how to extend pv max size?

[reghpux]

hi:

i have a vg, max pv is 16. but i should add

new pv to this vg to extend diskspace.

what should i do?

[Pete Randall]

Unfortunately, the only way to do this is at vgcreate time. This means that you will have to re-create your vg and then reload your data.


Pete

[Slawomir Gora]

Hi,

in my opinion there is no posibility to change
max pv - you have to backup your data, delete
vg, create new with vgcreate -p max_pv and
restore data.

[Franky_1]

Hi,

1.) backup your data
2.) delete old vg
3.) create new vg with
"vgcreate -p (range from 1 to 255)
4.) restore your data

Regards

Franky

[Geoff Wild]

No way to do this on the existing vg...

Others have shown you a way by backing up....if you have more disks, maybe create a new vg

What you can do is:

create a new vg:

XX - vg number
HH - minor number in HEX

mkdir /dev/vgXX
mknod /dev/vgXX/group c 64 0xHH0000

vgcreate -s 8 -p 128 /dev/vgXX

Add the new disks to this VG

vgextend /dev/vgXX /dev/dsk/cCCtTTdDD /dev/dsk/cCCtTTdDD (etc)

create your lvols...

Temporary mount them, then copy from old to new:

vxdump -0 -f - -s 1000000 -b 16 /oracle | (cd /zmnt/oracle ; vxrestore rf -)

Do for each lvol/file system.

Then unmount all of them, change your fstab to the new vg, mount them, then remove the old vg...

Rgds...Geoff

[Fabio Ettore]

Hi,

it is only possible at the moment of the creation of volume group. Then follow the steps as already suggested by backup, recreate vg and restore.
The good option of vgcreate is -p, see man vgcreate for further details.

Best regards,
Fabio

[reghpux]

Thanks a lot for above!

I want to do follow,but no test:

1.vgexport backup vg.

2.create a new vg (with same vgid)

4.vgimport all old pv to vgnew.

5.and then mount old lv

what about it?

[reghpux]

Thanks a lot for above.

i want to do follow steps,but no test:

1.vgexport old vg (backup)

2.vgexport old vg (delete)

3.vgcreate (same vgid as old vg)

4.vgimport (old vg pv)

what about?Please Reply.I want to know.

[Patrick Wallek]

You can't do that. The vgcreate will wipe out any existing information that you have on those disks.

When working with VG's you can either vgcreate OR vgimport, NOT both.

[Geoff Wild]

Don't think you can set the VGID with vgcreate...

However, you could use the vgcgid command:

vgexport the original volume group

Change the VGID on the original disks.
vgchgid /dev/rdsk/c0t0d0 /dev/rdsk/c0t0d1 /dev/rdsk/c0t0d2

re-create the volum group

Then vgimport those disks...

Then vgextend the new disk...

MAKE SURE YOU HAVE A GOOD BACKUP FIRST!

Rgds...Geoff

[reghpux]

hi,

i create new vg with new pv first.

vgcreate /dev/vgdata /dev/dsk/cxtxdx(new)

vgimport /dev/vgdata /dev/dsk/cxtxdx(old)

how about?

[Pete Randall]

The vgcreate and vgimport commands are mutually exclusive. If you were goint to vimport the steps would be to make the directory (mkdir /dev/vgNN) then create the device file (mknod /dev/vg01/group c64 0xNN0000).


Pete

[Bharat Katkar]

Hi,
I think vgexport/vgimport is not the way for your problem.
You have to recreate the VG with vgcreate and the -p option.

1. Backup all the FileSystems on your VG
2. Note down the LV structure manually ( to ease your LV/Filesystem Creation )
3. vgexport vg (Removes VG)
3. vgcreate -p
4. lvcreate
5. newfs
6. Restore

This way it shoudl work.
Regards,

[reghpux]

it looks that i have to recreate vg.

if i want to bakcup filesystem,

what about user vxdump ?

and who can tell me if it is efficient tool?

[Carlo Corthouts]

How big is your vg that you want to backup?

Might as well use fbackup to backup everything to tape or if you are using dp just make a filesystem backup of the filesystems created under this vg.

Regards,

[Sanjay_6]

Here is a comparison of the backup tools / utilities. The call for any specific backup tool has to be yours, depending on how comfortable you are with that.

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/5187-2216/5187-2216_top.html&con=/hpux/onlinedocs/5187-2216/00/00/56-con.html&toc=/hpux/onlinedocs/5187-2216/00/00/56-toc.html&searchterms=fbackup%7cvxdump&queryid=20040901-094904

Hope this helps.

regds

[reghpux]

my vg has only one lv,and so has

only one filesystem.

Thanks

[Bharat Katkar]

HI,

Since you have to backup a single FileSystem then i think FBACKUP should not be a problem. FBACKUP allows to backup files larger than 2 GB so that is also not a problem.

Other advantages that comes with fbackup are:
..Medium Tape utilisation
..Support on other UNIX platforms
..Multiple backups on single tape
..backup verification
..File Selection from different directories
..Use of extended file attributes

Well assuming your filesystems is mounted on /mnt the command would go in this way:

# fbackup -v -f /dev/rmt/0m -i /mnt

Where /dev/rmt/0m is your backup device also you can exclude any unnecessary files/directories from /mnt using -e option at the end of the command.

Hope that helps.
Regards,