RHCSA Study Questions with 100% Correct Answers
List the order of the layers involved in the LVM architecture - Answer️️ -
1. Physical Volume(PV)
2. Volume Group(VG)
3. Logical Volume(LV)
What do you need to do before you create a physical volume? -
Answer️️ -You need to create a part...
List the order of the layers involved in the LVM architecture - Answer✔️✔️-
1. Physical Volume(PV)
2. Volume Group(VG)
3. Logical Volume(LV)
What do you need to do before you create a physical volume? -
Answer✔️✔️-You need to create a partition marked as the LVM partition
type. In fdisk or gdisk you need to press t to change the partition type.
MBR disk is 8e, GUID is 8300
What command verifies the physical volumes that were created? -
Answer✔️✔️-pvs
What command shows details about the physical volume? - Answer✔️✔️-
pvdisplay
What command gives a hierarchical overview of which disks and partitions
are in the LVM volume groups and logical volumes? - Answer✔️✔️-lsblk
How do you create a volume of the first partition of the the sdb disk? You
want to call the volume vgdata. - Answer✔️✔️-vgcreate vgdata /dev/sdb1
Give the two commands that will allow you to see the volume group -
Answer✔️✔️-vgs - Shows a summary of available volume groups
vgdisplay - Shows a detailed list of volume groups and their properties
Show the command you would use to create a logical volume of half the
physical volume vgdata. Name the logical volume lvvol01 - Answer✔️✔️-
lvcreate -n lvvol01 -l 50%FREE vgdata
Show the command you would use to remove the logical volume lvvol01.
That logical volume resides in the physical volume vgdata. - Answer✔️✔️-
lvremove /dev/vgdata/lvvol01
Show the command you would use to create a logical volume of 500
megabyte in the physical volume vgdata. Name the logical volume lvvol01
- Answer✔️✔️-lvcreate -n lvvol01 -L 500M vgdata
Show the commands you would use to show the logical volumes -
Answer✔️✔️-lvs - Shows a summary of all available logical volumes
lvdisplay - Shows a detailed list of available logical volumes and their
properties
What would the name of the LV called lvvol01 in the Physical Volume
vgdata be called the the device mapper name? - Answer✔️✔️-
/dev/mapper/vgdata-lvvol01
If you want to make an XFS file system out of the logical volume lvvol01 in
the PV vgdata, what is the command? - Answer✔️✔️-mkfs.xfs
/dev/vgdata/lvvol01
If you want to make an EXT4 file system out of the logical volume lvvol01
in the PV vgdata, what is the command? - Answer✔️✔️-mkfs.ext4
/dev/vgdata/lvvol01
What file systems can only be increased and what file systems can be
increased and reduced? - Answer✔️✔️-XFS - can only be increased
EXT4 - can be increased and decreased
Btrfs - can be increased and decreased
If you are going to reduce an EXT4 file system, what state must it be in? -
Answer✔️✔️-You can only reduce the volume when it is offline
I want to add 250 megabytes to the file system /dev/vgdata/lvvol01.
Show the command - Answer✔️✔️-lvresize -L +250M -r
/dev/vgdata/lvvol01
I want to reduce the EXT4 file system by 250 megabytes. The LV is lvvol01,
VG is vgdata and the mount point is /files - Answer✔️✔️-1. umount /files
2. lvreduce -L -250M -r /dev/vgdata/lvvol01
I want to resize the LV to 75 percent of the Volume group. The LV is
lvvol01, VG is vgdata and the mount point is /files - Answer✔️✔️-lvresize -r
-l 75%VG /dev/vgdata/lvvol01
I want to reduce the logical volume to 750 MB. LV is lvvol01 and VG is
vgdata. Show the command you would use - Answer✔️✔️-lvreduce -r -l
750M /dev/vgdata/lvvol01
I want to remove the physical volume /dev/sdb2 out of the volume group
vgdata, show the command you would use - Answer✔️✔️-vgredeuce vgdata
/dev/sdb2
Which command shows the current version of RHEL you are using?
a. uname -r
b. cat /proc/rhel-version
c. cat /etc/redhat-release
d. uname -k - Answer✔️✔️-C
[root@client ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
Which command enables you to find the actual version of the kernel that is
used?
a. uname -r
b. uname -v
c. procinfo -k
d. procinfo -l - Answer✔️✔️-A
[root@client ~]# uname -r
3.10.0-957.12.2.el7.x86_64
What is the name of the process that helps the kernel initializing hardware
devices properly?
a. systemd-udevd
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