RH134 - ch08s05

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Lab: Manage Storage Stack

In this lab, you resize an existing logical volume, add LVM resources as necessary, and then add a new logical volume with a persistently mounted XFS file system on it.

Outcomes

Resize the serverb_01_lv logical volume to 768 MiB.
Create the serverb_02_lv logical volume with 128 MiB with an XFS file system.
Persistently mount the volume on the /storage/data2 directory.

As the student user on the workstation machine, use the lab command to prepare your system for this exercise.

This command prepares your environment and ensures that all required resources are available.

[student@workstation ~]$ lab start lvm-review

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.

Important

Note especially the specification of the partition size in MiB (2²⁰ bytes). If you create the partition in MB (10⁶ bytes), it does not satisfy the evaluation criteria, because 1 MiB = 1.048576 MB.

Although the default unit when using the parted /dev/vdb print command is MB, you can verify the size of the /dev/vdb device partitions in MiB units. Use the parted /dev/vdb unit MiB print command to print the partition sizes in MiB.

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.

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.

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

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

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

Initialize the partition as a PV.

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

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

Extend the serverb_01_lv logical volume to 768 MiB.

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.

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.

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.
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.
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...
Create the /storage/data2 directory as the mount point.
[root@serverb ~]# mkdir /storage/data2
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
Update the systemd daemon with the new /etc/fstab configuration file.
[root@serverb ~]# systemctl daemon-reload
Mount the serverb_02_lv LV.
[root@serverb ~]# mount /storage/data2

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

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

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

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

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

Evaluation

As the student user on the workstation machine, use the lab command to grade your work. Correct any reported failures and rerun the command until successful.

[student@workstation ~]$ lab grade lvm-review

Finish

On the workstation machine, change to the student user home directory and use the lab command to complete this exercise. This step is important to ensure that resources from previous exercises do not impact upcoming exercises.

[student@workstation ~]$ lab finish lvm-review

This concludes the section.

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jennifer1987

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Red Hat System Administration II (RH134)

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Build the skills to perform the key tasks needed to become a full-time Linux administratorRed Hat System Administration II (RH134) is the second part of the RHCSA training track for IT professionals who have already attended Red Hat System Administration I. The course goes deeper into core Linux system administration skills in storage configuration and management, installation and deployment of Red Hat Enterprise Linux, management of security features such as SELinux, control of recurring system tasks, management of the boot process and troubleshooting, basic system tuning, and command-line automation and productivity. This course assumes that students have attended Red Hat System Administration I (RH124).Experienced Linux administrators who seek rapid preparation for the RHCSA certification should instead start with RHCSA Rapid Track (RH199).This course is based on Red Hat Enterprise Linux 9.0.Course summaryInstall Red Hat Enterprise Linux using scalable methodsAccess security files, file systems, and networksExecute shell scripting and automation techniquesManage storage devices, logical volumes, and file systemsManage security and system accessControl the boot process and system servicesRun containersAudience for this courseThis course is geared toward Windows system administrators, network administrators, and other system administrators who are interested in supplementing current skills or backstopping other team members, in addition to Linux system administrators who are responsible for these tasks:Configuring, installing, upgrading, and maintaining Linux systems using established standards and proceduresProviding operational supportManaging systems for monitoring system performance and availabilityWriting and deploying scripts for task automation and system administrationRecommended trainingSuccessful completion of Red Hat System Administration I (RH124) is recommended.Experienced Linux administrators seeking to accelerate their path toward becoming a Red Hat Certified System Administrator should start with the RHCSA Rapid Track course (RH199).Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technology requirements.This course is not designed for bring your own device (BYOD).Internet access is not required, but is recommended to allow students to research and access Red Hat online resources.

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