Corrupted Hard Drive Post: 302382023

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Operating Systems Linux Red Hat Corrupted Hard Drive Post 302382023 by fpmurphy on Monday 21st of December 2009 09:31:52 PM

12-21-2009

Registered User

The kernel panic is due to the nash script interpreter, which is part of initramfs ( switchroot, etc. are nash subcommands), being unable to mount the file systems.

Of more interest is the fact both logical volumes are not available according to the output from lvdisplay

Code:

...
LV Status NOT available
...

If the logical volumes are not available for some reason, then the filesystems on these logical volumes are not available, and thus cannot be mounted.

One possibility is that the LVM metadata is corrupt. LVM maintains the metadata backup in /etc/lvm/backup and /etc/lvm/archive, if you haven't turned off the auto backup feature of LVM. Try restoring the LVM metadata using vgcfgrestore. This should work if the damage to LVM metadata are minor. If the damage to LVM metadata is major, the disk will not be recognized. In such cases, you first need to restore the UUID for the missing device. To do so, compare the output of pvscan and cat /proc/partitions and paste the required UUID using the results of pvscan. You can then use vgcfgrestore to restore LVM metadata. If either of these methods work, make sure to fsck the filesystem(s) before mounting.

fpmurphy

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LEARN ABOUT FREEBSD

vgcfgrestore

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

NAME

       vgcfgrestore - restore volume group descriptor area

SYNOPSIS

       vgcfgrestore [-d|--debug] [-f|--file filename] [-l[l]|--list] [-h|--help] [-M|--Metadatatype1|2] [-t|--test] [-v|--verbose] VolumeGroupName

DESCRIPTION

       vgcfgrestore  allows  you  to  restore  the metadata of VolumeGroupName from a text backup file produced by vgcfgbackup.  You can specify a
       backup file with --file.  If no backup file is specified, the most recent one is used.  Use --list for a list of the available  backup  and
       archive files of VolumeGroupName.

OPTIONS

       -l | --list -- List files pertaining to VolumeGroupName
	      List  metadata  backup  and  archive  files  pertaining  to VolumeGroupName.  May be used with the -f option.  Does not restore Vol-
	      umeGroupName.

       -f | --file filename -- Name of LVM metadata backup file
	      Specifies a metadata backup or archive file to be used for restoring VolumeGroupName.  Often this file has been created with  vgcfg-
	      backup.

       See lvm for common options.

REPLACING PHYSICAL VOLUMES

       vgdisplay  --partial  --verbose will show you the UUIDs and sizes of any PVs that are no longer present.  If a PV in the VG is lost and you
       wish to substitute another of the same size, use pvcreate --restorefile filename --uuid uuid (plus additional arguments as appropriate)	to
       initialise  it with the same UUID as the missing PV.  Repeat for all other missing PVs in the VG.  Then use vgcfgrestore --file filename to
       restore the volume group's metadata.

SEE ALSO

       lvm(8), vgcreate(8)

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