RHCSA 8 EX200 Exam Practice Question 11 (VDO Management In Linux)

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RHCSA 8 EX200 Exam Practice Question 11

Question

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You have been provided with a disk drive attached to your system (/dev/sdc). create a VDO volume with the name (class1_vdo) and a logical size of 30GB.

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Format the VDO volume with the xfs filesystem, mount it on /class1_mnt and make it persistent across reboot.

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The question is based on configuring & managing VDO volume in the RHCSA 8 Course on this website. If you have gone through this course, solving this wouldn’t be a problem.

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Installing, configuring and Managing VDO in Linux

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Answer

1. Verify if the vdo service, and kmod-vdo module are installed.

[root@DRDEV1 ~]# rpm -q vdo kmod-kvdo

vdo-6.2.3.114-14.el8.x86_64
kmod-kvdo-6.2.3.114-74.el8.x86_64
[root@DRDEV1 ~]#

If they aren’t installed, you need to install by using the command,

# yum install vdo kmod-kvdo -y

OR

# dnf install vdo kmod-kvdo -y

2. Make sure that the VDO service is started and enabled.

[root@DRDEV1 ~]# systemctl enable --now vdo

3. create the VDO volume on sdc

verify the sdc device.

[root@DRDEV1 ~]# lsblk /dev/sdc

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdc    8:32   0  10G  0 disk

Create the VDO volume

[root@DRDEV1 ~]# vdo create --name=class1_vdo --device=/dev/sdc --vdoLogicalSize=30G

Creating VDO class1_vdo
      The VDO volume can address 6 GB in 3 data slabs, each 2 GB.
      It can grow to address at most 16 TB of physical storage in 8192 slabs.
      If a larger maximum size might be needed, use bigger slabs.
Starting VDO class1_vdo
Starting compression on VDO class1_vdo
VDO instance 1 volume is ready at /dev/mapper/class1_vdo

[root@DRDEV1 ~]# vdo list

class1_vdo

4. Format the VDO volume with the XFS filesystem.

[root@DRDEV1 ~]# mkfs.xfs -K /dev/mapper/class1_vdo

meta-data=/dev/mapper/class1_vdo isize=512    agcount=4, agsize=1966080 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=7864320, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=3840, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

5. create the mount point, class1_mnt

[root@DRDEV1 ~]# mkdir /class1_mnt

6. Map the VDO volume to the mount point.

[root@DRDEV1 ~]# mount /dev/mapper/class1_vdo /class1_mnt/

7. Verify it’s been mounted.

[root@DRDEV1 ~]# df -h /class1_mnt/

Filesystem              Size  Used Avail Use% Mounted on
/dev/mapper/class1_vdo   30G  247M   30G   1% /class1_mnt

8. To make the volume persistent, we need to input the UUID to the fstab file.

get the UUID of the VDO volume

[root@DRDEV1 ~]# blkid -p /dev/mapper/class1_vdo

/dev/mapper/class1_vdo: UUID="8d1542c5-77eb-4f02-ae93-3bcd04057f0e" TYPE="xfs" USAGE="filesystem"

input the UUID to the fstab file.

[root@DRDEV1 ~]# vim /etc/fstab

UUID=8d1542c5-77eb-4f02-ae93-3bcd04057f0e /class1_mnt  xfs   defaults,x-systemd.requires=vdo.service 0 0

9. do “mount -a” to verify your fstab file is fine.

[root@DRDEV1 ~]# mount -a

10. reboot your system if you wish.

[root@DRDEV1 ~]# reboot

Solution Summary

rpm -q vdo kmod-kvdo

systemctl enable –now vdo

lsblk /dev/sdc

vdo create –name=class1_vdo –device=/dev/sdc –vdoLogicalSize=30G

vdo list

mkfs.xfs -K /dev/mapper/class1_vdo

mkdir /class1_mnt

mount /dev/mapper/class1_vdo /class1_mnt/

blkid -p /dev/mapper/class1_vdo

vim /etc/fstab

mount -a

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