topic Re: Considerations when splitting a root mirror in Operating System - HP-UX

Considerations when splitting a root mirror

Rodney Hills — Thu, 09 May 2002 15:15:14 GMT

I have an HPUX 10.20 system with vg00 (root) mirrored . I would like to free up the mirrored disk so I can boot up an 11.11 system on it.

Can I just do lvreduce -m 0?

What about the swap area and other boot info on the disk?

Anyone had any gotcha's I should look out for?

Thanks In Advance

-- Rod Hills

Re: Considerations when splitting a root mirror

John Palmer — Thu, 09 May 2002 15:21:25 GMT

You should be able to lvreduce each volume then vgreduce the disk out of the VG.

Also check that the removed disk isn't in /stand/bootconf.

Regards,
John

Re: Considerations when splitting a root mirror

Helen French — Thu, 09 May 2002 15:24:41 GMT

Hi Rod:

There is no problem doing this. Check one of my old thread and see Clay's suggestion and my Update at the last. I was doing an OS upgrade, but reduced the root mirror before that:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xf1c5a2db8513d6118ff40090279cd0f9,00.html

HTH,
Shiju

Re: Considerations when splitting a root mirror

S.K. Chan — Thu, 09 May 2002 15:25:18 GMT

No problem, a straight forword process..(eg : reducing lvol1->3 on my secondary mirror disk c2t2d0)

# lvreduce -m 0 /dev/vg00/lvol2 /dev/dsk/c2t2d0
==> repeat for the rest
# lvlnboot -v
==> just checking
# vgreduce vg00 /dev/dsk/c2t2d0
# lvlnboot -v
==> check again

Re: Considerations when splitting a root mirror

Patrick Wallek — Thu, 09 May 2002 15:25:45 GMT

Yes, doing the lvreduce on all the logical volumes and then reducing the disk out of VG00 should suffice.

In addition to checking /stand/bootconf you might also want to do a 'lvlnboot -v' to make sure the mirror you just reduced out is not listed.

Re: Considerations when splitting a root mirror

John Palmer — Thu, 09 May 2002 15:26:39 GMT

One other thing, I once got caught by a 10.20 bug where if the primary mirror disk was removed, the boot information was corrupted. Check that all is well with lvlnboot -v before you reboot.

Regards,
John

Re: Considerations when splitting a root mirror

Rodney Hills — Thu, 09 May 2002 15:40:16 GMT

Thanks all for your input.

I'm a little paranoid about disk manipulation and glad to see that I was going in the right direction.

Thanks a mil again...

-- Rod Hills