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List the order of the layers involved in the LVM architecture - 1. Physical Volume(PV)

2. Volume Group(VG)

3. Logical Volume(LV)



What do you need to do before you create a physical volume? - 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? - pvs



What command shows details about the physical volume? - pvdisplay



What command gives a hierarchical overview of which disks and partitions are in the LVM volume
groups and logical volumes? - lsblk



How do you create a volume of the first partition of the the sdb disk? You want to call the volume
vgdata. - vgcreate vgdata /dev/sdb1



Give the two commands that will allow you to see the volume group - 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 - 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. - 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 - lvcreate -n lvvol01 -L 500M vgdata



Show the commands you would use to show the logical volumes - 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? - /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? - 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? - mkfs.ext4 /dev/vgdata/lvvol01



What file systems can only be increased and what file systems can be increased and reduced? - 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? - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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

b. hwinit

c. udev

, d. udevd -



Where does your system find the default rules that are used for initializing

new hardware devices?

a. /etc/udev/rules.d

b. /usr/lib/udev/rules.d

c. /usr/lib/udev.d/rules

d. /etc/udev.d/rules - A



/etc/udev/rules.d



Which command should you use to unload a kernel module, including all of

its dependencies?

a. rmmod

b. insmod -r

c. modprobe -r

d. modprobe - c



modprobe -r



Which command enables you to see whether the appropriate kernel modules

have been loaded for hardware in your server?

a. lsmod

b. modprobe -l

c. lspci -k

d. lspci -



Where do you specify a kernel module parameter to make it persistent?

a. /etc/modules.conf

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