lvcreate: Not enough free physical extents available.

[Chas Kalsi]

I am trying to create one volume group with one lvol and stripe it. I have 5 disks which give me 21 gig in total.

Done the following:
pvcreate /dev/rdsk/c2t0d0
pvcreate /dev/rdsk/c2t1d0
pvcreate /dev/rdsk/c2t2d0
pvcreate /dev/rdsk/c2t4d0
pvcreate /dev/rdsk/c2t5d0

vgextend /dev/db /dev/dsk/c2t1d0
.
.
.
.

vgcreate -e 5500 -p 5 -s 4 /dev/db /dev/dsk/c2t0d0

lvcreate -L 10480 -i 5 -I 4096 /dev/db

Logical volume "/dev/db/lvol1" has been successfully created with
character device "/dev/db/rlvol1".
lvcreate: Not enough free physical extents available.
Logical volume "/dev/db/lvol1" could not be extended.
lvcreate: Couldn't retrieve the list of the physical volumes
belonging to volume group "/dev/db".
Run the "lvextend" command to create space on the Logical Volume.

what is going wrong ??


Venus:/> vgdisplay -v db |more
--- Volume groups ---
VG Name /dev/db
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 1
Open LV 1
Max PV 5
Cur PV 5
Act PV 5
Max PE per PV 5500
VGDA 10
PE Size (Mbytes) 4
Total PE 5231
Alloc PE 0
Free PE 5231
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/db/lvol1
LV Status available/syncd
LV Size (Mbytes) 0
Current LE 0
Allocated PE 0
Used PV 0


--- Physical volumes ---
PV Name /dev/dsk/c2t0d0
PV Status available
Total PE 508
Free PE 508
Autoswitch On

PV Name /dev/dsk/c2t1d0
PV Status available
Total PE 2169
Free PE 2169
Autoswitch On

PV Name /dev/dsk/c2t2d0
PV Status available
Total PE 1023
Free PE 1023
Autoswitch On

PV Name /dev/dsk/c2t4d0
PV Status available
Total PE 1023
Free PE 1023
Autoswitch On

PV Name /dev/dsk/c2t5d0
PV Status available
Total PE 508
Free PE 508
Autoswitch On


Venus:/>

[Craig Rants]

Try lvcreate -L 5231 -i 5 -I 4096 /dev/db

the -l option will use pe's

GL,
C

[Sandip Ghosh]

Since your all disks are not of same size it can't stripe like that. It can stripe upto the size of the smaller disk, means it can stripe upto 508 PEs.

Sandip

[Sachin Patel]

Hi Chas,

If you are creating brand new vg on brand new pv you don't need to run vgextend

say you are creating vg02
#pvcreate
#mkdir /dev/vg02
#mknod /dev/vg02/group c 64 0x020000
#vgcreate (put all pv paths)
#lvcreate
#newfs

If you are extending lv/vg then
#pvcreate
#vgextend (give all 5 disk path)
#lvextend
#extendfs

Sachin

[James R. Ferguson]

Hi Chas:

It appears that you created a volume group with only *one* physical disk and then attempted to stripe a logical volume across *five*:

# vgcreate -e 5500 -p 5 -s 4 /dev/db /dev/dsk/c2t0d0

# lvcreate -L 10480 -i 5 -I 4096 /dev/db

You need to 'vgextend' your other four physical disk into /dev/db and then do the 'lvcreate' or start by specifying all five physical disk (pv_path) in the 'vgcreate'.

Regards!

...JRF...

[Victor_5]

See the attached for your reference. Good luck!

[S.K. Chan]

Your problem is the stripe size, set it to a smaller size ..
-I 1024

[Craig Rants]

oops meant to say -l in the lv command...

C

[Sandip Ghosh]

With my earlier explanation the maximum striped lvol you can create is 508(PE Size)*4(LE Size)*5(no. of volume)= 10160 MB.

Sandip

[James R. Ferguson]

Hi (again) Chas:

Upon further reading of your post I (finally) saw the you actually had created the volume group. However, based on you 'vgdisplay' your *smallest* disk only has 508 4MB-extents. This means that striping across your 5-disks ('lvcreate -L 10480 -i 5 -I 4096') will require 10480/5 or 2096MB per disk, *more* space than you have on the smallest disk. Clearly, you need to decrease the size of your logical volume if you are going to utilize this configuration.

Regards!

...JRF...