replacing mirror disk hard disk off-line procedure

[KAT_5]

I need to replace the root mirror disk (non hot plugable ) off line. Server has only two disk installed. I am having I/O error but not sure is it primary mirror or sec disk. I am loking for steps to find out the disk and replace it off line.

[Khairy]

can you describe a little bit more about your server. K class? N class? D class? rps?

WOuld also help if you could post :
# ioscan -funC disk
# vgdisplay -v vg00

Rgds

[Patrick Wallek]

What kind of I/O error? If you post the details we may be able to deduce the device that is giving you problems.

[KAT_5]

Its A-class server.

[Torsten.]

Hi,

since the A180 is the only a-class with non hotpluggable disks, you need to do this

- run "ioscan -fnCdisk"
to get your disk device files

- run "dd" against it
(e.g. "dd if=/dev/dsk/c0t5d0 of=/dev/null" - use your device files)

- if you get an IO error, take note of the scsi ID - in the example above it is 5)

- shutdown and open the box, take a look at the jumpers to find the right disk

[KAT_5]

I have pin point the disk. What next steps to configure the mirror

[Patrick Wallek]

This document is a good reference for replacing disks.

When Good Disks Go Bad
http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

[Khairy]

Well to answer your 1st question, which disk your system is booting on, type the following command:

# echo "boot_strings/S" | adb /dev/vmunix /dev/kmem

it will show you something like this..
boot_string:
boot_string: disk(0/0/1/1.15.0.0.0.0;0)/stand/vmunix

run lssf against c1t15d0 or c3t15d0 in your a class to verify which disk in the above said position. Replace it. Make sure your server can boot from alternate path and boot the secondary boot disk.

Once you login to the system, restore the appropriate vg information to the new replace disk.
# vgcfgrestore -n /dev/vg00 /dev/rdsk/c1t15d0

Activate vg00
# vgchange -a y vg00

Reinstate the boot device and LIF data
# mkboot -b /dev/rdsk/c1t15d0

Verify.
# lifls -l /dev/rdsk/c1t15d0
# mkboot -a "hpux -lq" /dev/rdsk/c1t15d0
# lvlnboot -vR /dev/vg00

Synchronized vg00. This make take a while...
# vgsync vg00

Once complete, check status by running lvdisplay to confirm there is no stale extents.

Rgds