Veritas Volume Manager 5.0 Troubleshooting Guide, HP-UX 11i v3, First Edition, May 2008

37Recovering from boot disk failure
Recovering a system by booting from recovery media
Starting VxVM after booting from recovery media
You can use the vx_emerg_start utility to start VxVM after booting a system
from recovery media. This command allows a rootable VxVM configuration to
be repaired in the event of a catastrophic failure.
To start VxVM after booting from recovery media
1 Type the following command:
# vx_emerg_start hostname
The hostname argument specifies the name (node name) of the system that
you are repairing. This name must match the name of the system that you
are repairing, because it is unlikely to be recorded on the recovery media
from which you booted the system.
Recovering the root volume after VxVM emergency startup
To recover the root volume after VxVM emergency startup
1 After you have used
vx_emerg_start to start VxVM, use the vxprint
command to determine the configuration state.
One common problem is that all the plexes of the root volume, rootvol,
are stale. This would be shown in the STATE field of the
vxprint output as
follows:
TYNAME ASSOC KSTATE LENGTH PLOFFS STATE ...
v rootvol root DISABLED 393216 - ACTIVE ...
plrootvol-01 rootvol DISABLED 393216 - STALE ...
sdrootdisk01-02rootvol-01 ENABLED 393216 0 - ...
plrootvol-02 rootvol DISABLED 393216 - STALE ...
sdrootdisk02-02rootvol-02 ENABLED 393216 0 - ...
(The TUTIL0 and PUTIL0 fields have been removed from the vxprint
output for readability.)
2 The root volume can usually be repaired by using the following command:
# vxvol -g bootdg -f start rootvol
If the root volume is mirrored, recovery is started. Wait until recovery
completes and the command exits. Then run the
fsck command and mount
the root file system as shown here:
# fsck -F vxfs -o full /dev/vx/rdsk/bootdg/rootvol
# mkdir /tmp_mnt
# mount -F vxfs /dev/vx/dsk/bootdg/rootvol /tmp_mnt
The following form of the vx_emerg_start command combines all these
operations in a single command to recover the root volume and its mirrors,
check the root file system, and mount it:
# vx_emerg_start -m hostname