02-21-2002
Maintenance mode is intended only to enable you to rebuild the LVM data in the LIF area of boot disk after it has been damaged. It ignores the LVM data (which is in the LIF file "LABEL" ). There are two cases. Either the area after the boot area is the root filesystem or it is the /stand filesystem. In either case it must be contiguous and it must be an hfs filesystem so the boot program hpux can find the kernel. In maintenance mode, it is assumed to start after the boot area and consume the rest of the disk. But if it is /stand, a file called /stand/rootconf is read (by the kernel) and this is used to find the start of the root filesystem which is also assumed to extend to the end of the disk. This leaves them overlapping each other as well as any other logical volumes.
The result is that the kernel is running and root is mounted with nothing else. At this point you are supposed to rebuild the LVM info in the boot area. This typically involves using mkboot, vgcfgrestore, and lvlnboot. It is crucial that the disk not be synced at all. Either "reboot -n" or cycle power to exit maintenance mode.
Activating the root volume group is explicitly prohibited...doing so may corrupt it.
The kernel knew that oldroot on /dev/root was a mount point but it didn't know that oldroot on /dev/vg00/lvol3 was a mount point. That why you saw a difference.
Was /oldroot pre-existing? Even a "mkdir /oldroot" is very risky in maintenance mode. HP-UX syncs some metadata right away. That might be enough to garble the static data in your root filesystem's superblock, but I'm not sure.
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LEARN ABOUT HPUX
vxdestroy_lvmroot
vxdestroy_lvmroot(1M) vxdestroy_lvmroot(1M)
NAME
vxdestroy_lvmroot - remove LVM root disk and associated LVM volume group
SYNOPSIS
vxdestroy_lvmroot [-v] [-b] lvm_root_disk
DESCRIPTION
The vxdestroy_lvmroot command tears down and removes the LVM volume group associated with the specified physical disk. This is done by
removing the volumes in the volume group and then removing the volume group.
OPTIONS
-b Invokes the setboot command to change the primary boot disk to the VxVM root disk from which the system was booted (if the pri-
mary boot disk is not already set to this disk). The alternate boot device remains unchanged. If the -v option is also speci-
fied, the settings of the primary and alternate boot devices are displayed.
-v Outputs verbose messages including a timestamp that indicates major operations being performed.
ARGUMENTS
lvm_root_disk
Specifies the device name of the LVM root disk that is to be destroyed, along with its entire volume group.
EXAMPLES
This example shows the vxdestroy_lvmroot command invoked in its simpliest form:
/etc/vx/bin/vxdestroy_lvmroot c5t1d0
# /etc/vx/bin/vxdestroy_lvmroot -v -b c3t0d0
Are you sure about destroying c3t0d0 (imported on VG /dev/vg02) ? YES
vxdestroy_lvmroot 06:02: Tearing down /dev/vg02 on device c3t0d0
vxdestroy_lvmroot 06:02:
Unmounting and removing any volumes associated with /dev/vg02
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol1
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol2
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol3
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol4
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol5
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol6
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol7
vxdestroy_lvmroot 06:02: removing logical volume /dev/vg02/lvol8
vxdestroy_lvmroot 06:02: Removing Volume Group /dev/vg02
vxdestroy_lvmroot 06:02: Removing device files in /dev/vg02
vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c3t0d0
vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c1t1d3
vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c1t1d4
vxdestroy_lvmroot 06:02: Removing LVM Physical Volume c1t1d5
vxdestroy_lvmroot 06:03: Current setboot values:
vxdestroy_lvmroot 06:03: Primary: 0/0/6/0/0.0.0
vxdestroy_lvmroot 06:03: Alternate: 0/0/1/0/0.1.0
vxdestroy_lvmroot 06:03:
Making disk c0t1d0 (0/0/1/0/0.1.0) the primary boot disk
vxdestroy_lvmroot 06:03:
Removal of device c3t0d0, volume group /dev/vg02 was successful
SEE ALSO
cpio(1), dd(1), fsck(1M), setboot(1M) vxbootsetup(1M) vxcp_lvmroot(1M) vxres_lvmroot(1M)
VxVM 5.0.31.1 24 Mar 2008 vxdestroy_lvmroot(1M)