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How to 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

 

 

RESOLUTION

 

Example disk to be removed from a mirror set:

c2t1d0s2

 

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

 

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.

 

 

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.

 

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

 

 

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

extend the disk into a volume group.



Labels: HP-UX

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I'm Madesh, An UNIX System Admin by Profession. I'm having Expertise in HP-UX and Linux Administration. I have done lot of work on the infrastructure Mgmt side in UNIX system administration, Hardware, Storage (EMC/ HP EVA). I'm blogging since 2010.
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