How to Extend/Reduce LVM’s (Logical Volume Management) in Linux – Part II

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Babin Lonston

I'm Working as a System Administrator for last 10 year's with 4 years experience with Linux Distributions, fall in love with text based operating systems.

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65 Responses

  1. krishna says:

    Hi,

    I have 2 questions any one please give me a answer:

    1. what is the difference between L and l (small) ?
    2. what is the difference between LVresize and LV extend ?

    • Bobin Lonston says:

      @Krishna,

      1. what is the difference between L and l (small)?

      L = Can be used while MB, GB or TB in size
      l = Can be used while resizing or reducing with Physical extent in size (PE), (The default extent size of a single PE is 4 MB).

      2. what is the difference between LVresize and LV extent?

      lvresize = Take an example resizing from 10 GB to 20 GB using existing PEs from the Volume group.
      lvextend = Only used while adding a new device (/dev/sdc or /dev/sdd or whatever ) to existing volume group.

      Thanks & Regards,
      Bobin Lonston

  2. Hans Linkels says:

    I tried reducing the LV on a test system. Worked like breeze. To calculate the PE’s to remove I converted everything to real bytes. That is, PE size of 4MiB = 4 * 1024 * 1024. And the number of GB to remove was 1Gib = 1024 * 1024 * 2014 bytes.

    After resizefs, the space needed by the file system is specified in 4kiB blocks, so 4096 bytes each. If you want to calculate accurately without losing a GB here and there AND you want to be sure not to reduce the LV beyond the size of the file system, I’d recommend this.

  3. Spas says:

    I think the command `resize2fs /dev/vg_tecmint_extra/tecmint_reduce_test 10GB` should be `resize2fs /dev/vg_tecmint_extra/tecmint_reduce_test 10G` –> 10GB produces: invalid new size.

  4. Pratik says:

    We can use lvextend and resize2fs same time with lvextend -r command.

    From the man page:

    -r|–resizefs – Resize underlying filesystem together with the LV using fsadm(8).

  5. sagar says:

    Thanks for sharing the article…Really helpful.

  6. Amiya says:

    Awesome article! Straight to the point.

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