Mirror disk issue for change HW

[Van christophe]

There is rp4440 with 2 disk array mirrored, thye OS is HP-UX 11i V1. One day I found some reason an altinative disk HW address is changed:
OLD: 0/0/15/1.5.0
NEW: 0/0/15/1.6.0
maybe my co-worker have change some hardware,the VG infomation is changed yet,vgdisplay -v warnning the pv is not found,how can I restore the mirror?

[Geoff Wild]

With vgcfgrestore

vgcfgrestore -R -n /dev/vgXX /dev/rdsk/cXtXdX

where cXtXdX is the "new" device and vgXX is your vg - ie vg01.

Rgds...Geoff

[Luk Vandenbussche]

Try this

vgcfgrestore vg00
vgsync vg00

[Torsten.]

The best thing is to find out why is something changed and change it back when possible.

BTW, where is the disk located?
I don't know about a HW-Path 0/0/15/1.x.0 for a rp4440.

If you sure to go with the "new" disk, split the mirror and set it up with the new device.

[Nguyen Anh Tien]

See my attached doc
Pay your attention on:
Appendix A: Preparing for the Recovery of an LVM System
AND
CHAPTER 4 : Replacing a boot disk WITH mirroring
HTH
tienna

[Thomas J. Harrold]

Post some more information:
1) ioscan -funC disk
2) lvlnboot -v
3) strings /etc/lvmtab

-tjh

[Andrew Fong]

I think you can run:
1. Remove the missing alternate disk
vgreduce -A n /dev/vgXX /dev/dsk/cXtXdX
2. Add the new alternate disk back
vgextend /dev/vgXX /dev/dsk/cYtYdY

Note: In step 1 you need to include -A n option in the command or else it will hang the command.

Hope that help!

[Andrew Fong]

I think you have to remove all the mirrored logical volumes before you can do step 1 and 2.
Example:
lvreduce -A n -m /dev/vgXX/lvol?? /dev/dsk/olddisk