Storage Review Questions

Q. Where is the partition table information stored on BIOS-based systems? A. The partition table information is stored on the Master Boot Record.

Q. What is the name of the technology that VDO employs to remove randomization of data blocks? A. VDO employs thin provisioning technology to remove data block randomization.

Q. What would sdd3 represent? A. sdd3 represents the third partition on the fourth disk.

Q. Provide the command to add physical volumes /dev/sdd1 and /dev/sdc to vg20 volume group. A. vgextend vg20 /dev/sdd1 /dev/sdc

Q. What are the two commands that you can use to add logical extents to a logical volume? A. The lvextend and lvresize commands.

Q. Provide the command to create a volume group called vg20 on /dev/sdd disk with physical extent size 64MB. A. vgcreate -s 64 vg20 /dev/sdd

Q. Thin provisioning technology allows us to create logical volumes of sizes larger than the actual physical storage size. True or False? A. True.

Q. What is the maximum supported number of usable partitions on a GPT disk? A. 128.

Q. Which kernel module is responsible for data block compression in VDO volumes? A. The kvdo module is responsible for compressing data blocks in VDO volumes.

Q. What are the three techniques VDO volumes employ for storage conservation? A. VDO volumes use thin provisioning, de-duplication, and compression techniques for storage conservation.

Q. What would the command parted /dev/sdc mkpart pri 1 200m do? A. The command provided will create a primary partition of size 200MB on the sdc disk starting at the beginning of the disk.

Q. What is the maximum number of usable partitions that can be created on an MBR disk? A. 14.

Q. The gdisk utility can be used to store partition information in MBR format. True or False? A. False. The gdisk tool is only for GPT type tables.

Q. What would the command parted /dev/sdd mklabel msdos do? A. The command provided will apply msdos label to the sdd disk.

Q. Which file in the /proc file system stores the in-memory partitioning information? A. The partitions file.

Q. De-duplication is the process of zero-block elimination. True or False? A. False. De-duplication is the process of removing blocks of identical data.

Q. The parted utility may be used to create LVM logical volumes. True or False? A. False.

Q. What are the two commands that you can use to reduce the number of logical extents from a logical volume? A. The lvreduce and lvresize commands.

Q. A single disk can be used by both parted and LVM solutions at the same time. True or False? A. True. A single disk can be shared between parted-created partitions and LVM.

Q. Provide the command to erase /dev/sdd1 physical volume from vg20 volume group. A. vgreduce vg20 /dev/sdd1

Q. Provide the command to remove vg20 along with logical and physical volumes it contains. A. vgremove -f vg20

Q. What is the default size of a physical extent in LVM? A. The default PE size is 4MB.

Q. What is the default name for the first logical volume in a volume group? A. lvol0 is the default name for the first logical volume created in a volume group.

Q. What is one difference between the pvs and pvdisplay commands? A. The pvs command lists basic information about physical volumes whereas the pvdisplay command shows the details.

Q. When can a disk or partition be referred to as a physical volume? A. After the pvcreate command has been executed on it successfully.

Q. Provide the command to remove webvol logical volume from vg20 volume group. A. lvremove /dev/vg20/webvol

Q. It is necessary to create file system structures in a logical volume before it can be used to store files in it. True or False? A. True.

Q. Physical and logical extents are typically of the same size. True or False? A. True.

Q. What is the purpose of the pvremove command? A. The pvremove command is used to remove LVM information from a physical volume.

Q. What would the command pvcreate /dev/sdd do? A. The command provided will prepare the /dev/sdd disk for use in a volume group.

Q. A disk or partition can be added to a volume group without being initialized. True or False? A. False. A disk or partition must be initialized before it can be added to a volume group.

Q. Provide the command to create a logical volume called webvol of size equal to 100 logical extents in vg20 volume group. A. lvcreate -l 100 -n webvol vg20

Q. A volume group can be created without any physical volume in it. True or False? A. False.

Q. A partition can be used as an LVM object. True or False? A. True.

Q. Which command would you use to view the details of a volume group and its objects? A. The vgdisplay command with the -v option.