HP-UX LVM Maint. Mode Post: 15919

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Operating Systems HP-UX HP-UX LVM Maint. Mode Post 15919 by Perderabo on Thursday 21st of February 2002 11:28:38 AM

02-21-2002

Administrator Emeritus

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.

Perderabo

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LEARN ABOUT FREEBSD

geom_linux_lvm

GEOM_LINUX_LVM(4)					   BSD Kernel Interfaces Manual 					 GEOM_LINUX_LVM(4)

NAME

     geom_linux_lvm -- GEOM based Linux LVM logical volume mapping

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel configuration file:

	   options GEOM_LINUX_LVM

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   geom_linux_lvm_load="YES"

DESCRIPTION

     The geom_linux_lvm framework provides support for mapping Linux LVM volumes to GEOM providers.  geom_linux_lvm currently supports linear
     stripes with segments on one or more physical disks.  The parser is able to read LVM2 Text Format metadata, the logical volumes will be
     assembled and made available under /dev/linux_lvm/.  The metadata is read-only, logical volumes cannot be allocated or resized.

EXAMPLES

     To view which geom_linux_lvm devices are available:

	   # geom linux_lvm list
	   Geom name: vg1
	   Providers:
	   1. Name: linux_lvm/vg1-home
	      Mediasize: 4294967296 (4.0G)
	      Sectorsize: 512
	      Mode: r0w0e0
	   2. Name: linux_lvm/vg1-logs
	      Mediasize: 4294967296 (4.0G)
	      Sectorsize: 512
	      Mode: r0w0e0
	   Consumers:
	   1. Name: ada0s1
	      Mediasize: 80023716864 (75G)
	      Sectorsize: 512
	      Mode: r0w0e0

SEE ALSO

     GEOM(4), geom(8)

AUTHORS

     The geom_linux_lvm driver was written by Andrew Thompson <thompsa@FreeBSD.org>.

BSD
								  October 1, 2013							       BSD