VxVM Unencapsulating a root disk

Unencapsulating a root disk
If your system partitions (/, swap, /usr, /var) are located on more than one physical disk, you will have to manually "unencapsulate" your root disk instead of using Veritas' vxunroot command below.

1. Modify /etc/vfstab to reference the cxtxdxsx devices instead of the VxVM devices.

2. Comment out the lines in /etc/system between:

* vxvm_START (do not remove)
* vxvm_END (do not remove)

3. Run the following command to prevent VxVM from starting up after reboot:

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

4. Reboot the system. After the reboot, you may uninstall VxVM if needed.

System partitions on boot disk
The Veritas vxunroot command is used to unencapsulate a root disk that contains all your system partitions. However, if the root disk is mirrored, you have to remove the mirror plexes.

Example:

# /etc/vx/bin/vxunroot

This operation will convert the following file systems from
volumes to regular partitions: root swap usr var opt home

ERROR: There are 2 plexes associated with volume rootvol
The vxunroot operation cannot proceed.

Listing of all volumes in rootdg:

# vxprint -v -g rootdg
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
v opt gen ENABLED 4198392 - ACTIVE - -
v rootvol root ENABLED 1050776 - ACTIVE - -
v swapvol swap ENABLED 4198392 - ACTIVE - -
v usr gen ENABLED 4198392 - ACTIVE - -
v var gen ENABLED 4198392 - ACTIVE - -

Here we see that rootdg contains volumes opt, rootvol, swapvol, usr, and var. Let's see if the volumes consist of more than one plex.

# vxprint opt rootvol swapvol usr var
Disk group: rootdg

TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
v opt gen ENABLED 4198392 - ACTIVE - -
pl opt-01 opt ENABLED 4198392 - ACTIVE - -
sd rootdisk-04 opt-01 ENABLED 4198392 0 - - -
pl opt-02 opt ENABLED 4198392 - ACTIVE - -
sd rootdisk-mirror-01 opt-02 ENABLED 4198392 0 - - -

v rootvol root ENABLED 1050776 - ACTIVE - -
pl rootvol-01 rootvol ENABLED 1050776 - ACTIVE - -
sd rootdisk-B0 rootvol-01 ENABLED 1 0 - - Block0
pl rootvol-02 rootvol ENABLED 1050776 - ACTIVE - -
sd rootdisk-02 rootvol-01 ENABLED 1050775 1 - - -

v swapvol swap ENABLED 4198392 - ACTIVE - -
pl swapvol-01 swapvol ENABLED 4198392 - ACTIVE - -
sd rootdisk-01 swapvol-01 ENABLED 4198392 0 - - -
pl swapvol-02 swapvol ENABLED 4198392 - ACTIVE - -
sd rootdisk-mirror-03 swapvol-02 ENABLED 4198392 0 - - -

v usr gen ENABLED 4198392 - ACTIVE - -
pl usr-01 usr ENABLED 4198392 - ACTIVE - -
sd rootdisk-03 usr-01 ENABLED 4198392 0 - - -
pl usr-02 usr ENABLED 4198392 - ACTIVE - -
sd rootdisk-mirror-04 usr-02 ENABLED 4198392 0 - - -

v var gen ENABLED 4198392 - ACTIVE - -
pl var-01 var ENABLED 4198392 - ACTIVE - -
sd rootdisk-05 var-01 ENABLED 4198392 0 - - -
pl var-02 var ENABLED 4198392 - ACTIVE - -
sd rootdisk-mirror-05 var-02 ENABLED 4198392 0 - - -

VM disk rootdisk-mirror contains mirror plexes for volumes opt,rootvol, swapvol, usr, and var. We have to remove the plexes before proceeding with vxunroot.

# vxplex -o rm dis opt-02 rootvol-02 swapvol-02 usr-02 var-02

# vxprint opt rootvol swapvol usr var
Disk group: rootdg

TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
v opt gen ENABLED 4198392 - ACTIVE - -
pl opt-01 opt ENABLED 4198392 - ACTIVE - -
sd rootdisk-04 opt-01 ENABLED 4198392 0 - - -

v rootvol root ENABLED 1050776 - ACTIVE - -
pl rootvol-01 rootvol ENABLED 1050776 - ACTIVE - -
sd rootdisk-B0 rootvol-01 ENABLED 1 0 - - Block0
sd rootdisk-02 rootvol-01 ENABLED 1050775 1 - - -

v swapvol swap ENABLED 4198392 - ACTIVE - -
pl swapvol-01 swapvol ENABLED 4198392 - ACTIVE - -
sd rootdisk-01 swapvol-01 ENABLED 4198392 0 - - -

v usr gen ENABLED 4198392 - ACTIVE - -
pl usr-01 usr ENABLED 4198392 - ACTIVE - -
sd rootdisk-03 usr-01 ENABLED 4198392 0 - - -

v var gen ENABLED 4198392 - ACTIVE - -
pl var-01 var ENABLED 4198392 - ACTIVE - -
sd rootdisk-05 var-01 ENABLED 4198392 0 - - -

# /etc/vx/bin/vxunroot

This operation will convert the following file systems from
volumes to regular partitions: root swap usr var opt home

Replace volume rootvol with c0t0d0s0.

This operation will require a system reboot. If you choose to
continue with this operation, system configuration will be updated
to discontinue use of the volume manager for your root and swap
devices.

Do you wish to do this now [y,n,q,?] (default: y)

After a reboot, the root disk will be unencapsulated.