisk -l | grep /dev/sdįrom the above we can see that we have a spare disk on our Red Hat system " /dev/sdc". If you issue the command "fdisk -l" without specifying a disk, then all disk information is displayed. Partition 1 does not end on cylinder boundary. I/O size (minimum/optimal): 512 bytes / 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes To display partition information on a Linux system, you can issue the fdisk -l ~]# fdisk -l /dev/sdaĢ55 heads, 63 sectors/track, 1044 cylinders List Partitions on a Linux system - fdisk To display partition types and disk information on a Linux system, you can use the lsblk ~]# lsblk In the above example the parameter "/dev/vg_rhel01/lv_root" was passed to the lvdisplay command.Īlthough this command is not a LVM command, it us useful for displaying partition information. If you issue the "lvdisplay" command without specifying a specific Logical Volume, then all Logical Volumes on your system will be displayed. LV UUID 2LwbRo-KMuD-DQne-3NMI-Jndp-gClY-Zj3uL0 LV VG Attr LSize Pool Origin Data% Move Log Copy% Convertįor a more detailed display of Logical Volumes on a Linux system you can use the command ~]# lvdisplay /dev/vg_rhel01/lv_root To display Logical Volume (LV) information on a Linux system you can issue the lvs ~]# lvs VG UUID ttO0aF-RgCq-OZM7-dKcj-sDr0-vfg1-TDFzj0ĭisplay Logical Volume Information (lvs and lvdisplay) To display basic information regarding a Volume Group on a Linux system you can issue the vgs ~]# vgsįrom the above output we can see that there are 2 Physical Volumes (PV) assigned to the Volume Group (VG) vg_rhel01įor a more detailed view of Volume Groups on a Linux system, you can use the command ~]# vgdisplay vg_rhel01 PV UUID Q3lBfV-tDi9-LJOw-nZKj-fge1-pqSQ-l0Cuteĭisplay Volume Groups (vgs and vgdisplay) To display more details about a PV, you can issue the pvdisplay ~]# pvdisplay To display Physical Volumes (PV) on a system you can issue the pvs ~]# pvs LVM Command Examples Display Physical Volumes (pvs and pvdisplay)
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