5.4.2. Moving Extents to a New Disk

In this example, the logical volume is distributed across three physical volumes in the volume group myvg as follows:

[root@tng3-1]# pvs -o+pv_used
  PV         VG   Fmt  Attr PSize  PFree  Used
  /dev/sda1  myvg lvm2 a-   17.15G  7.15G 10.00G
  /dev/sdb1  myvg lvm2 a-   17.15G 15.15G  2.00G
  /dev/sdc1  myvg lvm2 a-   17.15G 15.15G  2.00G

We want to move the extents of /dev/sdb1 to a new device, /dev/sdd1.

5.4.2.1. Creating the New Physical Volume

Create a new physical volume from /dev/sdd1.

[root@tng3-1 ~]# pvcreate /dev/sdd1
  Physical volume "/dev/sdd1" successfully created

5.4.2.2. Adding the New Physical Volume to the Volume Group

Add /dev/sdd1 to the existing volume group myvg.

[root@tng3-1 ~]# vgextend myvg /dev/sdd1
  Volume group "myvg" successfully extended
[root@tng3-1]# pvs -o+pv_used
  PV         VG   Fmt  Attr PSize  PFree  Used
  /dev/sda1   myvg lvm2 a-   17.15G  7.15G 10.00G
  /dev/sdb1   myvg lvm2 a-   17.15G 15.15G  2.00G
  /dev/sdc1   myvg lvm2 a-   17.15G 15.15G  2.00G
  /dev/sdd1   myvg lvm2 a-   17.15G 17.15G     0

5.4.2.3. Moving the Data

Use the pvmove command to move the data from /dev/sdb1 to /dev/sdd1.

[root@tng3-1 ~]# pvmove /dev/sdb1 /dev/sdd1
  /dev/sdb1: Moved: 10.0%
...
  /dev/sdb1: Moved: 79.7%
...
  /dev/sdb1: Moved: 100.0%

[root@tng3-1]# pvs -o+pv_used
  PV          VG   Fmt  Attr PSize  PFree  Used
  /dev/sda1   myvg lvm2 a-   17.15G  7.15G 10.00G
  /dev/sdb1   myvg lvm2 a-   17.15G 17.15G     0
  /dev/sdc1   myvg lvm2 a-   17.15G 15.15G  2.00G
  /dev/sdd1   myvg lvm2 a-   17.15G 15.15G  2.00G

5.4.2.4. Removing the Old Physical Volume from the Volume Group

After you have moved the data off /dev/sdb1, you can remove it from the volume group.

[root@tng3-1 ~]# vgreduce myvg /dev/sdb1
  Removed "/dev/sdb1" from volume group "myvg"

You can now reallocate the disk to another volume group or remove the disk from the system.