How to Install and configure Logical Volume management in linux

How to Install and configure Logical Volume management in linux

ü  Create a Physical Volume

[root@dlp ~]# pvcreate /dev/sdb1 
Physical volume "/dev/sdb1" successfully created
# input like below if you'd like to specify the amount

[root@dlp ~]# pvcreate --setphysicalvolumesize 50G /dev/sdb1 
Physical volume "/dev/sdb1" successfully created

ü  Display a status of Physical volumes

[root@dlp ~]#pvdisplay /dev/sdb1
  --- NEW Physical volume ---
PV Name                    /dev/sdb1
VG Name
PV Size                       50.00 GiB
Allocatable                  NO
PE Size (KByte)           0
Total PE                     0
Free PE                      0
Allocated PE               0
PV UUID                     hPjJK2-tEgt-RztW-CLLH-NYR3-4t4a-hNt6qT

ü  Change size of a Physical volume

# change size to 100G
[root@dlp ~]#pvresize --setphysicalvolumesize 100G /dev/sdb1
Physical volume "/dev/sdb1" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
[root@dlp ~]#pvdisplay /dev/sdb1
  --- NEW Physical volume ---
PV Name                    /dev/sdb1
VG Name
PV Size                       100.00 GB   # changed
Allocatable                  NO
PE Size (KByte)           0
Total PE                     0
Free PE                      0
Allocated PE               0
PV UUID                     hPjJK2-tEgt-RztW-CLLH-NYR3-4t4a-hNt6qT

Output reports of Physical volumes

[root@dlp ~]#pvs /dev/sdb1 
PV              VG              Fmt            Attr            PSize          PFree
/dev/sdb1                    lvm2           a-               100.00G     100.00G

Scan Physical volumes

[root@dlp ~]#pvscan /dev/sdb1
PV              /dev/sda2                    vg_dlp        lvm2 [29.51 GiB / 0 free]
PV              /dev/sdb1                     lvm2 [100.00 GiB]
Total: 2 [44.51 GiB] / in use: 1 [29.51 GiB] / in no VG: 1 [100.00 GiB]

Remove a Physical volume

[root@dlp ~]#pvremove /dev/sdb1 
Labels on physical volume "/dev/sdb1" successfully wiped
[root@dlp ~]#pvdisplay /dev/sdb1 
No physical volume label read from /dev/sdb1   # none
Failed to read physical volume "/dev/sdb1"

Create a Volume Group

[root@dlp ~]#vgcreate vg_dlp /dev/sdb1   # create a Volume group 'vg_dlp'
Volume group "vg_dlp" successfully created
# insert a space like follows if you specify some devices

[root@dlp ~]#vgcreate vg_dlp /dev/sdb1 /dev/sdd1 
Volume group "vg_dlp" successfully created

Display Volume Groups

[root@dlp ~]#vgdisplay
 --- Volume group ---
VG Name                                       vg_dlp
System ID
Format                                          lvm2
Metadata Areas                              1
Metadata Sequence No                    1
VG Access                                      read/write
VG Status                                      resizable
MAX LV                                          0
Cur LV                                           0
Open LV                                        0
Max PV                                          0
Cur PV                                           1
Act PV                                           1
VG Size                                          100.00 GiB
PE Size                                          4.00 MB
Total PE                                        25599
Alloc PE / Size                                0 / 0
Free PE / Size                                 25599 / 100.00 GiB
VG UUID                                        eoFugC-cEfQ-0qeq-xMuu-yynx-wZA0-qTMt3

Display Volume Groups
[root@dlp ~]# vgdisplay

Rename a Volume Group
[root@dlp ~]#vgrename vg_dlp vg_data # change name from 'vg_dlp' to new name 'vg_data-7'

[root@dlp ~]# vgdisplay

Output reports of Volume Groups

[root@dlp ~]# vgs



Scan Volume Groups

[root@dlp ~]#vgscan

Extend a Volume Group
[root@dlp ~]#vgextend vg_data /dev/sdc1 # add sdc1 in vg_data

[root@dlp ~]#vgdisplay

Reduce a Volume Group

[root@dlp ~]# vgreduce vg_data /dev/sdc1 # remove sdc1 from vg_data

Removed "/dev/sdd1" from volume group "vg_data"
[root@dlp ~]# vgdisplay

Remove a Volume Group

[root@dlp ~]#vgchange -a n vg_data # turn non-active first

0 logical volume(s) in volume group "vg_data" now active
[root@dlp ~]# vgremove vg_data # remove vg_data
Volume group "vg_data" successfully removed

Create a Logical Volume

# create a Logical Volumes 'lv_data' as 50G in volume group 'vg_data'
[root@dlp ~]# lvcreate -L 50G -n lv_data vg_data 
Logical volume "lv_data" created

Display status of Logical Volumes

[root@dlp ~]# lvdisplay 

Rename a Logical Volume

[root@dlp ~]#lvrename vg_data lv_data lv_storage # rename from "lv_data" to "lv_storage"
Renamed "lv_data" to "lv_storage" in volume group "vg_data"
[root@dlp ~]# lvdisplay

Output a report of Logical Volumes

[root@dlp ~]# lvs

Scan Logical Volumes

[root@dlp ~]# lvscan