How to replace mirrored vg00 on HP-UNIX?

[Sudhaadm]

HI All,
Thanks in advance.
I need the information that to replace the root mirrored disk which is one of the disk has failed.
After replacing the harddisk what steps need to proceed to make bootable and mirroring.
-- Physical volumes ---
PV Name /dev/dsk/c1t6d0
PV Status unavailable
Total PE 4340
Free PE 378
Autoswitch On

PV Name /dev/dsk/c2t6d0
PV Status available
Total PE 4340
Free PE 303
Autoswitch On



root@mslt01:/[8]# setboot
Primary bootpath : 0/0/2/0.6.0
Alternate bootpath : 0/0/2/1.6.0

Autoboot is ON (enabled)
Autosearch is ON (enabled)

root@mslt01:/[9]#

root@mslt01:/[8]# setboot
Primary bootpath : 0/0/2/0.6.0
Alternate bootpath : 0/0/2/1.6.0

Autoboot is ON (enabled)
Autosearch is ON (enabled)
This steps is required on urgency..
Tx

[James R. Ferguson]

Hi:

This guide provides some excellent information:

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

Regards!

...JRF...

[Raj D. · Accepted solution]

Hi Sudhaadm ,

Here is the steps :
1.
# vgcfgrestore -n /dev/vg00 replaced_disk
# vgchange -a y /dev/vg00
# vgsync
# mkboot -a /dev/rdsk/c?t?d?
# mkboot -a "hpux -lq" /dev/rdsk/c?t?d?

Also check setboot , you can set the alternate path as the 2nd disk.
------

Also check both the PV , and make sure they are synced properly and no stale PE.


Hope this will help,

Cheers,
Raj.

[Geoff Wild]

Here's what I do:

After failed disk has been replaced by HP (assuming the disk is c1t5d0):

vgcfgrestore -n /dev/vg00 /dev/rdsk/c1t5d0

mkboot /dev/rdsk/c1t5d0

mkboot -a "hpux -lq (;0) /stand/vmunix" /dev/rdsk/c1t5d0

vgchange -a y /dev/vg00

lvlnboot -Rv /dev/vg00

vgsync /dev/vg00


Now, for a disk that hasn't completely failed:

1) If the disk is completely "dead", such as if you run ioscan and status is "no_hw" then you can hot swap the disk online.

2) However in circumstances where the disk has not fully failed please do one of the following to avoid data corruption :

a) reduce mirror before replacing the disk
b) deactivate VG before replacing the disk
c) shutdown system to replace the disk



And of course:
How to mirror the root disk

Say /dev/dsk/c0t6d0 is the root disk and /dev/dsk/c3t6d0 is the disk you want to make a mirror of.

1. Create a bootable LVM disk to be used for the mirror.
pvcreate -B /dev/rdsk/c3t6d0
2. Add this disk to the current root volume group.
vgextend /dev/vg00 /dev/dsk/c3t6d0
3. Make the new disk a boot disk.
mkboot -l /dev/rdsk/c3t6d0
4. Copy the correct AUTO file into the new LIF area.
mkboot -a "hpux -lq (;0)/vmunix" /dev/rdsk/c3t6d0
5. Mirror the boot, root and primary swap logical volumes to the new
bootable disk. Ensure that all devices in vg00, such as /usr, /swap,
etc., are mirrored.
The following is an example of mirroring the boot logical volume:
lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c3t6d0
The following is an example of mirroring the primary swap logical
volume:
lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c3t6d0
The following is an example of mirroring the root logical volume:
lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/c3t6d0
6. Update the boot information contained in the BDRA for the mirror
copies of boot, primary swap and root.
/usr/sbin/lvlnboot -b /dev/vg00/lvol1
/usr/sbin/lvlnboot -s /dev/vg00/lvol2
/usr/sbin/lvlnboot -r /dev/vg00/lvol3
7. Check if the BDRA is correct.
/usr/sbin/lvlnboot -R /dev/vg00
8. Verify that the mirrors were properly created.
lvlnboot -v /dev/vg00
The output of this command is shown in a display like the following:
Boot Definitions for Volume Group /dev/vg00:
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
/dev/dsk/c0t6d0 (1/0/0/3/0.6.0) -- Boot Disk
/dev/dsk/c3t6d0 (1/0/1/0/0/1/1.6.0) -- Boot Disk
Boot: lvol1 on: /dev/dsk/c0t6d0
/dev/dsk/c3t6d0
Root: lvol3 on: /dev/dsk/c0t6d0
/dev/dsk/c3t6d0
Swap: lvol2 on: /dev/dsk/c0t6d0
/dev/dsk/c3t6d0
Dump: lvol2 on: /dev/dsk/c0t6d0, 0

vgdisplay -v vg00

Then lvextend for all other lvols:

lvextend -m 1 /dev/vg00/lvol4 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol5 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol6 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol7 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol8 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol9 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol10 /dev/dsk/c3t6d0
lvextend -m 1 /dev/vg00/lvol11 /dev/dsk/c3t6d0



Rgds...Geoff

[Raj D.]

Hi Sudhadm ,

Also check this:

Here is a good doc for mirroring root disk.

RootDisk mirror.pdf.


Enjoy ,

hth,
Raj.

[Sudhaadm]

THanks for the help

[Steven E. Protter]

Raj,

Really nice doc.

:-)

SEP