extending logical volume

[Alexei Chetroi <debian@lexa.uniflux-line.net>]

 Hi,

 I was using LVM for a while, and now trying to extend some volume
without any success. Don't understand why? 
Here is logical volume:

lexa:/home/lex# vgdisplay 
--- Volume group ---
VG Name               system
VG Access             read/write
VG Status             available/resizable
VG #                  0
MAX LV                256
Cur LV                3
Open LV               3
MAX LV Size           255.99 GB
Max PV                256
Cur PV                1
Act PV                1
VG Size               14.99 GB
PE Size               4 MB
Total PE              3838
Alloc PE / Size       3812 / 14.89 GB
Free  PE / Size       26 / 104 MB
VG UUID               H3i4aT-d7cL-iAub-gaWY-7Qbe-N3rF-5QO714

and phisical group
lexa:/home/lex# pvdisplay /dev/ide/host0/bus0/target0/lun0/part5
--- Physical volume ---
PV Name               /dev/ide/host0/bus0/target0/lun0/part5
VG Name               system
PV Size               15 GB [31455207 secs] / NOT usable 4.19 MB [LVM:
142 KB]
PV#                   1
PV Status             available
Allocatable           yes
Cur LV                3
PE Size (KByte)       4096
Total PE              3838
Free PE               26
Allocated PE          3812
PV UUID               xiI1Yj-tc1Y-HPkP-XMvA-izNT-ecOH-8HJ5Lz

Both have 26 free extents, but when trying to extend /dev/system/usr
it complains that not enough free extents are found:
lexa:/home/lex# lvextend -l +1 -v  /dev/system/usr
/dev/ide/host0/bus0/target0/lun0/part5
lvextend -- checking for physical volume paths on command line
lvextend -- checking for valid logical volume path
lvextend -- locking logical volume manager
lvextend -- checking existence of logical volume "/dev/system/usr"
lvextend -- checking for active logical volume "/dev/system/usr"
lvextend -- reading volume group data of volume group "system" from
disk(s)
lvextend -- checking physical volume
"/dev/ide/host0/bus0/target0/lun0/part5" against volume group
lvextend -- getting index of logical volume "/dev/system/usr" in volume
group "system"
lvextend -- getting status of "/dev/system/usr" from VGDA in kernel
lvextend -- extending logical volume "/dev/system/usr" to 1.50 GB
lvextend -- setting up logical volume "/dev/system/usr" for extend
lvextend -- not enough free/allocatable physical extents to extend
logical volume "/dev/system/usr"

Where am I wrong? Could this operation be performed on an active 
logical volume?


 Thanks in advance!

--
Alexei Chetroi