Volume group inaccessable after RAID metadice trouble.

Hi!

I have find myself in a troublesome spot. After a disk failure, with lots of IDE bus timeouts etc i managed to get the disk in error replaced and my raid5 set in full operation. But i can't get the volume group active any more. The volume group in question is VG1.

I have read one year worth of messages in this list archives, and i still can't se how i can recover my VG1.

Please find the details below

dent:/etc/lvmconf >sudo pvdata --version
pvdata: Logical Volume Manager 1.0.1-rc4
Heinz Mauelshagen, Sistina Software 03/10/2001 (IOP 10)

dent:/etc/lvmconf >uname -a
Linux dent 2.4.17 #4 Thu Jan 3 00:39:34 CET 2002 alpha unknown
The kernel is compiled with the lvm-1.0.1-rc4-2.4.17 patch.

dent:~ >sudo pvscan
Password:
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/md0" is associated to an unknown VG (run vgscan)

pvscan -- ACTIVE   PV "/dev/sda7"  of VG "vg0" [1.86 GB / 0 free]
pvscan -- ACTIVE   PV "/dev/sda8"  of VG "vg0" [1.86 GB / 0 free]
pvscan -- ACTIVE   PV "/dev/sda9"  of VG "vg0" [68.00 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/sda10" of VG "vg0" [68.00 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/sda11" of VG "vg0" [68.00 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/sda12" of VG "vg0" [68.00 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/sda13" of VG "vg0" [56.00 MB / 0 free]

pvscan -- WARNING: physical volume "/dev/hdg1" belongs to a meta device pvscan -- WARNING: physical volume "/dev/hde1" belongs to a meta device pvscan -- total: 10 [41.37 GB] / in use: 10 [41.37 GB] / in no VG: 0 [0]

dent:~ >sudo vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found active volume group "vg1"
vgscan -- ERROR "lv_read_all_lv(): number of LV" can't get data of volume group "vg1" from physical volume(s) vgscan -- found active volume group "vg0"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume groups

dent:~ >sudo vgchange -a y vg1
vgchange -- volume group "vg1" does not exist

dent:~ >sudo vgcfgrestore -l -l -n vg1
--- Volume group ---

VG Name               vg1
VG Access             read/write
VG Status             NOT available/resizable
VG #                  1
MAX LV                255
Cur LV                1
Open LV               0
MAX LV Size           255.99 GB
Max PV                255
Cur PV                1
Act PV                1
VG Size               37.29 GB
PE Size               4.00 MB
Total PE              9545
Alloc PE / Size       9324 / 36.42 GB
Free  PE / Size       221 / 884.00 MB
VG UUID               gK6O7c-YSy6-SHqF-6oiZ-L47x-PLqR-JsJzDq

--- Logical volume ---

LV Name                /dev/vg1/lv1
VG Name                vg1
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 0
LV Size                36.42 GB
Current LE             9324
Allocated LE           9324
Allocation             next free
Read ahead sectors     120
Block device           58:1

--- Physical volume ---

PV Name               /dev/md0
VG Name               vg1
PV Size               37.29 GB / NOT usable 5.62 MB [LVM: 161.00 KB]
PV#                   1
PV Status             available
Allocatable           yes
Cur LV                1
PE Size (KByte)       4096
Total PE              9545
Free PE               221
Allocated PE          9324
PV UUID               6qOL59-G611-Groj-PMBU-y4lg-ZtdX-IhaOuQ

dent:~ >cat /proc/mdstat
Personalities : [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid5 hdg1[2] hdf1[1] hde1[0]

     39102080 blocks level 5, 32k chunk, algorithm 2 [3/3] [UUU]

dent:~ >sudo pvdisplay /dev/md0
--- Physical volume ---

PV Name               /dev/md0
VG Name               vg1
PV Size               37.29 GB / NOT usable 5.62 MB [LVM: 161.00 KB]
PV#                   1
PV Status             available
Allocatable           yes
Cur LV                1
PE Size (KByte)       4096
Total PE              9545
Free PE               221
Allocated PE          9324
PV UUID               6qOL59-G611-Groj-PMBU-y4lg-ZtdX-IhaOuQ

dent:~ >sudo pvdata -v -L /dev/md0

--- List of logical volumes ---

--- Logical volume ---

LV Name                /dev/vg1/lv1
VG Name                vg1
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 0
LV Size                36.42 GB
Current LE             9324
Allocated LE           9324
Allocation             next free
Read ahead sectors     120
Block device           58:0

read_ahead: 120

pvdata -- logical volume struct at offset   1 is empty
pvdata -- logical volume struct at offset   2 is empty
pvdata -- logical volume struct at offset   3 is empty
pvdata -- logical volume struct at offset   4 is empty

