[mythtv-users] LVM Problem -- Please Help

Tom+Dale tdmyth at yahoo.com
Tue Sep 12 01:31:08 EDT 2006


Tom+Dale <tdmyth at yahoo.com> wrote: "gLaNDix (Jesse Kaufman)" <glandix at lloydnet.org> wrote: Tom+Dale wrote:

> Now I didn't know what else to try so I guessed at a few commands 
> without any succes. I'm floundering here...can anyone suggest anything 
> else to try?  Did I somehow lose the data?  It seems to me that I should 
> be able to access it still.  I feel like I just need to tell the system 
> how to find the logical volume LogVol00.  It doesn't show up under /dev, 
> but I don't know if that matters.

it looks like most of what i'm seeing is vg* and pv* commands ... have 
you tried any of the lv* commands?  for instance, lvdiskscan, lvscan, 
lvdisplay, or lvchange?  for details on them, read the man pages, since 
i just quickly ran through a few that looked like they might be related 
to figuring more info  out

-g-



Thanks for the response.  I guess I should have mentioned the results from lv* commands I tried (lvdiskscan appears not to be a Fedora command).  I'm afraid to do anything with lvcreate because I don't want to step on what's there--unless I am misunderstanding how things work.  It looks to me like the volume group is there, but the system can't find or doesn't know the label.  I wonder how to tell it that the label was LogVol00.

Here are some results:

[root at mythserver ~]# lvchange -vvvay /dev/VolGroup00/LogVol00
        Processing: lvchange -vvvay /dev/VolGroup00/LogVol00
        O_DIRECT will be used
      Setting global/locking_type to 1
      Setting global/locking_dir to /var/lock/lvm
      File-based locking  enabled.
    Using logical volume(s) on command line
      Locking /var/lock/lvm/V_VolGroup00 WB
        Opened /dev/sda RW
        /dev/sda: block size is 4096 bytes
      /dev/sda: No label detected
        Opened /dev/hda1 RW
        /dev/hda1: block size is 1024 bytes
      /dev/hda1: No label detected
        Opened /dev/hda2 RW
        /dev/hda2: block size is 4096 bytes
      /dev/hda2: No label detected
        Opened /dev/hda3 RW
        /dev/hda3: block size is 4096 bytes
      /dev/hda3: No label  detected
        Opened /dev/hda5 RW
        /dev/hda5: block size is 512 bytes
      /dev/hda5: lvm2 label detected
        lvmcache: /dev/hda5 now orphaned
        lvmcache: /dev/hda5 now in VG VolGroup00
        Opened /dev/hdb RW
        /dev/hdb: block size is 4096 bytes
      /dev/hdb: lvm2 label detected
        lvmcache: /dev/hdb now orphaned
        lvmcache: /dev/hdb now in VG VolGroup00
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
      /dev/hda5: lvm2 label  detected
      /dev/hdb: lvm2 label detected
        Read VolGroup00 metadata (11) from /dev/hda5 at 18944 size 720
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
        Read VolGroup00 metadata (11) from /dev/hdb at 16896 size 720
  One or more specified logical volume(s) not found.
      Unlocking /var/lock/lvm/V_VolGroup00
        Closed /dev/sda
        Closed /dev/hda1
        Closed /dev/hda2
        Closed /dev/hda3
        Closed /dev/hda5
        Closed /dev/hdb
[root at mythserver ~]# lvscan  -vvv
        Processing: lvscan -vvv
        O_DIRECT will be used
      Setting global/locking_type to 1
      Setting global/locking_dir to /var/lock/lvm
      File-based locking enabled.
    Finding all logical volumes
        Opened /dev/sda RO
        /dev/sda: block size is 4096 bytes
      /dev/sda: No label detected
        Closed /dev/sda
        Opened /dev/hda1 RO
        /dev/hda1: block size is 1024 bytes
      /dev/hda1: No label detected
        Closed  /dev/hda1
        Opened /dev/hda2 RO
        /dev/hda2: block size is 4096 bytes
      /dev/hda2: No label detected
        Closed /dev/hda2
        Opened /dev/hda3 RO
        /dev/hda3: block size is 4096 bytes
      /dev/hda3: No label detected
        Closed /dev/hda3
        Opened /dev/hda5 RO
        /dev/hda5: block size is 512 bytes
      /dev/hda5: lvm2 label detected
        Closed /dev/hda5
        lvmcache: /dev/hda5 now orphaned
        Opened /dev/hda5  RO
        /dev/hda5: block size is 512 bytes
        Closed /dev/hda5
        lvmcache: /dev/hda5 now in VG VolGroup00
        Opened /dev/hdb RO
        /dev/hdb: block size is 4096 bytes
      /dev/hdb: lvm2 label detected
        Closed /dev/hdb
        lvmcache: /dev/hdb now orphaned
        Opened /dev/hdb RO
        /dev/hdb: block size is 4096 bytes
        Closed /dev/hdb
        lvmcache: /dev/hdb now in VG VolGroup00
      Locking /var/lock/lvm/V_VolGroup00  RB
        Opened /dev/hda5 RO
        /dev/hda5: block size is 512 bytes
      /dev/hda5: lvm2 label detected
        Opened /dev/hdb RO
        /dev/hdb: block size is 4096 bytes
      /dev/hdb: lvm2 label detected
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
        Read VolGroup00 metadata (11) from /dev/hda5 at 18944 size 720
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
        Read VolGroup00 metadata (11) from /dev/hdb at 16896 size 720
      Unlocking  /var/lock/lvm/V_VolGroup00
        Closed /dev/hda5
        Closed /dev/hdb
[root at mythserver ~]# lvdisplay -vvv
        Processing: lvdisplay -vvv
        O_DIRECT will be used
      Setting global/locking_type to 1
      Setting global/locking_dir to /var/lock/lvm
      File-based locking enabled.
    Finding all logical volumes
        Opened /dev/sda RO
        /dev/sda: block size is 4096 bytes
      /dev/sda: No label detected
        Closed /dev/sda
        Opened /dev/hda1 RO
        /dev/hda1: block  size is 1024 bytes
      /dev/hda1: No label detected
        Closed /dev/hda1
        Opened /dev/hda2 RO
        /dev/hda2: block size is 4096 bytes
      /dev/hda2: No label detected
        Closed /dev/hda2
        Opened /dev/hda3 RO
        /dev/hda3: block size is 4096 bytes
      /dev/hda3: No label detected
        Closed /dev/hda3
        Opened /dev/hda5 RO
        /dev/hda5: block size is 512 bytes
      /dev/hda5: lvm2 label detected
        Closed  /dev/hda5
        lvmcache: /dev/hda5 now orphaned
        Opened /dev/hda5 RO
        /dev/hda5: block size is 512 bytes
        Closed /dev/hda5
        lvmcache: /dev/hda5 now in VG VolGroup00
        Opened /dev/hdb RO
        /dev/hdb: block size is 4096 bytes
      /dev/hdb: lvm2 label detected
        Closed /dev/hdb
        lvmcache: /dev/hdb now orphaned
        Opened /dev/hdb RO
        /dev/hdb: block size is 4096 bytes
        Closed  /dev/hdb
        lvmcache: /dev/hdb now in VG VolGroup00
      Locking /var/lock/lvm/V_VolGroup00 RB
        Opened /dev/hda5 RO
      /dev/hda5: block size is 512 bytes
      /dev/hda5: lvm2 label detected
        Opened /dev/hdb RO
        /dev/hdb: block size is 4096 bytes
      /dev/hdb: lvm2 label detected
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
        Read VolGroup00 metadata (11) from /dev/hda5 at 18944 size 720
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label  detected
        Read VolGroup00 metadata (11) from /dev/hdb at 16896 size 720
      Unlocking /var/lock/lvm/V_VolGroup00
        Closed /dev/hda5
        Closed /dev/hdb


