[linux-lvm] Can't mount after crash

[Daniel Roth <daniel@danielroth.se>]

Hi all!

My lvm-system crashed a day ago and I was really lost in how to do. Buy 
I found the metadatafile and could with
pvcreate --uuid ... --restorefile ... .... /hdg5,
pvcreate --uuid ... --restorefile ... .... /hdi1,
restore those two drives. It didnt work with just /hdg/hdi as the 
metafile decribes. hde couldn't be fixed with the restoredfile command, 
it said that it was to small or equiv, so I just did a pvcreate --uuid 
... /hde1

my lvm version is 2.00.29.

After this I did the vgcfgrestore from the metadatafile, 
my_volume_group, which worked fine, and finally I hade to do a vgmknodes 
my_volume_group which also worked fine. But then when I tried to the lv 
I get this

roth:/dev# mount /dev/my_volume_group/mylv /disk
/dev/my_volume_group/mylv: Invalid argument
mount: you must specify the filesystem type
roth:/dev# mount -t ext2 /dev/my_volume_group/mylv /disk
mount: wrong fs type, bad option, bad superblock on 
/dev/my_volume_group/mylv,
       missing codepage, or too many mounted file systems
       (could this be the IDE device where you in fact use
       ide-scsi so that sr0 or sda or so is needed?)

so I tried to fsck it but nothing worked. What have I done wrong? How 
can I get back my data?
I'll paste some shelldumps as help.

Regards

Daniel

----
roth:/dev# lvscan
  ACTIVE            '/dev/my_volume_group/mylv' [282.05 GB] inherit
roth:/dev# lvmdiskscan
  /dev/hda1  [        2.05 GB]
  /dev/hde1  [       76.69 GB] LVM physical volume
  /dev/hdg1  [        1.00 KB]
  /dev/hdi1  [      149.05 GB] LVM physical volume
  /dev/hda2  [        1.00 KB]
  /dev/hda5  [      346.47 MB]
  /dev/hdg5  [       57.25 GB] LVM physical volume
  0 disks
  4 partitions
  0 LVM physical volume whole disks
  3 LVM physical volumes
roth:/dev# lvdisplay
  --- Logical volume ---
  LV Name                /dev/my_volume_group/mylv
  VG Name                my_volume_group
  LV UUID                jUl5rP-jVIH-5Ne1-p0y9-VTeL-P8su-UF2o2F
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                282.05 GB
  Current LE             72204
  Segments               3
  Allocation             inherit
  Read ahead sectors     0
  Block device           254:0


roth:/dev# pvdisplay
  --- Physical volume ---
  PV Name               /dev/hdi1
  VG Name               my_volume_group
  PV Size               149.05 GB / not usable 0
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              38156
  Free PE               0
  Allocated PE          38156
  PV UUID               3Pv4bt-9E47-aDii-mJbB-6OYc-pCFS-7dOBv9

  --- Physical volume ---
  PV Name               /dev/hde1
  VG Name               my_volume_group
  PV Size               76.69 GB / not usable 0
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              19633
  Free PE               0
  Allocated PE          19633
  PV UUID               jfqDXu-rwu3-9SyS-U39k-O6TL-M7Kj-0QDpwB

  --- Physical volume ---
  PV Name               /dev/hdg5
  VG Name               my_volume_group
  PV Size               57.25 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              14656
  Free PE               241
  Allocated PE          14415
  PV UUID               6erEsN-BDBw-KFnO-voBg-FtJu-vUVD-D0SH0p


roth:/dev# cat /etc/lvm/backup/my_volume_group
# Generated by LVM2: Fri Dec 10 22:31:29 2004

contents = "Text Format Volume Group"
version = 1

description = "Created *after* executing '/sbin/vgcfgbackup'"

creation_host = "roth"  # Linux roth 2.4.22 #8 SMP Mon Apr 5 05:19:01 
CEST 2004 i686
creation_time = 1102714289      # Fri Dec 10 22:31:29 2004

my_volume_group {
        id = "73sskf-3Yve-YD3u-iHIt-pX5X-Va4f-iXC1i7"
        seqno = 4
        status = ["RESIZEABLE", "READ", "WRITE"]
        extent_size = 8192              # 4 Megabytes
        max_lv = 255
        max_pv = 255

        physical_volumes {

                pv0 {
                        id = "3Pv4bt-9E47-aDii-mJbB-6OYc-pCFS-7dOBv9"
                        device = "/dev/hdi"     # Hint only

                        status = ["ALLOCATABLE"]
                        pe_start = 384
                        pe_count = 38156        # 149.047 Gigabytes
                }

                pv1 {
                        id = "jfqDXu-rwu3-9SyS-U39k-O6TL-M7Kj-0QDpwB"
                        device = "/dev/hde"     # Hint only

                        status = ["ALLOCATABLE"]
                        pe_start = 384
                        pe_count = 19633        # 76.6914 Gigabytes
                }

                pv2 {
                        id = "6erEsN-BDBw-KFnO-voBg-FtJu-vUVD-D0SH0p"
                        device = "/dev/hdg"     # Hint only

                        status = ["ALLOCATABLE"]
                        pe_start = 384
                        pe_count = 14656        # 57.25 Gigabytes
                }
        }

        logical_volumes {

                mylv {
                        id = "jUl5rP-jVIH-5Ne1-p0y9-VTeL-P8su-UF2o2F"
                        status = ["READ", "WRITE", "VISIBLE"]
                        segment_count = 3

                        segment1 {
                                start_extent = 0
                                extent_count = 38156    # 149.047 Gigabytes

                                type = "striped"
                                stripe_count = 1        # linear

                                stripes = [
                                        "pv0", 0
                                ]
                        }
                        segment2 {
                                start_extent = 38156
                                extent_count = 19633    # 76.6914 Gigabytes

                                type = "striped"
                                stripe_count = 1        # linear

                                stripes = [
                                        "pv1", 0
                                ]
                        }
                        segment3 {
                                start_extent = 57789
                                extent_count = 14415    # 56.3086 Gigabytes

                                type = "striped"
                                stripe_count = 1        # linear

                                stripes = [
                                        "pv2", 0
                                ]
                        }
                }
        }
}
roth:/dev# pvscan
....
  PV /dev/hdi1   VG my_volume_group   lvm2 [149.05 GB / 0    free]
  PV /dev/hde1   VG my_volume_group   lvm2 [76.69 GB / 0    free]
  PV /dev/hdg5   VG my_volume_group   lvm2 [57.25 GB / 964.00 MB free]
  Total: 3 [282.99 GB] / in use: 3 [282.99 GB] / in no VG: 0 [0   ]

roth:/dev# vgscan
  Found volume group "my_volume_group" using metadata type lvm2