topic Re: How can i see the totall allocatable free space in Operating System - HP-UX

How can i see the totall allocatable free space

Shameem_4 — Fri, 07 Oct 2005 16:50:59 GMT

How can i see the total allocatable free space in a VG on HP-UX LVM ?. Looking for a command(s) that would tell, exactly to what max-size can a volume in that VG be expanded!!.something like vxassist maxgrow in Vxvm!!

Re: How can i see the totall allocatable free space

Torsten. — Fri, 07 Oct 2005 17:05:54 GMT

if you do a "vgdisplay -v "
you will get
...
Max PV x
Max PE per PV y
PE Size (Mbytes) z
...

z*y*z gives you the allocatable/addressable size in the volume.

But if you want to know about the available free space, you have to look for

PE Size (Mbytes) x
Free PE y

and calculate that.

Re: How can i see the totall allocatable free space

Arunvijai_4 — Fri, 07 Oct 2005 23:47:55 GMT

You can use
# vgdisplay /dev/vg00
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 9
Open LV 9
Max PV 16
Cur PV 1
Act PV 1
Max PE per PV 4350
VGDA 2
PE Size (Mbytes) 8
Total PE 4340
Alloc PE 4026
Free PE 314
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

As well,
#vgdisplay -v

-Arun

Re: How can i see the totall allocatable free space

Ranjith_5 — Sat, 08 Oct 2005 01:09:52 GMT

Hi,

Free space available on a vg = Free PE * PE Size (Mbytes). Thease can be obtained from the vgdisplay output.

Take the following example

root@HP in />#vgdisplay vg00
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 9
Open LV 9
Max PV 16
Cur PV 2
Act PV 2
Max PE per PV 4350
VGDA 4
PE Size (Mbytes) 8
Total PE 8680
Alloc PE 6180
Free PE 2500
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

Here Free PE = 2500 and PE Size=8MB

So the Max Size of a volume which can be created on this VG is 2500*8=20,000MB.

Regards,
Syam

Re: How can i see the totall allocatable free space

Orhan Biyiklioglu — Sat, 08 Oct 2005 02:51:43 GMT

Let the awk do the math for you:)

vgdisplay vg00 | awk '/PE Size $Mbytes$/{s=$4}; /Free PE/{f=$3}; END{print s*f" Mbytes free space available on volume group."}'

hth

Re: How can i see the totall allocatable free space

Nguyen Anh Tien — Sun, 09 Oct 2005 21:13:00 GMT

You issue
#vgdisplay -v vg_name|more
You will see
Total PE xxxx
Alloc PE yyyy
Free PE zzzz

Free PE is your free space. Multiply with "PE Size (Mbytes)" you will have values in MB
HTH
tienna

Re: How can i see the totall allocatable free space

Manoj Sivan — Sun, 09 Oct 2005 22:05:00 GMT

Hi Shameem,

Simply verify the output of the vgdisplay for which you have extend the VG. Find out the value of "Free PE" and "PE Size".The following value gives your desired output.

Free PE X PE Size = Extendable free size in MB.

:; vgdisplay vg00
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 3
Open LV 3
Max PV 16
Cur PV 2
Act PV 2
Max PE per PV 4350
VGDA 4
PE Size (Mbytes) 4
Total PE 8680
Alloc PE 8680
Free PE 0
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

Cheers

Manu