Replacing Primary Boot Disk on RX4640

[Montu_1]

Hi All,

Primary boot disk on RX4640 is giving frequent error "Disk at hardwarepath path 0/1/1/0.0.0 : Media failure disk_em CRITICAL 100337" so i need to replace disk.

================
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 73.4GMAU3073NC
/dev/dsk/c2t0d0 /dev/rdsk/c2t0d0
/dev/dsk/c2t0d0s1 /dev/rdsk/c2t0d0s1
/dev/dsk/c2t0d0s2 /dev/rdsk/c2t0d0s2
/dev/dsk/c2t0d0s3 /dev/rdsk/c2t0d0s3
===============
strings /etc/lvmtab
/dev/vg00
/dev/dsk/c2t0d0s2 >>
/dev/dsk/c2t1d0s2

All the Lvs are sync and all pvs are available for VG00,

It is a production environment and i am going to perform this first time so i need step by step instruction for this.

Thanking you in advance,

[Mridul Shrivastava · Accepted solution]

Mirror vg00 on Itanium systems that are running B.11.23:

1. From HPUX, use vgdisplay to identify the disk that is in vg00. Use
ioscan to find the spare disk.

# vgdisplay -v --> vg00 is on /dev/dsk/c2t1d0s2 in this example
# ioscan -efunC disk --> Let's assume c3t2d0 for this example

2. Create the system, OS, and service partitions.

# cat </tmp/partitionfile
> 3
> EFI 500MB
> HPUX 100%
> HPSP 400MB
> EOF
# idisk -wf /tmp/partitionfile /dev/rdsk/c3t2d0
idisk version: 1.31
********************** WARNING ***********************
If you continue you may destroy all data on this disk.
Do you wish to continue(yes/no)? yes <-- Answer "yes" and not "y"

3. Create device files needed for the new partitions.

# insf -eC disk

4. Verify the partition table.

# idisk /dev/rdsk/c3t2d0

5. Verify that the device files were created properly.

# ioscan -efnC disk --> c3t2d0 is 0/1/1/1.2.0

6. Initialize the efi partition for use.

# efi_fsinit -d /dev/rdsk/c3t2d0s1

7. Populate the /efi/hpux/ directory in the new EFI system partition.

# mkboot -e -l /dev/rdsk/c3t2d0

8. Change the auto file for the mirror to boot without quorum.
NOTE: Using "s1"

# echo "boot vmunix -lq" > /tmp/AUTO.lq
# efi_cp -d /dev/rdsk/c3t2d0s1 /tmp/AUTO.lq /EFI/HPUX/AUTO

NOTE: We assume that if we boot from the primary, the mirror is fully
functional and therefore we don't need to override quorum. Your site
might require that both disks override quorum.

9. Verify the contents of the auto file on the primary and the mirror.
NOTE: Using "s1"

# efi_cp -d /dev/rdsk/c2t1d0s1 -u /EFI/HPUX/AUTO /tmp/AUTO.pri
# efi_cp -d /dev/rdsk/c3t2d0s1 -u /EFI/HPUX/AUTO /tmp/AUTO.alt
# cat /tmp/AUTO.pri
# cat /tmp/AUTO.alt

10. Add the new partition to vg00.
NOTE: Using "s2"

# pvcreate -fB /dev/rdsk/c3t2d0s2
# vgextend vg00 /dev/dsk/c3t2d0s2

11. Mirror all logical volumes in vg00.
NOTE: Using "s2"

# lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c3t2d0s2
# lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/c3t2d0s2
# lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/c3t2d0s2
.
.
.
# lvextend -m 1 /dev/vg00/lvol8 /dev/dsk/c3t2d0s2

12. Add the new disk to /stand/bootconf.
NOTE: Using "s2"

# echo "l /dev/dsk/c3t2d0s2" >> /stand/bootconf

13. Verify that the new disk was added to vg00, and the lv's are in sync.

# vgdisplay -v vg00

14. Verify that the BDRA was updated properly. Take note of the HW paths for
step 15.

# lvlnboot -v

15. Add EFI primary and high availability boot path menu entries.

# setboot -p 0/1/1/0.1.0 <-- Set primary disk
# setboot -h 0/1/1/1.2.0 <-- Set mirror disk
# setboot -b on <-- Set autoboot on

16. Verify that the primary and mirror boot paths are configured properly.

# setboot

17. Test the new mirror by booting off of it.

# shutdown -r -y 0

18. Select "HP-UX HA Alternate Boot" to test the mirror.

EFI Boot Manager ver 1.10 [14.61] Firmware ver 2.21 [4334]
Please select a boot option
HP-UX Primary Boot: 0/1/1/0.1.0
HP-UX HA Alternate Boot: 0/1/1/1.2.0
EFI Shell [Built-in]

20. Verify which disk/kernel you booted from.

# grep "Boot device" /var/adm/syslog/syslog.log
vmunix: Boot device's HP-UX HW path is: 0.1.1.1.2.0

21. Remove temporary files.

# rm /tmp/partitionfile /tmp/AUTO*

[Montu_1]

Hi Mridul,

Thanks for your detail answer.

I am going to replace primary disk and at present system is booted from primary disk.

I have 2 more doughts

1) do i need to reboot the system from alternate disk ?

2) do i need to remove the primary disk from vg00 ?

[Mridul Shrivastava]

There is no need to reboot the system from alternate disk, primary disk can be replaced online.

You don't have to remove the disk from vg00 if there are LVM OLAR patches, same can be find using "swlist -l patch | grep -i OLR"

If it doesn't show LVM OLR patch then you have to remove the primary disk and extend the vg00 again. Make sure that u do lvreduce for all LVs before proceeding for vgreduce on the same.

[YAQUB_1]

Hi Montu,

Please assign points, when some one reply Ur question. I think so â Mr. Mridul Shrivastavaâ deserve at let 10 points.

If you interest, then U also see the below URL site, hope it will also help for U in future.

http://docs.hp.com/en/5992-3385/ch04s08.html
http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

Thanks--Yaqub
I am a Customer Advocate!!!

[Montu_1]

Thanks again Mrudul!
I have assigined the points!