How to preserve the root mirror disk before applying patches or upgrading

Document ID: 275374
http://support.veritas.com/docs/275374

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Details:

This procedure is designed to preserve the root mirror disk before applying patches or upgrading. It provides an efficient path for recovery if the upgrade or patch installation is unsuccessful

1. Check that the boot disk has a valid mirror

The volumes associated with the root disk should have a single subdisk for each of the root disk and root mirror plexes.
Note: The root disk-B0 subdisk is a special case, its impact can be investigated via TechNote http://support.veritas.com/docs/231259

Disks:
rootdisk is c1t0d0s2
root mirror disk is c1t1d0s2

# vxprint -htqg rootdg

Disk group: rootdg

dg rootdg default default 29000 1089252062.20.avsmsnss11
dm rootdisk c1t0d0s2 auto 5777 71127179 -
dm rootmirror c1t1d0s2 auto 5777 71121402 -

sd rootdiskPriv - rootdisk 10487070 5777 PRIVATE c1t0d0 ENA

v rootvol - ENABLED ACTIVE 10487070 ROUND - root
pl rootvol-01 rootvol ENABLED ACTIVE 10487070 CONCAT - RW
sd rootdisk-B0 rootvol-01 rootdisk 10487069 1 0 c1t0d0 ENA
sd rootdisk-02 rootvol-01 rootdisk 0 10487069 1 c1t0d0 ENA
pl rootvol-02 rootvol ENABLED ACTIVE 10487070 CONCAT - RW
sd rootmirror-01 rootvol-02 rootmirror 0 10487070 0 c1t1d0 ENA

v swapvol - ENABLED ACTIVE 16773534 ROUND - swap
pl swapvol-01 swapvol ENABLED ACTIVE 16773534 CONCAT - RW
sd rootdisk-01 swapvol-01 rootdisk 10492847 16773534 0 c1t0d0 ENA
pl swapvol-02 swapvol ENABLED ACTIVE 16773534 CONCAT - RW
sd rootmirror-02 swapvol-02 rootmirror 10487070 16773534 0 c1t1d0 ENA

v usr - ENABLED ACTIVE 8389656 ROUND - gen
pl usr-01 usr ENABLED ACTIVE 8389656 CONCAT - RW
sd rootdisk-04 usr-01 rootdisk 27445499 8389656 0 c1t0d0 ENA
pl usr-02 usr ENABLED ACTIVE 8389656 CONCAT - RW
sd rootmirror-03 usr-02 rootmirror 27260604 8389656 0 c1t1d0 ENA

v var - ENABLED ACTIVE 1733400 ROUND - gen
pl var-01 var ENABLED ACTIVE 1733400 CONCAT - RW
sd rootdisk-03 var-01 rootdisk 69390890 1733400 0 c1t0d0 ENA
pl var-02 var ENABLED ACTIVE 1733400 CONCAT - RW
sd rootmirror-04 var-02 rootmirror 35650260 1733400 0 c1t1d0 ENA

2. Install the Solaris boot block on the mirror disk:

# /usr/lib/vxvm/bin/vxbootsetup -g rootdg rootmirror

Note: If you have separate volumes for opt, export, home on the root disk, it is required to define the partitions for those volumes using vxmksdpart:

# /usr/lib/vxvm/bin/vxmksdpart

Usage: vxmksdpart [-f] [-g diskgroup] subdisk sliceno [tag flags]

e.g. In following example, the opt volume subdisk is on rootmirror-05, and slice 7 is free on the mirror disk:

