Remove a boot mirror disk on Integrity / Itanium servers

PROBLEM

How to remove a functional mirror disk from the boot / root mirror configuration.

This document provides steps to remove a functional mirror disk from an LVM boot

disk configuration.

These steps apply to Integrity / Itanium based HP-UX systems ONLY.

 

CONFIGURATION

Integrity servers

rx1600 rx1620

rx2600 rx2620

rx4640 bl60p

rx7620 rx7640

rx8620 rx8640

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RESOLUTION

Example disk to be removed from a mirror set:

c2t1d0s2

1. lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/c2t1d0s2

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2. vgreduce /dev/vg00 /dev/dsk/c2t1d0s2 

Safety checks :

# vgdisplay -v /dev/vg00 | grep c2t1d0

Should not return anything

# strings /etc/lvmtab

Ensure that c2t1d0 or s2 device is not listed.

# lvlnboot -v

Ensure no errors and that c2t1d0 is no longer listed.

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3. Steps to remove EFI disk partitions :

# idisk -wR /dev/rdsk/c2t1d0

NOTE: This is destructive, ensure specify correct disk !

Note the use or rdsk device and whole disk device file.

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4. Remove the special device files which are no longer used.

# rmsf /dev/rdsk/c2t1d0s1

# rmsf /dev/rdsk/c2t1d0s2

# rmsf /dev/rdsk/c2t1d0s3

# rmsf /dev/dsk/c2t1d0s1

# rmsf /dev/dsk/c2t1d0s2

# rmsf /dev/dsk/c2t1d0s3

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Use pvcreate or pvcreate -f to format the disk for LVM usage and create or

extend the disk into a volume group.