How to remove logical and physical volume from Volume Group in Linux

Remove Logical Volume from Volume Group

NOTE: Make sure the logical volume to be removed is unmounted.

Syntax:

# lvremove /path/to/lvm

Once the logical volume is unmounted run the below command from the terminal

# lvremove /dev/NewGroup/office
Do you really want to remove active logical volume office? [y/n]: y
Logical volume "office" successfully removed
Verify the changes (As you see "office" logical volume is successfully deleted)

[root@test2 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/NewGroup/root
LV Name root
VG Name NewGroup
LV UUID 52mm9d-feyC-AWVH-NTMC-VwNa-Ns1p-cJc8vJ
LV Write Access read/write
LV Creation host, time test2.example, 2014-03-14 02:37:58 +0530
LV Status available
# open 1
LV Size 9.92 GiB
Current LE 2539
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Path /dev/NewGroup/swap
LV Name swap
VG Name NewGroup
LV UUID 48hszS-I0uT-Zsxr-jnoY-yEbj-hfBJ-isofU7
LV Write Access read/write
LV Creation host, time test2.example, 2014-03-14 02:38:00 +0530
LV Status available
# open 1
LV Size 1.95 GiB
Current LE 500
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

Remove Physical Volume from Volume Group

Verify the physical volume to be removed

# vgdisplay -v
Finding all volume groups
Finding volume group "VolGroup"
--- Volume group ---
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 25
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 10.81 GiB
PE Size 4.00 MiB
Total PE 2767
Alloc PE / Size 2265 / 8.85 GiB
Free PE / Size 502 / 1.96 GiB
VG UUID uH5AP5-b24E-92h7-nL8b-7Bio-fXe3-pstWIW

--- Logical volume ---
LV Path /dev/VolGroup/root
LV Name root
VG Name VolGroup
LV UUID Qn8TnI-TLNm-rl4Y-ORnd-zU3p-2Kj1-ALSLAg
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 1
LV Size 6.85 GiB
Current LE 1753
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Path /dev/VolGroup/swap
LV Name swap
VG Name VolGroup
LV UUID M1ucwx-2sjb-o9Q4-a2td-aPvi-FO1C-ggHuPn
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 1
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

--- Physical volumes ---
PV Name /dev/sda2
PV UUID uYfzd6-4jh1-YTP7-I3hx-WdSJ-4mTR-HZcdtq
PV Status allocatable
Total PE / Free PE 2509 / 244

PV Name /dev/sdb1
PV UUID Am341r-9WLV-NgWo-Un0Y-sVLQ-fyXM-0zyDix
PV Status allocatable
Total PE / Free PE 258 / 258

As you can see my VolGroup contains /dev/sda2 and /dev/sdb1 partition. Let us try to remove /dev/sdb1

To remove a Physical Volume first we need to remove it from the Volume group using below syntax

Syntax:

# vgreduce name_of_vol_grp path/of/pv
# vgreduce VolGroup /dev/sdb1
Removed "/dev/sdb1" from volume group "VolGroup"

Once reduce from volgroup we can easily remove the PV using below command

# pvremove /dev/sdb1
Labels on physical volume "/dev/sdb1" successfully wiped

I hope I made my self clear. Please let me know your success and failures.