RHCSA Rapid Track

Instructions

On the serverb machine, the serverb_01_lv logical volume that is mounted on the /storage/data1 directory is running out of disk space, and must be extended to 768 MiB. You must ensure that the serverb_01_lv LV remains persistently mounted on the /storage/data1 directory.

The serverb_01_lv LV is present on the serverb_01_vg volume group. It has insufficient space to extend the existing logical volume. A 512 MiB partition exists on the /dev/vdb disk. Create a partition with the 512 MiB size on the /dev/vdb disk.

Create the serverb_02_lv LV with 128 MiB. Create the XFS file system on the newly created volume. Mount the newly created logical volume on the /storage/data2 directory.

1. Create a 512 MiB partition on the /dev/vdb disk. Initialize this partition as a physical volume, and extend the serverb_01_vg volume group to use this partition.

   1. Log in to the serverb machine as the student user and switch to the root user.

      [student@workstation ~]$ ssh student@serverb
      ...output omitted...
      [student@serverb ~]$ sudo -i
      [sudo] password for student: student
      [root@serverb ~]#

   2. Print the partition sizes in MiB to determine where the first partition ends.

      [root@serverb ~]# parted /dev/vdb unit MiB print
      ...output omitted...
      
      Number  Start    End     Size    File system  Name     Flags
       1      1.00MiB  513MiB  512MiB               primary

   3. Create the 512 MiB partition and set the lvm partition type.

      [root@serverb ~]# parted /dev/vdb mkpart primary 514MiB 1026MiB
      ...output omitted...
      [root@serverb ~]# parted /dev/vdb set 2 lvm on

   4. Register the new partition with the kernel.

      [root@serverb ~]# udevadm settle

   5. Initialize the partition as a PV.

      [root@serverb ~]# pvcreate /dev/vdb2
        Physical volume "/dev/vdb2" successfully created.

   6. Extend the serverb_01_vg VG by using the new /dev/vdb2 PV.

      [root@serverb ~]# vgextend serverb_01_vg /dev/vdb2
        Volume group "serverb_01_vg" successfully extended

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2. Extend the serverb_01_lv logical volume to 768 MiB.

   1. Extend the serverb_01_lv LV to 768 MiB.

      Alternatively, you can also use the lvcreate command -L +512M option to resize the LV.

      [root@serverb ~]# lvextend -L 768M /dev/serverb_01_vg/serverb_01_lv
        Size of logical volume serverb_01_vg/serverb_01_lv changed from 256.00 MiB (64 extents) to 768.00 MiB (192 extents).
        Logical volume serverb_01_vg/serverb_01_lv successfully resized.

   2. Extend the XFS file system to consume the remaining space on the LV.

      [root@serverb ~]# xfs_growfs /storage/data1
      meta-data=/dev/mapper/serverb_01_vg-serverb_01_lv isize=512    agcount=4, agsize=16384 blks
      ...output omitted...
      data blocks changed from 65536 to 196608

      Note

      The xfs_growfs command introduces an extra step to extend the file system. An alternative would be to use the lvextend command -r option.

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3. In the existing volume group, create the serverb_02_lv logical volume with 128 MiB. Add an XFS file system and mount it persistently on the /storage/data2 directory.

   1. Create the serverb_02_lv LV with 128 MiB from the serverb_01_vg VG.

      [root@serverb ~]# lvcreate -n serverb_02_lv -L 128M serverb_01_vg
        Logical volume "serverb_02_lv" created.

   2. Create the xfs file system on the serverb_02_lv LV.

      [root@serverb ~]# mkfs -t xfs /dev/serverb_01_vg/serverb_02_lv
      ...output omitted...

   3. Create the /storage/data2 directory as the mount point.

      [root@serverb ~]# mkdir /storage/data2

   4. Add the following line to the end of the /etc/fstab file:

      /dev/serverb_01_vg/serverb_02_lv /storage/data2 xfs defaults 0 0

   5. Update the systemd daemon with the new /etc/fstab configuration file.

      [root@serverb ~]# systemctl daemon-reload

   6. Mount the serverb_02_lv LV.

      [root@serverb ~]# mount /storage/data2

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4. Verify that the newly created LV is mounted with the intended size.

   1. Use the df command to verify the serverb_01_lv LV size.

      [root@serverb ~]# df -h /storage/data1
      Filesystem                               Size  Used Avail Use% Mounted on
      /dev/mapper/serverb_01_vg-serverb_01_lv  763M   19M  744M   3% /storage/data1

   2. Verify the serverb_02_lv LV size.

      [root@serverb ~]# df -h /storage/data2
      Filesystem                               Size  Used Avail Use% Mounted on
      /dev/mapper/serverb_01_vg-serverb_02_lv  123M  7.6M  116M   7% /storage/data2

   3. Verify the serverb_01_lv LV details.

      [root@serverb ~]# lvdisplay /dev/serverb_01_vg/serverb_01_lv
        --- Logical volume ---
        LV Path                /dev/serverb_01_vg/serverb_01_lv
        LV Name                serverb_01_lv
        VG Name                serverb_01_vg
        LV UUID                1pY3DZ-fs1F-mptC-fL32-e8tG-PFBT-bs7LSJ
        LV Write Access        read/write
        LV Creation host, time serverb.lab.example.com, 2022-05-05 14:40:51 -0400
        LV Status              available
        # open                 1
        LV Size                768.00 MiB
        Current LE             192
        Segments               2
        Allocation             inherit
        Read ahead sectors     auto
        - currently set to     8192
        Block device           253:0

   4. Verify the serverb_02_lv LV details.

      [root@serverb ~]# lvdisplay /dev/serverb_01_vg/serverb_02_lv
        --- Logical volume ---
        LV Path                /dev/serverb_01_vg/serverb_02_lv
        LV Name                serverb_02_lv
        VG Name                serverb_01_vg
        LV UUID                0aJIb6-Ti2b-jLCk-imB6-rkLx-mUoX-acjkz9
        LV Write Access        read/write
        LV Creation host, time serverb.lab.example.com, 2022-05-05 14:45:46 -0400
        LV Status              available
        # open                 1
        LV Size                128.00 MiB
        Current LE             32
        Segments               1
        Allocation             inherit
        Read ahead sectors     auto
        - currently set to     8192
        Block device           253:1

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