Free PE but lvextend fails

[Joachim Weber_1]

Hi,

I tried to extend and lvol and the lvextend comes back and tells me:
# lvextend -L 1500 /dev/vg_158/lvol7
Warning: rounding up logical volume size to extent boundary at size "1504" MB.
lvextend: Not enough free physical extents available.
Logical volume "/dev/vg_158/lvol7" could not be extended.

Although, vgdisplay tells me:
VG Name /dev/vg_158
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 11
Open LV 11
Max PV 16
Cur PV 2
Act PV 2
Max PE per PV 5000
VGDA 4
PE Size (Mbytes) 16
Total PE 8748
Alloc PE 5300
Free PE 3448
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

The config of this lvol might be not entirely correct since it is a leftover from a merge of 2 hard partitions. But I don't know where to look.
Maybe somebody knows.

Thanks,

Joachim

[Joachim Weber_1]

Sorry forgot lvdisplay -v /dev/vg_158/lvol7

LV Name /dev/vg_158/lvol7
VG Name /dev/vg_158
LV Permission read/write
LV Status available/syncd
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 1024
Current LE 64
Allocated PE 128
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation PVG-strict
IO Timeout (Seconds) default

[Jdamian]

Did you realize lvol has a mirror copy with PVG-stric policy ?

You must check the distribution of those all free PEs... a half should reside in one PV (belonging to a PVG) and the other half in other PV (belonging to another PVG).

[Joachim Weber_1]

Would the mirror be a problem when issuing lvextend -L 1500 /dev/vg_158/lvol7. I was under the impression the mirror is als extended by default?

lvdisplay:

--- Distribution of logical volume ---
PV Name LE on PV PE on PV
/dev/dsk/c27t6d0 64 64
/dev/dsk/c31t0d0 64 64

And the VG looks like there would be equally sized space left.


--- Physical volumes ---
PV Name /dev/dsk/c27t6d0
PV Status available
Total PE 4374
Free PE 1724
Autoswitch On

PV Name /dev/dsk/c31t0d0
PV Status available
Total PE 4374
Free PE 1724
Autoswitch On

[Mark Grant]

This logical volume is mirrored and uses 16GB extents. You need 204 extents in the volume roup to satisfy your request.

[Joachim Weber_1]

Mark, you got me. I have to admitt I have no idea where the 204 is coming from. Could you please explain?

[Jdamian]

As test, try to add just ONE physical extent:

lvextend -l 65 /dev/vg_158/lvol7

[Jdamian]

Ooppps !

As test, try to add just ONE logiccal extent (= two physical extents):

lvextend -l 65 /dev/vg_158/lvol7

[Joachim Weber_1]

It would allow me to extend on even 1 extend.

I found in the man pages a hint to /etc/lvmpvg. I added the entries:

VG /dev/vg_158
PVG pv_158
/dev/dsk/c27t6d0
PVG pv_158_m
/dev/dsk/c31t0d0

Now the extension works with another error:
# lvextend -L 1500 /dev/vg_158/lvol7
Warning: rounding up logical volume size to extent boundary at size "1504" MB.
Logical volume "/dev/vg_158/lvol7" has been successfully extended.
Warning: Logical Volume number "1073741828" found on physical volume not found in "/dev/vg_158".
Volume Group configuration for /dev/vg_158 has been saved in /etc/lvmconf/vg_158.conf

What can I do about that?

[Mark Grant]

In that case I hope I was correct!

Oh dear :(

Looks like I was wrong. serves me right. You need 64. However, as mentioned, you have PVG-strict which means the mirror has to be on a different PVG that the primary. You need to make sure your free space is available across your physical volume groups.