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    Monday, March 24, 2014

    How to remove logical and physical volume from Volume Group in Linux

    Remove Logical Volume from Volume Group


    NOTE: Make sure the logical volume to be removed is unmounted.

    Syntax:
    # lvremove /path/to/lvm
    Once the logical volume is unmounted run the below command from the terminal
    # lvremove /dev/NewGroup/office
    Do you really want to remove active logical volume office? [y/n]: y
      Logical volume "office" successfully removed

    Verify the changes (As you see "office" logical volume is successfully deleted)
    [root@test2 ~]# lvdisplay
      --- Logical volume ---
      LV Path                /dev/NewGroup/root
      LV Name                root
      VG Name                NewGroup
      LV UUID                52mm9d-feyC-AWVH-NTMC-VwNa-Ns1p-cJc8vJ
      LV Write Access        read/write
      LV Creation host, time test2.example, 2014-03-14 02:37:58 +0530
      LV Status              available
      # open                 1
      LV Size                9.92 GiB
      Current LE             2539
      Segments               1
      Allocation             inherit
      Read ahead sectors     auto
      - currently set to     256
      Block device           253:0
    
      --- Logical volume ---
      LV Path                /dev/NewGroup/swap
      LV Name                swap
      VG Name                NewGroup
      LV UUID                48hszS-I0uT-Zsxr-jnoY-yEbj-hfBJ-isofU7
      LV Write Access        read/write
      LV Creation host, time test2.example, 2014-03-14 02:38:00 +0530
      LV Status              available
      # open                 1
      LV Size                1.95 GiB
      Current LE             500
      Segments               1
      Allocation             inherit
      Read ahead sectors     auto
      - currently set to     256
      Block device           253:1

    Remove Physical Volume from Volume Group


    Verify the physical volume to be removed
    # vgdisplay -v
        Finding all volume groups
        Finding volume group "VolGroup"
      --- Volume group ---
      VG Name               VolGroup
      System ID
      Format                lvm2
      Metadata Areas        2
      Metadata Sequence No  25
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                2
      Open LV               2
      Max PV                0
      Cur PV                2
      Act PV                2
      VG Size               10.81 GiB
      PE Size               4.00 MiB
      Total PE              2767
      Alloc PE / Size       2265 / 8.85 GiB
      Free  PE / Size       502 / 1.96 GiB
      VG UUID               uH5AP5-b24E-92h7-nL8b-7Bio-fXe3-pstWIW
    
      --- Logical volume ---
      LV Path                /dev/VolGroup/root
      LV Name                root
      VG Name                VolGroup
      LV UUID                Qn8TnI-TLNm-rl4Y-ORnd-zU3p-2Kj1-ALSLAg
      LV Write Access        read/write
      LV Creation host, time ,
      LV Status              available
      # open                 1
      LV Size                6.85 GiB
      Current LE             1753
      Segments               2
      Allocation             inherit
      Read ahead sectors     auto
      - currently set to     256
      Block device           253:0
    
      --- Logical volume ---
      LV Path                /dev/VolGroup/swap
      LV Name                swap
      VG Name                VolGroup
      LV UUID                M1ucwx-2sjb-o9Q4-a2td-aPvi-FO1C-ggHuPn
      LV Write Access        read/write
      LV Creation host, time ,
      LV Status              available
      # open                 1
      LV Size                2.00 GiB
      Current LE             512
      Segments               1
      Allocation             inherit
      Read ahead sectors     auto
      - currently set to     256
      Block device           253:1
    
      --- Physical volumes ---
      PV Name               /dev/sda2
      PV UUID               uYfzd6-4jh1-YTP7-I3hx-WdSJ-4mTR-HZcdtq
      PV Status             allocatable
      Total PE / Free PE    2509 / 244
    
      PV Name               /dev/sdb1
      PV UUID               Am341r-9WLV-NgWo-Un0Y-sVLQ-fyXM-0zyDix
      PV Status             allocatable
      Total PE / Free PE    258 / 258
    As you can see my VolGroup contains /dev/sda2 and /dev/sdb1 partition. Let us try to remove /dev/sdb1

    To remove a Physical Volume first we need to remove it from the Volume group using below syntax

    Syntax:
    # vgreduce name_of_vol_grp  path/of/pv
    # vgreduce VolGroup /dev/sdb1
     
    Removed "/dev/sdb1" from volume group "VolGroup"

    Once reduce from volgroup we can easily remove the PV using below command
    # pvremove /dev/sdb1
     
    Labels on physical volume "/dev/sdb1" successfully wiped

    I hope I made my self clear. Please let me know your success and failures.


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    How to rename Logical Volume and Volume Group in Linux

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