topic Re: unallocated disk space in Operating System - HP-UX

unallocated disk space

Grant Wenstrand_1 — Mon, 22 Oct 2001 17:14:28 GMT

Not sure if this is the right forum or not, but it looks like the closest fit.

Would someone be so kind as to share with me a command to return unallocated disk space? I can get it using SAM, but I can't seem to find the right command to return this vaule. Any thoughts?

I am running 10.20.

Thank you.

Grant

Re: unallocated disk space

harry d brown jr — Mon, 22 Oct 2001 17:16:58 GMT

vgdisplay -v vgnamehere

Then look for Free PE, where a PE is usually 4MB.

Re: unallocated disk space

Santosh Nair_1 — Mon, 22 Oct 2001 17:20:28 GMT

you can use the vgdisplay -v command to see the free extents on each VG. Typically an extent is 4MB, so take the free extents and multiply by the PE size, i.e. 4MB to determine in MB the amount of free space on each VG.

-Santosh

Re: unallocated disk space

G. Vrijhoeven — Mon, 22 Oct 2001 17:22:23 GMT

Hi,

if you want unused disk space on a volume group that you should go with the command Harry gave you. If you want free space in a file system you can use the bdf command.
if you want free space of unused disks you can try finding it with sam.

Re: unallocated disk space

James R. Ferguson — Mon, 22 Oct 2001 17:24:08 GMT

Hi:

# vgdisplay /dev/vgXX

...will return the PE size in MB along with the amount allocated and unallocated. Remember, 1MB=1024 KB.

...JRF...

Re: unallocated disk space

Rita C Workman — Mon, 22 Oct 2001 17:26:34 GMT

You state 'unallocated' disks. Now if these disks are attached to a vg than the vgdisplay will tell you what has not been extended out....BUT....
Since I'm not sure what kind of disk array you have...I'm not 100% sure what command to state.
If you have an EMC disk array you might want to use the 'inq' utility. But bear in mind that will not report any disks that are being used as raw devices.
Or you may want to use the 'arraydsp' command.
If you have some different kind of disk array you may want to check to see what utilities they offer....

Well, hope this helps get you started at least,

Rit

Re: unallocated disk space

Sridhar Bhaskarla — Mon, 22 Oct 2001 17:35:22 GMT

To get the unallocated disk space, you can do the following.

1. Get the volume groups

$/usr/sbin/vgdisplay -v |grep "VG Name" |awk '{print $3}'
(You will get a list here say vg00,vg01,vg02 etc.,)
$/usr/sbin/vgdisplay vgxx |grep "Free PE" |awk '{print $3}' ---> A
(You will get the number of PEs free on this volume group.)
$/usr/sbin/vgdisplay vgxx |grep "PE Size" |awk {print $4}' -----> B
(You will get the PE size here)
The total space available in this volume group is "Number of Free PE x PE Size" = AxB

Repeat the above for all the volume groups listed in step 1.

You will get free space in each volume group.

-Sri

Re: unallocated disk space

A. Clay Stephenson — Mon, 22 Oct 2001 17:36:26 GMT

Hi:

Vgdisplay -v can certainly be used to indicate unused LVM space; however, if you want to know much more about disk space and possibly unused physical volumes then the best is an old standby written by Peter Van Giel - lvmcollect.

You can use it as is or modify it to your heart's content.

Clay

Re: unallocated disk space

James R. Ferguson — Mon, 22 Oct 2001 17:37:42 GMT

Hi (again) Grant:

Rita's point is well taken. I presume(d) that you are looking at a volume group. To look at a physical disk (maybe just one of several in a vg), do:

# pvdisplay /dev/dsk/cXtYdZ

...or to look merely at the capacity, regardless of whether the physical disk is configured with LVM or not, do:

# diskinfo /dev/rdsk/cXtYdZ

...and note the use of the (r)aw device file in the 'diskinfo' syntax.

Regards!

...JRF...

Re: unallocated disk space

Grant Wenstrand_1 — Mon, 22 Oct 2001 19:11:07 GMT

Thank you everyone for your replies. Everyone was so generous with their answers.

Sridhar Bhaskarla, your answer was right on for what I was attempting to accomplish.

Sorry for making all you guys DIG to figure out what I meant.

Cheers,

Grant