topic Space Reallocation Issue in Operating System - HP-UX

Space Reallocation Issue

Adrian Sobers2 — Wed, 25 Jan 2006 08:12:11 GMT

Here is the situation:

VG00 LVM 10696 of 34720 MB available 1 Physical volume 10 Logical Volumes

VG01 LVM 12 of 104172 MB available 3 Physical volumes 2 Logical volumes

Is it possible to re-allocate some of the space from VG00 to one of the logical volumes on VG01?

We do not have Online JFS, so if it can be done it will have to be after-hours since it's a production database server.

Any help would be greatly appreciated, thanks.

Re: Space Reallocation Issue

Pete Randall — Wed, 25 Jan 2006 08:17:21 GMT

Adrian,

Since you only have one physical volume in VG00, you won't be able to re-allocate any space to VG01 - it would have to be done at the PV level.

Pete

Re: Space Reallocation Issue

James R. Ferguson — Wed, 25 Jan 2006 08:20:58 GMT

Hi Adrian:

That depends on how you mean the question.

vg00 has only one physical volume. You can create new logical volumes on vg01 and copy(with 'fbackup', 'cpio', 'tar' or 'cp') files from vg00 to vg01. Then, when done, you could 'lvremove' the copied logical volumes from vg00. To do this, you will need to quiesce all access to the filesystems that you want to copy.

Regards!

...JRF...

Re: Space Reallocation Issue

Chan 007 — Wed, 25 Jan 2006 08:22:08 GMT

It is not possible even you have online JFS mate. You have only one PV.

Better upgrate your VG03 - PVs or add one more disk to it.

Chan

Re: Space Reallocation Issue

MarkSyder — Wed, 25 Jan 2006 08:28:00 GMT

If you're talking about allocating space to one of the two existing lvols, no. If you're talking about setting up a new lvol on vg00 for application use, yes, but I'd be surprised if there's a single person on this forum who would recommend it.

You should keep vg00 for operating system. If vg01 is short of space speak to the man with the cheque book.

Mark Syder (like the drink but spelt different)

Re: Space Reallocation Issue

Adrian Sobers2 — Wed, 25 Jan 2006 08:30:07 GMT

Thanks all, I found the "culprit".

Before the Oracle install, we had copied all the source oracle install CDs to disk as that made installing easier than from the actual media.

I just removed all the oracle install source directories and have reclaimed a huge chunk of space.

We went from 97% used to 88% with that removal.

Plus once we factor in compressing the Oracle backups, we will be fine.

Thanks for all the help.

Re: Space Reallocation Issue

Bill Hassell — Wed, 25 Jan 2006 08:38:39 GMT

In LVM, a volume is composed of one or more disks and that is the smallest unit within the volume. So you could remove (reduce) a disk from one volume and add that disk to another volume. However, in your example, VG00 is just one disk so you cannot remove a disk from VG00.

Note that VG00 has only one disk so it is not mirrored. This puts your system at risk if there is a disk failure. Recommendation is to purchase an extra disk and the Mirror/UX software.

Re: Space Reallocation Issue

Victor BERRIDGE — Wed, 25 Jan 2006 08:46:29 GMT

Hi Adrian!

So hpux guru now then?

There is not other solution but to add a new disk to VG01...
But perhaps to solve your issue temporarily, you could try to move some data from vg01 to a new file system on vg00 and link, for this look if you could find a candidate directory in vg01 (do a du -sk . to see the size(in KB)) try to find something like 1-2 GB, create a lvol on vg00 and a filesystem, mount it somewhere on vg00 then go to your directory in vg01, be sure no one is changing the data (if oracle close the instances) then, once in the source directory do a find . -print| cpio -pduml /
then you can remove the source directory and link (ln -s) source-directory-name
Since you are going to erase, play safe and backup before...
As I said this is - if possible a temporary work around, I will have to get that extra disk one day...

All the best
Victor