Advanced Storage part

Question 1

list availabe physical volumes

Answer 1

sudo pvs
-v for detailed output

Question 2

list availabel Volume Groups

Answer 2

sudo vgs

Question 3

explaing Physical Extent and how to see its current setting

Answer 3

An exten is the smallest allocatable unit of space in LVM. Default is 4 MB. In a 20GB physical volume, there would be 5,000 PE’s

sudo vgdisplay rhel | grep ‘PE Size’

Question 4

list availabel logical volumes

Answer 4

sudo lvs

Question 5

What is a Logical Extent

Answer 5

a set of physical extents allocated to the logical volume

Question 6

create a physical volume and volume group

Answer 6

1. Make partition - see previous chapter
2. Set the flag on the partition to lvm - not required
   sudo parted /dev/sdd set 1 lvm on
3. verify with print
4. create PV with sdd1 and sde
   sudo pvcreate /dev/sdd1 /dev/sde
5. Create Volume Group (-s = PE size)
   sudo vgcreate -vs 16 vgbook /dev/sdd1 /dev/sde
6. Verify
   sudo vgs vgbook
   sudo vgdisplay -v vgbook
   sudo pvs
   sudo pvdisplay /dev/sdd1
   “ “ /dev/sde

Question 7

create logical volume

Answer 7

1. create LV with default name, -L to specify volume size in MB (can specify GB or TB if needed)
   sudo lvcreate -vL 120 vgbook
   - with a different name and custome logical extent
   sudo lvcreate -l 12 -n lvbook1 vgbook
   2 verify
   sudo lvs
   sudo vgdisplay -v vgbook
   sudo lvdisplay /dev/vgbook/lvol0
   sudo lvdisplay /dev/vgbook/lvbook1

Question 8

extend VG

Answer 8

sudo vgextend vgbook /dev/sdd2
sudo vgs

Question 9

extend LV

Answer 9

sudo lvextend -L +144 /dev/vgbook/lvbook1
sudo vgdislplay -v vgbook

Question 10

rename lvol0 to lvbook2

Answer 10

sudo lvrename vgbook lvol0 lvbook2

Question 11

reduce size of LV lvbook2

Answer 11

sudo lvreduce -L 50 /dev/vgbook/lvbook2

Question 12

add storage to LV

Answer 12

sudo lvresize -L +32 /dev/vgbook/lvbook2
(32MB)

Question 13

remove LV

Answer 13

sudo lvremove /dev/vgbook/lvbook1 -f
***desrtuctive, back up all data!!!

Question 14

reduce size of VG
then remove VG

Answer 14

sudo vgreduce vgbook /dev/sd1 /dev/sde
removes sdd1 and sde

sudo vgremove vgbook

Question 15

uninitialize PV

Answer 15

sudo pvremove /dev/sdd1 /dev/sdd2 /dev/sde

Question 16

create stratis pool

Answer 16

install stratis and enable with systemctl

sudo stratis pool create bookpool /dev/sdg

verify
sudo stratis pool list

Question 17

list the block device that is used to form the stratis pool

Answer 17

sudo stratis bolckdev list bookpool

Question 18

create stratis file system call bookfs in the bookpool

Answer 18

sudo stratis filesystem create bookpool bookfs

verify
sudo stratis filesystem list

Question 19

create directoty call /bookfs1 and mount new file system

Answer 19

sudo mkdir /bookfs1
sudo mount /stratis/bookpool/bookfs /bookfs1

Question 20

check stratis pool usage

Answer 20

sudo stratis pool list

Question 21

expand stratis bookpool

Answer 21

sudo stratis pool add-data bookpool /dev/dsh

Question 22

rename stratis pool

Answer 22

sudo stratis pool rename bookpool rhcsapool

Question 23

destroy stratis file system and pool

Answer 23

sudo umount /bookfs1
sudo stratis filesystem destroy rhcsapoool rhcsafs