Working with LVM Storage

30 minutes
  • 5 Learning Objectives

About this Hands-on Lab

In this lab, we’re going to go over the LVM management tool. These are skills that will serve you well in your career as a Linux sysadmin. Once complete, you’ll have a solid understanding of how to use these tools.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Create Physical Devices
  1. Get the names of our disks:

    fdisk -l
  2. Create the physical devices:

    pvcreate /dev/xvdg /dev/xvdf
Create a Volume Group

Create a volume group on the physical devices we created in the previous task:

vgcreate RHCSA /dev/xvdg /dev/xvdf
Create a Logical Volume

Create the Logical Volume:

lvcreate -n pinehead -L 3G RHCSA
  • -n denotes the name of the LV.
  • -L denotes the size of the LV.
  • RHCSA is the name of the volume group we’re creating this LV in.
Format the LV as XFS and Mount It Persistently at `/mnt/lvol`
  1. Format the disk as XFS:

    mkfs.xfs /dev/mapper/RHCSA-pinehead
  2. Create a mount point:

    mkdir /mnt/lvol
  3. Get the UUID:

    blkid
  4. Copy the UUID, and edit /etc/fstab.

  5. Create a new line that looks like:

    UUID="THE-UUID-YOU-COPIED" /mnt/lvol xfs defaults 0 0
  6. Save and exit, and then run:

    mount -a
Grow the Mount Point by 200 MB
  1. To grow the LV, run:

    lvextend -L+200M /dev/RHCSA/pinehead

    To have the LVM tools automatically resize the filesystem, you could pass the -r or --resizefs flags.

  2. Another way to resize the filesystem is by running:

    xfs_growfs /mnt/lvol

Additional Resources

Use the credentials and server IP to log in to our lab server. Run sudo -i to become root once you've logged in.

We've been tasked with creating a large logical volume out of the two disks attached to this server. The Volume Group name should be RHCSA. The Logical Volume name should be pinehead and should be 3 GB in size.

Make sure that the resulting logical volume is formatted as XFS and persistently mounted at /mnt/lvol.

After that is complete, we should grow the logical volume and the filesystem by 200 MB.

What are Hands-on Labs

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