Remove Physical Volume from Volume Group

Snow Crash 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 lv_iscsi_1
  Volume group "lv_iscsi_1" not found
  Cannot process volume group lv_iscsi_1

From the lvremove man page I assumed this command simply requires a LV. E.g.

NAME
       lvremove — remove a logical volume

SYNOPSIS
       lvremove  [-A|--autobackup {y|n}] [--commandprofile ProfileName] [-d|--debug]
       [-h|--help] [-S|--select Selection]  [-t|--test]  [-v|--verbose]  [--version]
       [-f|--force] [--noudevsync] [LogicalVolume{Name|Path}...]

What am I missing?

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 answer on Server Fault.

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