Usages of Physical Extend

[karfai]

HI

Any way to see how many physical extend are in use with a LV ?

kar fai

[Joseph Loo]

hi,

use lvdisplay command:

# lvdisplay -v /dev/vg##/lvol#
look at the "Allocated PE" and that is the physical extents for that logical volume.


regards

[karfai]

Thanks for the prompt reply.
I should re-phrase my question.

if I have 1000 pe in a lvol, any way to see which pe are in use ?

[Joseph Loo]

hi,

use "lvdisplay -v" and scroll to the logical extents, it will tell u which PE is use.

hope it helps.

regards.

[Nguyen Anh Tien]

#vgdisplay -v vgname
--- Volume groups ---
VG Name /dev/vgname
VG Write Access read/write
VG Status available
Max LV 255
Current LE 250
Allocated PE 250
Used PV 1
.........
..........
LV Name /dev/vg01/lvbkp
LV Status available/syncd
LV Size (Mbytes) 2000
Current LE 500
Allocated PE 500
Used PV 1


--- Physical volumes ---
PV Name /dev/dsk/c5t0d0
PV Name /dev/dsk/c4t0d0 Alternate Link
PV Status available
Total PE 20476
Free PE 0
Autoswitch On

PV Name /dev/dsk/c5t0d1
PV Name /dev/dsk/c4t0d1 Alternate Link
PV Status available
Total PE 17917
Free PE 0
Autoswitch On

PV Name /dev/dsk/c4t0d4
PV Name /dev/dsk/c5t0d4 Alternate Link
PV Status available

[Abhijit P.]

hi karfai,

You need to first find out the disk of which you need free PEs

# vgdisplay -v vgname

in the last outputs it will show you the disks for that VG

then just give

# pvdisplay -v /dev/dsk/cntndn

it shows you all the PEs associated with the disk.

Current PEs are used ones and Free PEs free
ones

Thanks and Regards,
Abhijit

[Thayanidhi]

Hi,
I think your question is the free PE of a LV.
Not free PE of a PV.

There is no way find out free PE in a LV.
If LV size is 1000 and if the file system on it may me very less. From LVM commands you cannot determine which is free/used.

If you have online-jfs installed and if your file system vxfs then you can use fsadm to organise the used data blocks and do a lvreduce!!

May be I am wrong,

Regds
TT

[Sunil Sharma_1]

Hi,

there isno way to find out which PE in a LV is used fro data and which is free. Data managment is done by file system layer so no LVM command can give you this information.



Sunil

[karfai]

Thanks All

[karfai]

answer found