Remove Physical Volume from Volume Group

Snowcrash asked:

How do you remove a PV from a VG?

Here’s what I’ve tried:

# vgreduce vg_iscsi /dev/sdb1
Physical volume "/dev/sdb1" still in use

# lvs
LV         VG       Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root       centos   -wi-ao----   6.67g                                                    
  swap       centos   -wi-ao---- 820.00m                                                    
  lvm02      vg2      -wi-a----- 800.00m                                                    
  lv_iscsi_1 vg_iscsi -wi-ao----  52.00m  

Then

# lvremove -f vg_iscsi/lv_iscsi_1
Logical volume vg_iscsi/lv_iscsi_1 in use.

Using fuser

# fuser -kuc /dev/vg_iscsi/lv_iscsi_1
/dev/dm-3:            1558(root)

I tried to kill -9 this but the process seemed to have disappeared by the time I issued the kill signal.

However, now I get this:

# vgreduce vg_iscsi /dev/sdb1
Can't remove final physical volume "/dev/sdb1" from volume group "vg_iscsi"

Any ideas?

My answer:


The vgreduce command is correct, but you can’t remove a physical volume from the volume group until it’s empty. That is what the error message that you received means.

As the man page states:

       To move all Physical Extents that are used by simple Logical Volumes on
       /dev/sdb1 to free Physical Extents elsewhere in the Volume Group use:

       pvmove /dev/sdb1

Once the PV is empty, you can then repeat the vgreduce command to remove it.


View the full question and any other answers on Server Fault.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.