topic Re: Remove unwanted boot disk in Operating System - HP-UX

Remove unwanted boot disk

Andrew_80 — Thu, 27 Mar 2003 23:23:32 GMT

Hello all..

My issue is I have an extra disk marked as a Boot Disk when I do lvlnboot -v and this disk c0t5d0 should not be a boot disk. I tested my Primary and Alternate and they work fine. How can I remove the mark "Boot Disk" from this disk
lvlnboot -v
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c4t6d0 (1/0/0/3/0.6.0) -- Boot Disk
/dev/dsk/c7t6d0 (1/0/1/0/0/1/1.6.0)
/dev/dsk/c0t6d0 (0/0/0/3/0.6.0) -- Boot Disk
/dev/dsk/c0t5d0 (0/0/0/3/0.5.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c4t6d0
/dev/dsk/c0t6d0
Root: lvol3 on: /dev/dsk/c4t6d0
/dev/dsk/c0t6d0
Swap: lvol2 on: /dev/dsk/c4t6d0
/dev/dsk/c0t6d0
Dump: lvol2 on: /dev/dsk/c4t6d0, 0
Dump: lvol9 on: /dev/dsk/c7t6d0, 1

Re: Remove unwanted boot disk

S.K. Chan — Thu, 27 Mar 2003 23:44:13 GMT

I think all you have to do is run pvcreate on that disk to destroy its reserved boot area.
# pvcreate -f /dev/rdsk/c0t5d0
Be VERY sure that c0t5d0 is not used before you run pvcreate on it.

Re: Remove unwanted boot disk

Michael Tully — Thu, 27 Mar 2003 23:48:20 GMT

Try using :

# pvdisplay -v /dev/dsk/c0t5d0

This will display any logical volume information if there is any. As long as there is none, then the disk can have be blurbed and re-used. If there is these logical volumes should be removed nicely, otherwise, your LVM will not not like it.

# pvcreate -f /dev/dsk/c0t5d0
will flatten the disk

Re: Remove unwanted boot disk

Andrew_80 — Thu, 27 Mar 2003 23:53:04 GMT

Sorry I forgot to mention, the disk is mirror of c7t6d0 which has swap. is there a way to do it without pvcreate ?

Is there a reverse command for mkboot ?

Re: Remove unwanted boot disk

Sridhar Bhaskarla — Thu, 27 Mar 2003 23:55:01 GMT

I am not sure if you want to do a pvcreate on the disk while it is in the volume group. Doing a pvcreate is going to destroy the LVM structures including VGID and will create problems. (You can use vgcfgrestore to fix the problem through).

In your case, when you did a 'pvcreate -B' on the disk initially while adding the disk into the volume group, it got recognized as the boot disk.

You can probably do a selective dd and erase the boot area but I would not suggest it.

I would say to move the logical volumes out of it to other disks in the same VG, take it out of vg00, do a "pvcreate -f" and then vgextend it back to vg00. This is a safe procedure.

-Sri

Re: Remove unwanted boot disk

Frank Slootweg — Fri, 28 Mar 2003 10:57:33 GMT

> Is there a reverse command for mkboot ?

Yes, rmboot(1M), see the mkboot(1M) manual page "man mkboot" or "man rmboot"):

> NAME
> mkboot, rmboot - install, update or remove boot programs from disk

Re: Remove unwanted boot disk

Steven E. Protter — Fri, 28 Mar 2003 15:37:45 GMT

split the mirrors on swap first and anything else mirrored to the disk. I do that once a decade so I cheated and used sam

Then lvremove the mirror copy thats on that disk.

Then pvceate -f

Then lvextend -m 1 /vg00/lvol2 /dev/dsk/c0t5d0

Repeat for anyting else mirrored.

Then you're done.

It can all be done by day, no system down time required at all.

SEP