LVM – Logical Volume Manager

This set of multiple choice SAN storage questions and answers focuses on Logical Volume Manager.

1. A “Logical Volume Manager” helps in
a) Virtualizing storage
b) provide direct access to the underlying storage
c) Manage disk space efficiently without having to know the actual hardware details
d) Both storage virtualization and efficient disk space management

2. Physical Volumes are
a) The space on a physical storage that represent a logical volume
b) Disk or disk partitions used to construct logical volumes
c) A bunch of disks put together that can be made into a logical volume
d) None of the mentioned

3. Which of the following are true. Logical Volumes _____
a) Can span across multiple volume groups
b) Can span across multiple physical volumes
c) Can be constructed only using a single physical disk
d) None of the mentioned

a) PE resides on a disk, whereas LE resides on a logical volume
b) LE is larger in size than a PE
c) LE’s are unique whereas PE’s are not
d) A LE can map to more than one PE

5. Which of the following statement is false?
a) LVM is storage independent whereas a RAID system is limited to the storage subsystem
b) LVM provides snapshot feature
c) With LVM we can grow volumes to any size
d) RAID system can provide more storage space than a LVM

6. LVM is independent of device IDs because
a) LVM uses it’s own device naming to identify a physical disk
b) LVM stores the volume management information on the disks that helps it reconstruct volumes
c) LVM is an abstraction layer over physical devices and does not need device ids
d) Device ids are used only by the device drivers

7. Concatenation is the technique of
a) Adding physical volumes together to make a volume group
b) Filling up a physical volume completely before writing to the next one in a logical volume
c) writing a block of data onto one disk and then a block onto another disk in an alternate fashion
d) Increasing the size of a volume by adding more disks

8. Which of the following is not a feature of LVM
a) Independent of disk location
b) Concatenation and striping of storage systems
c) Protection against disk failures
d) Snapshot capability

9. LVM does not incur much performance overheads because
a) The writes/reads happen only to logical devices
b) The mapping of logical to physical storage is kept in RAM
c) The time lost in mapping devices is gained by writing to disks in parallel
d) None of the mentioned

10. VGDA represents
a) The data stored on the logical volume
b) The data stored on physical volume
c) LVM configuration data stored on each physical volume
d) None of the mentioned