[linux-lvm] Can't find physical volume / vgcfgrestore not helping (Success!!)

[Bryan Ragon]

-----Original Message-----
>> On Wed, Mar 16, 2005 at 10:30:42AM -0500, Bryan Ragon wrote:
>> # fdisk -l /dev/hdb
>> /dev/hdb1               1       14593   117218241   83  Linux
 
>> (Is that a proper Id? Plus, looking at my media_vg backup, I don't 
>> believe there should be a partition because the hint is /dev/hdb, not 
>> /dev/hdb1)
 
>>                         device = "/dev/hdb"     # Hint only

>Chances are you didn't remove the partition table before using the entire
unpartitioned device as a physical 
>volume, or ran pvcreate on /dev/hdb when you intended to use hdb1.

>(Recent lvm2 versions of pvcreate handle this better.)

>Try removing the partition table.

>[eg delete the partition with fdisk/parted, or write 512 zero bytes to the
start of /dev/hdb - 
>back it up first - and run blockdev --rereadpt]


Here is a detailed list of steps that worked:

;; first backed up the first 512 bytes of /dev/hdb
# dd if=/dev/hdb of=~/hdb.first512 count=1 bs=512
1+0 records in
1+0 records out
 

;; zero them out, per Alasdair
# dd if=/dev/zero of=/dev/hdb count=1 bs=512
1+0 records in
1+0 records out

;; verified
# blockdev --rereadpt /dev/hdb
BLKRRPART: Input/output error

;; find the volumes
# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "media_vg" using metadata type lvm2

# pvscan
  PV /dev/hdb   VG media_vg   lvm2 [111.79 GB / 0    free]
  Total: 1 [111.79 GB] / in use: 1 [111.79 GB] / in no VG: 0 [0   ]

# lvmdiskscan
  /dev/hda1 [      494.16 MB]
  /dev/hda2 [        1.92 GB]
  /dev/hda3 [       18.65 GB]
  /dev/hdb  [      111.79 GB] LVM physical volume
  /dev/hdd1 [       71.59 GB]
  0 disks
  4 partitions
  1 LVM physical volume whole disk
  0 LVM physical volumes

# vgchange -a y
  1 logical volume(s) in volume group "media_vg" now active

;; /media is a defined mount point in fstab, listed below for future archive
searches
# mount /media
# ls /media
graphics  lost+found  movies  music


Success!!  Thank you, Alasdair!!!!

/etc/fstab
<snip>
/dev/media_vg/media_lv  /media          ext3            noatime
0 0
<snip>