Red Hat ENTERPRISE LINUX 5 - LOGICAL VOLUME MANAGER ADMINISTRATION Manual page 51

the volume group will not enable you to extend the stripe. Instead, you must add at least two physical
volumes to the volume group.
For example, consider a volume group vg that consists of two underlying physical volumes, as
displayed with the following vgs command.
# vgs
VG #PV #LV #SN Attr
vg 2 0
You can create a stripe using the entire amount of space in the volume group.
# lvcreate -n stripe1 -L 271.31G -i 2 vg
Using default stripesize 64.00 KB
Rounding up size to full physical extent 271.31 GB
Logical volume "stripe1" created
# lvs -a -o +devices
LV VG Attr
stripe1 vg -wi-a- 271.31G
dev/sdb1(0)
Note that the volume group now has no more free space.
# vgs
VG #PV #LV #SN Attr
vg 2 1
The following command adds another physical volume to the volume group, which then has 135G of
additional space.
# vgextend vg /dev/sdc1
Volume group "vg" successfully extended
# vgs
VG #PV #LV #SN Attr
vg 3 1
At this point you cannot extend the striped logical volume to the full size of the volume group, because
two underlying devices are needed in order to stripe the data.
# lvextend vg/stripe1 -L 406G
Using stripesize of last segment 64.00 KB
Extending logical volume stripe1 to 406.00 GB
Insufficient suitable allocatable extents for logical volume stripe1:
34480
more required
VSize
0 wz--n- 271.31G 271.31G
LSize Origin Snap%
VSize
0 wz--n- 271.31G
VSize
0 wz--n- 406.97G 135.66G
VFree
Move Log Copy%
VFree
0
VFree
Extending a Striped Volume
Devices
/dev/sda1(0),/
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