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

The correct procedure is to first initialize the new disk as a physical volume using `pvcreate`. Then, the volume group must be extended to include this new physical volume with `vgextend`. After the volume group has more space, the logical volume can be extended to use the available free space using `lvextend`. Finally, the filesystem on the logical volume must be resized to recognize and use the additional space; this is done with `xfs_growfs` for XFS filesystems or `resize2fs` for ext2/3/4 filesystems.

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

The `lvcreate` command is used to create a new logical volume. The `-L` option specifies the size of the logical volume (10G), and the `-n` option specifies its name (lv_web). The final argument is the name of the volume group from which to allocate the space (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

Before a logical volume can be removed, it must be unmounted. The `umount` command is used to unmount the filesystem. After it's unmounted and no longer in use, the `lvremove` command can be used to safely delete the logical volume.

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

LVM works by creating a pool of storage space called a Volume Group (VG) from one or more Physical Volumes (PVs), which can be whole disks or partitions. From this VG, you can create Logical Volumes (LVs), which function as virtual partitions that can be easily managed and resized.

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

After a logical volume is created with `lvcreate`, it is just a raw block device. The next step is to create a filesystem on it using a command like `mkfs.xfs` or `mkfs.ext4`. Once the filesystem exists, the logical volume can be mounted to a directory to make it accessible for storing files.

RHCSA Exam Practice Test

RHCSA Exam Practice Test

RHCSA LVM Storage Management Questions and Answers