Greetings to all:
This followup is for the benefit of those who may run into a similar problem in the future.  I was, at last, able to solve this problem.  I was right all along...the data was there.  So when I started experimenting with the archive files associated with LVM, I stumbled on success.  Someone suggested "vgcfgrestore" might work; however, I had to use trial & error with the -t (test) parameter in order to figure this out.  By that I mean reading the LVM HowTo and various man pages did not clarify much for me.  So here are the steps that I took:
--------------------------------------------------------
[root at mythserver lvm]# vgcfgrestore -tf /etc/lvm/archive/VolGroup00_00000.vg
  Test mode: Metadata will NOT be updated.
  Please specify a *single* volume group to restore.
[root at mythserver lvm]# vgcfgrestore -tf /etc/lvm/archive/VolGroup00_00000.vg Vol
Group00
  Test mode: Metadata will NOT be updated.
  Restored volume group VolGroup00
[root at mythserver lvm]# vgcfgrestore -tvf /etc/lvm/archive/VolGroup00_00000.vg Vo
lGroup00
  Test mode: Metadata will NOT be updated.
  Restored volume group VolGroup00
    Test mode: Wiping internal cache
    Wiping internal VG cache
[root at mythserver lvm]# vgcfgrestore -tvvf /etc/lvm/archive/VolGroup00_00000.vg V
olGroup00
  Test mode: Metadata will NOT be updated.
      Setting global/locking_type to  1
      Setting global/locking_dir to /var/lock/lvm
      File-based locking enabled.
      Locking /var/lock/lvm/P_orphans WB
      Locking /var/lock/lvm/V_VolGroup00 W 
      /dev/hda1: No label detected
      /dev/hda2: No label detected
      /dev/hda3: No label detected
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
  Restored volume group VolGroup00
      Unlocking /var/lock/lvm/V_VolGroup00
      Unlocking /var/lock/lvm/P_orphans
    Test mode: Wiping internal  cache
    Wiping internal VG cache
[root at mythserver lvm]# vgcfgrestore -vvf /etc/lvm/archive/VolGroup00_00000.vg Vo
lGroup00
      Setting global/locking_type to 1
      Setting global/locking_dir to /var/lock/lvm
      File-based locking enabled.
      Locking /var/lock/lvm/P_orphans WB
      Locking /var/lock/lvm/V_VolGroup00 W 
      /dev/hda1: No label detected
      /dev/hda2: No label detected
      /dev/hda3: No label detected
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
      /dev/hda5: lvm2 label detected
      /dev/hdb: lvm2 label detected
  Restored volume group  VolGroup00
      Unlocking /var/lock/lvm/V_VolGroup00
      Unlocking /var/lock/lvm/P_orphans
[root at mythserver lvm]# lvscan
  inactive          '/dev/VolGroup00/LogVol00' [364.21 GB] inherit
[root at mythserver lvm]# lvchange -tv -ay /dev/VolGroup00/LogVol00
  Test mode: Metadata will NOT be updated.
    Using logical volume(s) on command line
    Activating logical volume "LogVol00"
    Found volume group "VolGroup00"
    Test mode: Wiping internal cache
    Wiping internal VG cache
[root at mythserver lvm]# lvchange -v -ay /dev/VolGroup00/LogVol00
    Using logical volume(s) on command line
    Activating logical volume "LogVol00"
    Found volume group "VolGroup00"
    Loading  VolGroup00-LogVol00
[root at mythserver lvm]# mount -a
------------------------------------------------------------------------
That did it!  We were able to copy our data off the volume and recover the whole system.  I hope this helps someone else down the road.

-Tom-


 		
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