What can the Logical Volume Manager (LVM) be used for? (Choose THREE correct answers.)
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A. B. C. D. E.BDE
Logical Volume Manager (LVM) is a tool that provides a flexible way to manage storage on Linux systems. It allows administrators to manage hard disks and storage devices as logical volumes, which can be resized and moved around without the need to unmount and remount filesystems. LVM is commonly used in enterprise environments and data centers to manage large storage systems.
The correct answers to the question are B, D, and E:
B. To dynamically change the size of logical volumes: One of the primary benefits of LVM is its ability to dynamically resize logical volumes. This allows administrators to adjust storage capacity as needed without the need to shut down or reboot the system. For example, if a filesystem is running low on space, an administrator can add more physical storage to the logical volume and then resize the filesystem to make use of the additional space.
D. To create snapshots: Another useful feature of LVM is the ability to create snapshots of logical volumes. A snapshot is a point-in-time copy of a logical volume that can be used for backups or for testing changes to the system without affecting the original data. Snapshots can be created quickly and without the need to unmount or shut down the system.
E. To dynamically create or delete logical volumes: LVM allows administrators to create or delete logical volumes dynamically. This provides a lot of flexibility in managing storage, as new logical volumes can be created as needed to store additional data, and old ones can be deleted when they are no longer needed. This allows storage to be optimized for the needs of the system.
A. To create RAID 9 arrays: This answer is incorrect. LVM is not used to create RAID 9 arrays. RAID 9 is not a standard RAID level, and LVM does not provide RAID functionality. RAID levels are typically managed through software or hardware RAID controllers.
C. To encrypt logical volumes: This answer is also incorrect. While LVM supports encryption, it is not its primary function. Encryption is typically handled by separate tools, such as dm-crypt.
In summary, Logical Volume Manager (LVM) can be used to dynamically change the size of logical volumes, create snapshots of logical volumes, and dynamically create or delete logical volumes. It is not used to create RAID 9 arrays, and while it supports encryption, it is not its primary function.