RHCSA LVM Storage Management Questions and Answers

Question 1

A logical volume named `lv_data` in the volume group `vg_apps` is almost full.
A new physical disk, `/dev/sdd`, has been added to the system to provide more space.
Which of the following sequences of commands correctly extends the logical volume to use the new disk?

Accepted Answer

1. `pvcreate /dev/sdd`
2. `vgextend vg_apps /dev/sdd`
3. `lvextend -l +100%FREE /dev/vg_apps/lv_data`
4. `xfs_growfs /mount/point` or `resize2fs /dev/vg_apps/lv_data`

Answer

1. `vgextend vg_apps /dev/sdd`
2. `pvcreate /dev/sdd`
3. `lvextend -l +100%FREE /dev/vg_apps/lv_data`
4. `xfs_growfs /mount/point`

Answer

1. `pvcreate /dev/sdd`
2. `lvextend -l +100%FREE /dev/vg_apps/lv_data /dev/sdd`
3. `vgextend vg_apps /dev/sdd`
4. `resize2fs /dev/vg_apps/lv_data`

Answer

1. `lvcreate -l +100%FREE /dev/vg_apps/lv_data`
2. `vgextend vg_apps /dev/sdd`
3. `pvcreate /dev/sdd`
4. `xfs_growfs /mount/point`

Question 2

Which command is used to create a new logical volume named `lv_web` of size 10 Gigabytes from a volume group named `vg_data`?

Accepted Answer

C. `lvcreate -L 10G -n lv_web vg_data`

Answer

A. `vgcreate -n lv_web -L 10G vg_data`

Answer

B. `lvnew -s 10G -n lv_web vg_data`

Answer

D. `pvcreate -L 10G -n lv_web vg_data`

Question 3

A system administrator needs to remove a logical volume `/dev/vg01/lv01` which is currently mounted on `/data`. What is the correct procedure to safely remove the logical volume?

Accepted Answer

C. `umount /data` followed by `lvremove /dev/vg01/lv01`

Answer

A. `lvremove /dev/vg01/lv01` followed by `umount /data`

Answer

B. `vgremove vg01`

Answer

D. `lvreduce -L 0 /dev/vg01/lv01` followed by `umount /data`

Question 4

Which of the following describes the fundamental relationship between Physical Volumes (PVs), Volume Groups (VGs), and Logical Volumes (LVs) in LVM?

Accepted Answer

D. Physical Volumes are pooled together to create a Volume Group, from which Logical Volumes can be created.

Answer

A. Logical Volumes are grouped together to form a Volume Group, which is then stored on a single Physical Volume.

Answer

B. Physical Volumes are combined into a Logical Volume, which is then partitioned into multiple Volume Groups.

Answer

C. Physical Volumes are abstract layers on top of Volume Groups, which contain the actual Logical Volumes.

Question 5

A sysadmin has created a logical volume and now needs to make it usable by the operating system. What are the next two essential steps after using `lvcreate`?

Accepted Answer

A. Create a filesystem on the LV, then mount it.

Answer

B. Mount the LV, then create a filesystem on it.

Answer

C. Add the LV to `/etc/fstab`, then run `pvcreate` on it.

Answer

D. Run `vgextend` on the LV, then mount it.

Question 6

You need to reduce the size of a logical volume named `data_lv` in the `corp_vg` volume group. The volume is formatted with an ext4 filesystem. What is a critical prerequisite before running the `lvreduce` command?

Accepted Answer

B. The filesystem must be resized to be smaller than or equal to the new LV size.

Answer

A. The Volume Group must be deactivated.

Answer

C. The logical volume must be snapshotted.

Answer

D. The physical volumes in the group must be defragmented.