Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Manual page 60

Chapter 4. LVM Administration with CLI Commands
You can use the --segments argument of the pvs command to display information about each
physical volume segment. A segment is a group of extents. A segment view can be useful if you want
to see whether your logical volume is fragmented.
The pvs --segments command displays the following fields by default: pv_name, vg_name,
pv_fmt, pv_attr, pv_size, pv_free, pvseg_start, pvseg_size. The display is sorted by
pv_name and pvseg_size within the physical volume.
# pvs --segments
PV VG
/dev/hda2 VolGroup00 lvm2 a-
/dev/hda2 VolGroup00 lvm2 a-
/dev/hda2 VolGroup00 lvm2 a-
/dev/sda1 vg
/dev/sda1 vg
/dev/sda1 vg
/dev/sda1 vg
/dev/sda1 vg
/dev/sda1 vg
/dev/sda1 vg
/dev/sda1 vg
/dev/sdb1 vg
/dev/sdc1 vg
/dev/sdd1 vg
/dev/sde1 vg
/dev/sdf1 vg
/dev/sdg1 vg
You can use the pvs -a command to see devices detected by LVM that have not been initialized as
LVM physical volumes.
# pvs -a
PV
/dev/VolGroup00/LogVol01
/dev/new_vg/lvol0
/dev/ram
/dev/ram0
/dev/ram2
/dev/ram3
/dev/ram4
/dev/ram5
/dev/ram6
/dev/root
/dev/sda
/dev/sdb
/dev/sdb1
/dev/sdc
/dev/sdc1
/dev/sdd
48
Fmt Attr PSize
37.16G 32.00M
37.16G 32.00M
37.16G 32.00M
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 16.75G
lvm2 a- 17.14G 17.14G
lvm2 a- 17.14G 17.14G
lvm2 a- 17.14G 17.14G
lvm2 a- 17.14G 17.14G
lvm2 a- 17.14G 17.14G
lvm2 a- 17.14G 17.14G
VG Fmt
new_vg lvm2 a-
new_vg lvm2 a-
PFree Start SSize
0 1172
1172 16
1188
0 26
26 24
50 26
76 24
100 26
126 24
150 22
172 4217
0 4389
0 4389
0 4389
0 4389
0 4389
0 4389
Attr PSize PFree
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
-- 0
17.14G 17.14G
-- 0
17.14G 17.09G
-- 0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0