HP-UX LVM Maint. Mode Post: 15911

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Operating Systems HP-UX HP-UX LVM Maint. Mode Post 15911 by LivinFree on Thursday 21st of February 2002 01:46:44 AM

02-21-2002

Registered User

HP-UX LVM Maint. Mode

What exactly happens when you boot HP-UX with the -lm flag?

Quote:

hpux -lm

We tried this the other night, with some wacky results...
We poked around, and found that / was mounted to /dev/rroot (I think... maybe it was just /dev/root). So, (still playing) we activated the volume group (lvchange -ay), and created a directory /oldroot. We mounted /dev/vg00/lvol3 to /oldroot (after running fsck), then changed directory to /oldroot. There, to our disbelief, was a new directory (mixed in with the others) called "/oldroot". That's a wierd thing to see... But THAT oldroot was empty, so it wasn't totally recursive.

We unmounted everything and rebooted... Upon coming back up, the machine rebooted again automatically (a guess is that we forgot to deactive the volume group first, so it fixed out mistake and rebooted), then hung for about 20 minutes upon reaching the cleaning of editor crash files. It bounced back and forth from "busy" to "wait"...

So how did that happen? Is /dev/rroot just the raw device attached to the / filesystem? If so, how could it be mounted? And how could it be mounted twice?

I think my head is about to implode, so I had better stop typing...

LivinFree

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pvck

PVCK(8)                                                       System Manager's Manual                                                      PVCK(8)

NAME

       pvck - check physical volume metadata

SYNOPSIS

       pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]

DESCRIPTION

       pvck checks physical volume LVM metadata for consistency.

OPTIONS

       See lvm for common options.

       --labelsector sector
              By  default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0.  This parameter allows you to specify a
              different starting sector for the scan and is useful for recovery situations.  For example, suppose the partition table is corrupted
              or  lost  on  /dev/sda, but you suspect there was an LVM partition at approximately 100 MB.  This area of the disk may be scanned by
              using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):

              pvck --labelsector 204800 /dev/sda

              Note that a script can be used with --labelsector to automate the process of finding LVM labels.

SEE ALSO

       lvm(8), pvcreate(8), pvscan(8) vgck(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                                 PVCK(8)