-- stuff deleted --
pvdata -- logical volume struct at offset 160 is empty pvdata -- logical volume struct at offset 161 is inconsistent pvdata -- logical volume struct at offset 162 is inconsistent pvdata -- logical volume struct at offset 163 is empty -- stuff deleted --
pvdata -- logical volume struct at offset 253 is empty pvdata -- logical volume struct at offset 254 is empty

dent:/etc/lvmconf >sudo pvdata -UPV /dev/md0
--- Physical volume ---

PV Name               /dev/md0
VG Name               vg1
PV Size               37.29 GB / NOT usable 5.62 MB [LVM: 161.00 KB]
PV#                   1
PV Status             available
Allocatable           yes
Cur LV                1
PE Size (KByte)       4096
Total PE              9545
Free PE               221
Allocated PE          9324
PV UUID               6qOL59-G611-Groj-PMBU-y4lg-ZtdX-IhaOuQ

--- Volume group ---
VG Name VG Access read/write

VG Status             NOT available/resizable
VG #                  0
MAX LV                255
Cur LV                1
Open LV               0
MAX LV Size           255.99 GB
Max PV                255
Cur PV                1
Act PV                1
VG Size               37.29 GB
PE Size               4.00 MB
Total PE              9545
Alloc PE / Size       9324 / 36.42 GB
Free  PE / Size       221 / 884.00 MB
VG UUID               gK6O7c-YSy6-SHqF-6oiZ-L47x-PLqR-JsJzDq

--- List of physical volume UUIDs ---

001: 6qOL59-G611-Groj-PMBU-y4lg-ZtdX-IhaOuQ

dent:~ >sudo vgcfgrestore -v -n vg1 -t /dev/md0
vgcfgrestore -- locking logical volume manager
vgcfgrestore -- restoring volume group "vg1" from "/etc/lvmconf/vg1.conf" vgcfgrestore -- checking existence of "/etc/lvmconf/vg1.conf" vgcfgrestore -- reading volume group data for "vg1" from "/etc/lvmconf/vg1.conf" vgcfgrestore -- reading physical volume data for "vg1" from "/etc/lvmconf/vg1.conf" vgcfgrestore -- reading logical volume data for "vg1" from "/etc/lvmconf/vg1.conf" vgcfgrestore -- checking volume group consistency of "vg1" vgcfgrestore -- checking volume group consistency of "vg1" vgcfgrestore -- backup of volume group "vg1" is consistent vgcfgrestore -- test run for volume group "vg1" end

vgcfgrestore -- unlocking logical volume manager

dent:~ >sudo vgcfgrestore -v -n vg1 /dev/md0
vgcfgrestore -- can't restore part of active volume group "vg1" vgcfgrestore [-d|--debug] [-f|--file VGConfPath] [-l[l]|--list [--list]]
[-n|--name VolumeGroupName] [-h|--help]
[-o|--oldpath OldPhysicalVolumePath] [-t|--test] [-v|--verbose] [--version] [PhysicalVolumePath]

Regards Martin

Martin,

based on the error (vgscan -- ERROR "lv_read_all_lv(): number of LV" can't get data of volume group "vg1" from physical volume(s)), it looks like vgscan counts a different number rather than 1 LV scanning the on-disk table of LV structures.

Could you send the output of "vgscan -d" to me in private email ([email protected]) and attach the file Martin_md0.vgda you created with "dd if=/dev/md0 of=Martin_md0.vgda bs=1k count=1024" as well for further investigation.

Regards,
Heinz -- The LVM Guy --

*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf Germany
[email protected] +49 2626 141200

                                                       FAX 924446

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