# vxmksdpart -g rootdg rootmirror-05 7 0x00 0x00

3. Disassociate the mirror plex:

# vxplex -g rootdg dis rootvol-02

# vxplex -g rootdg dis swapvol-02

# vxplex -g rootdg dis usr-02

# vxplex -g rootdg dis var-02

# vxplex -g rootdg dis opt-02 -------------------- if any

# vxplex -g rootdg dis home-02 -------------------- if any

4. Edit the following files to make the root mirror disk bootable without VERITAS Volume Manager (tm):

# mount /dev/dsk/c1t1d0s0 /mnt

# cd /mnt/etc

# cp -p system system.orig

# cp -p vfstab vfstab.orig

# cp -p vfstab.prevm vfstab

Change the c#t#d# number in above file to ensure the correct partitions will be referenced in the vfstab file:

# touch /mnt/etc/vx/reconfig.d/state.d/install-db

Edit /mnt/etc/system and comment out following lines using the "*" character:

Before changes:

rootdev ..

set vxio ..

After changes:

* rootdev ..

* set vxio ..

5. Unmount the root mirror's / partition

# umount /mnt

6. Apply patches or upgrade system per Installation Guide

7. Determine if the upgrade was successful

If the upgrade or patching was successful, attach back mirror plex to root disk:

# vxplex -g rootdg att rootvol rootvol-02

# vxplex -g rootdg att swapvol swapvol-02

# vxplex -g rootdg att var var-02

# vxplex -g rootdg att usr usr-02

or

If the upgrade or patching was not successful and want to go back to mirror disk, then follow this procedure:

1. Boot from mirror disk

- Bring down the system to the OK prompt
- Change the defaultboot device to c1t1d0 rootmirror disk
- Boot system

Remove the partition having tag 14 and 15 from mirror disk using format completely. Do not just change tag type, zero out these partitions and labels before exiting fromformat.

2. Determine which version of VERITAS Volume Manager is installed:

The procedure if you are running VERITAS Volume Manager 3.5 and below:

# vxinstall => custom installation => choose to encapsulate current bootdisk (eg. c1t1d0) => leave other disk alone.
It will ask whether you want to preserve Volume Manager information on another disk, answer yes to this question

a. Reboot is required after running vxinstall:

# vxdisk -f init c1t0d0

# vxdg -g rootdg adddisk rootdisk=c1t0d0

b. Mirror root mirror disk with original rootdisk:

# /etc/vx/bin/vxrootmir rootdisk

# /etc/vx/bin/vxmirror rootmirror rootdisk

The procedure if you are running VERITAS Volume Manager 4.0 and above:

a. Manually start up vxconfigd to allow for the encapsulation of the root mirror:

# vxiod set 10

# vxdconfigd -m disable

# vxdctl init

# vxdisk -f init c1t0d0

# vxdctl enable

# rm /etc/vx/reconfig.d/state.d/install-db

# vxdiskadm => option 2 Encapsulate one or more disks => choose c1t1d0 (old rootmirror) => put under rootdg

# shutdown -i6 -g0 -y

b. Mirror root mirror disk with original root disk:

# /etc/vx/bin/vxrootmir -g rootdg rootdisk

# /etc/vx/bin/vxmirror -g rootdg rootmirror rootdisk

Final vxprint will look as follows:

# vxprint -htqg rootdg

Related Documents:

http://support.veritas.com/docs/231259

Products Applied:
Volume Manager for UNIX/Linux 3.5 (Solaris), 3.5 MP1(Solaris), 3.5 MP1+PP3.1 (Solaris), 3.5 MP2 (Solaris), 3.5 MP3 (Solaris), 4.0 (Solaris), 4.0 MP1 (Solaris), 4.1 (Solaris)

Last Updated: March 02 2005 12:40 AM GMT
Expires on: 365 days from publish date

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Subjects:
Solaris
Application: Faq, How To, Installation, Upgrade
Volume Manager for UNIX/Linux
Application: Faq, How To, Installation, Upgrade

Languages:
English (US)

Operating Systems:
Solaris

2.6, 7.0, 7.0 (32-bit), 7.0 (64-bit), 8.0, 8.0 (32-bit), 8.0 (64-bit), 9.0, 9.0 (32-bit), 9.0 (64-bit)

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