Chapitre 3. Managing LVM volume groups

Procédure

1. Create a volume group:

   # vgcreate myvg /dev/vdb1 /dev/vdb2
    Volume group "myvg" successfully created.

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   This creates a VG with the name of myvg. The PVs /dev/vdb1 and /dev/vdb2 are the base storage level for the myvg VG .

2. View the created volume groups by using any one of the following commands according to your requirement:

   1. The vgs command provides volume group information in a configurable form, displaying one line per volume groups:

      # vgs
        VG    #PV #LV #SN  Attr  VSize   VFree
       myvg   2    0   0   wz-n  159.99g 159.99g

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   2. The vgdisplay command displays volume group properties such as size, extents, number of physical volumes, and other options in a fixed form. The following example shows the output of the vgdisplay command for the volume group myvg. To display all existing volume groups, do not specify a volume group:

      # vgdisplay myvg
        --- Volume group ---
        VG Name               myvg
        System ID
        Format                lvm2
        Metadata Areas        4
        Metadata Sequence No  6
        VG Access             read/write
      [..]

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   3. The vgscan command scans all supported LVM block devices in the system for volume group:

      # vgscan
        Found volume group "myvg" using metadata type lvm2

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3. Optional: Increase a volume group’s capacity by adding one or more free physical volumes:

   # vgextend myvg /dev/vdb3
   Physical volume "/dev/vdb3" successfully created.
   Volume group "myvg" successfully extended

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4. Optional: Rename an existing volume group:

   # vgrename myvg myvg1
   Volume group "myvg" successfully renamed to "myvg1"

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