topic Re: How to create boot disk Miroring in Operating System - HP-UX

How to create boot disk Miroring

Andrew Nguyen_1 — Mon, 25 Feb 2008 16:46:52 GMT

Gents,

I have two drives c2t0d0 and c2t1d0 on rp3440 model. C2t0d0 is under VxVm type, but as i try to mirror c2t1d0 using Veritas GUI, it's not allow and within the GUI it has a little (?) mark next to the disk. Perhaps is in LVM control? but as i try pvcreate -B /dev/rdsk/c2t1d0 i got this error:
pvcreate: Could not perform LVM operation on VxVM disk "/dev/rdsk/c2t1d0"

Any assist is greatly appreciated.

Andrew

Re: How to create boot disk Miroring

psreedhar — Mon, 25 Feb 2008 17:19:53 GMT

Hi Andrew,

Run "vxdisk list |grep c2t1d0"
and see what it prints. It might be part of some another DG.

Re: How to create boot disk Miroring

Andrew Nguyen_1 — Mon, 25 Feb 2008 17:56:37 GMT

PSREEDHAR,

Thanks for the reply and below is the result of vxdisk list
# vxdisk list
DEVICE TYPE DISK GROUP STATUS
c2t0d0 simple rootdisk01 rootdg online
c2t1d0 simple - - LVM

Re: How to create boot disk Miroring

Andrew Nguyen_1 — Tue, 26 Feb 2008 14:50:41 GMT

Okay,

Some progression were made up to this.

Remove header with dd command.
#dd if=/dev/zero of=/dev/rdsk/c2t1d0 bs=1024k count=200
#pvcreate -B /dev/rdsk/c2t1d0
#vgextend /dev/vg00 /dev/dsk/c2t1d0

# setboot -v
Primary bootpath : 0/1/1/0.0.0
Alternate bootpath : 0/1/1/0.1.0

Re: How to create boot disk Miroring

Andrew Nguyen_1 — Tue, 26 Feb 2008 14:54:40 GMT

Re: How to create boot disk Miroring

Siju Vadakkan — Tue, 26 Feb 2008 17:34:08 GMT

The follwing loop will mirror all ur LV....

vgdisplay -v vg00 | grep "LV Name" | awk '{print $3}' | while read a

do

lvextend $a /dev/dsk/c2t1d0

done

-------------
if u don't mind can u please provide the following information.

#strings /etc/lvmtab
#vxdisk list

Re: How to create boot disk Miroring

Siju Vadakkan — Tue, 26 Feb 2008 17:37:21 GMT

Ignore the above update becz -m 1 is missing in the lvextend command

The follwing loop will mirror all ur LV....

vgdisplay -v vg00 | grep "LV Name" | awk '{print $3}' | while read a

do

lvextend -m 1 $a /dev/dsk/c2t1d0

done

-------------
if u don't mind can u please provide the following information.

#strings /etc/lvmtab
#vxdisk list

Re: How to create boot disk Miroring

psreedhar — Fri, 29 Feb 2008 15:53:11 GMT

Hi,
I think there some confusion.
You root volume group is under VXVM but not under LVM.

But c2t1d0 has LVM information in that. That's why vxvm is rejecting to add in rootdg.
If you are sure that, you don't have any data in c2t1d0 run the following two commands which will wipe of the LVM information.

dd if=/dev/zero of=/dev/rdsk/c2t1d0 bs=1024 count=1 seek=8
dd if=/dev/zero of=/dev/rdsk/c2t1d0 bs=1024 count=1 seek=72

After running the above two commands perform "vxdisk scandisks" once again.
Then try vxdisk list.
Now the disk shouldn't be shown under vxvm.
Now you use the GUI to mirror the rootDG.

Out of box question?
Why exactly you are using vxvm?

Re: How to create boot disk Miroring

Andrew Nguyen_1 — Mon, 03 Mar 2008 20:58:52 GMT

After removed the header with the dd command and install the MirrorDisk/UX application i was able to create boot disk miroring.

1) # vgreduce /dev/vg00 /dev/dsk/c2t1d0
2) # pvcreate -f -B /dev/rdsk/c2t1d0
3) # vgextend /dev/vg00 /dev/dsk/c2t1d0
# mkboot -l /dev/rdsk/c2t1d0
4) # lvlnboot -v /dev/vg00
5) # for lvol in lvol1 lvol3 ... lvol12
do
lvextend -m 1 /dev/vg00/$lvol /dev/dsk/c2t1d0
done

Thanks everyone,
Andrew