Hi,
I had two PVs, hdc (whole disk) and hda4 (partition), in VG vg01. This
VG contains one LV called 'home'.
I wanted to add a 120G disk, hdb, so I did 'pvcreate /dev/hdb'. After
some discusssion it was decided that we did not want to give the whole
disk to LVM, so I partitioned the disk (thinking that the PV structures
would be overwritten that way) and did 'pvcreate /dev/hdb4', the other
three partitions being normal non-LVM partitions.
Then we decided to change our file system to ReiserFS so I added hdb4 to
the vg01 group, created a LV "newhome" inside (spanning the hdb4
partition), formatted this LV with REiserfs, and copied everything from
the (still mounted) 'home' LV over.
Then I rebooted.
After the reboot LVM didn't recognize any VGs any more, told me my four
PVs (!!) belonged to an unknown VG "vg01" and vgscan told me $SUBJECT.
pvscan:
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/ide/host0/bus1/target0/lun0/part1" is associated to unknown VG "vg01" (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part4" is associated to unknown VG "vg01" (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target1/lun0/disc" is associated to unknown VG "vg01" (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target1/lun0/part4" is associated to unknown VG "vg01" (run vgscan)
vgscan:
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group "vg01" from physical volume(s)
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume group
"pvdata" on each of the partitions looks OK, there is vg01 as a volume
group etc:
===========================================================================
(none): root# pvdata /dev/ide/host0/bus1/target0/lun0/part1
--- Physical volume ---
PV Name /dev/ide/host0/bus1/target0/lun0/part1
VG Name vg01
PV Size 12.65 GB [26520417 secs] / NOT usable 1.42 MB [LVM: 242 KB]
PV# 1
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 4096
Total PE 3237
Free PE 0
Allocated PE 3237
PV UUID wO50uo-ApVO-0jmr-4RZC-Ggof-O4Ut-6txGOD
--- Volume group ---
VG Name
VG Access read/write
VG Status NOT available/resizable
VG # 0
MAX LV 256
Cur LV 2
Open LV 0
MAX LV Size 255.99 GB
Max PV 256
Cur PV 3
Act PV 3
VG Size 155.75 GB
PE Size 4 MB
Total PE 39871
Alloc PE / Size 39871 / 155.75 GB
Free PE / Size 0 / 0
VG UUID ijDVbZ-OFN9-izvN-r2aY-nzaA-SzPl-ra9bHg
--- List of logical volumes ---
pvdata -- logical volume "/dev/vg01/home" at offset 0
pvdata -- logical volume "/dev/vg01/newhome" at offset 1
pvdata -- logical volume struct at offset 2 is empty
(...)
pvdata -- logical volume struct at offset 254 is empty
pvdata -- logical volume struct at offset 255 is empty
--- List of physical volume UUIDs ---
001: wO50uo-ApVO-0jmr-4RZC-Ggof-O4Ut-6txGOD
002: glxYRM-F0DD-ByTO-sFPi-wFNd-ju9V-yW7ieU
003: 1yC41U-Jmxg-0NmS-dqKT-Wznu-yYwx-0t92sD
===========================================================================
===========================================================================
(none): root# pvdata /dev/ide/host0/bus0/target0/lun0/part4
--- Physical volume ---
PV Name /dev/ide/host0/bus0/target0/lun0/part4
VG Name vg01
PV Size 36.19 GB [75890304 secs] / NOT usable 3.81 MB [LVM: 266 KB]
PV# 2
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 4096
Total PE 9263
Free PE 0
Allocated PE 9263
PV UUID glxYRM-F0DD-ByTO-sFPi-wFNd-ju9V-yW7ieU
--- Volume group ---
VG Name
VG Access read/write
VG Status NOT available/resizable
VG # 0
MAX LV 256
Cur LV 2
Open LV 0
MAX LV Size 255.99 GB
Max PV 256
Cur PV 3
Act PV 3
VG Size 155.75 GB
PE Size 4 MB
Total PE 39871
Alloc PE / Size 39871 / 155.75 GB
Free PE / Size 0 / 0
VG UUID ijDVbZ-OFN9-izvN-r2aY-nzaA-SzPl-ra9bHg
--- List of logical volumes ---
pvdata -- logical volume "/dev/vg01/home" at offset 0
pvdata -- logical volume "/dev/vg01/newhome" at offset 1
pvdata -- logical volume struct at offset 2 is empty
(...)
pvdata -- logical volume struct at offset 254 is empty
pvdata -- logical volume struct at offset 255 is empty
--- List of physical volume UUIDs ---
001: wO50uo-ApVO-0jmr-4RZC-Ggof-O4Ut-6txGOD
002: glxYRM-F0DD-ByTO-sFPi-wFNd-ju9V-yW7ieU
003: 1yC41U-Jmxg-0NmS-dqKT-Wznu-yYwx-0t92sD
===========================================================================
The current backup of the metadata looks OK as well:
(none): root# vgcfgrestore -ll -n vg01
vgcfgrestore -- INFO: using backup file "/etc/lvmconf/vg01.conf"
--- Volume group ---
VG Name vg01
VG Access read/write
VG Status NOT available/resizable
VG # 0
MAX LV 256
Cur LV 2
Open LV 0
MAX LV Size 255.99 GB
Max PV 256
Cur PV 3
Act PV 3
VG Size 155.75 GB
PE Size 4 MB
Total PE 39871
Alloc PE / Size 39871 / 155.75 GB
Free PE / Size 0 / 0
VG UUID ijDVbZ-OFN9-izvN-r2aY-nzaA-SzPl-ra9bHg
--- Logical volume ---
LV Name /dev/vg01/home
VG Name vg01
LV Write Access read/write
LV Status NOT available
LV # 1
# open 0
LV Size 48.83 GB
Current LE 12500
Allocated LE 12500
Allocation next free
Read ahead sectors 128
Block device 58:0
--- Logical volume ---
LV Name /dev/vg01/newhome
VG Name vg01
LV Write Access read/write
LV Status NOT available
LV # 2
# open 0
LV Size 106.92 GB
Current LE 27371
Allocated LE 27371
Allocation next free
Read ahead sectors 120
Block device 58:1
--- Physical volume ---
PV Name /dev/ide/host0/bus1/target0/lun0/part1
VG Name vg01
PV Size 12.65 GB [26520417 secs] / NOT usable 1.42 MB [LVM: 242 KB]
PV# 1
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 4096
Total PE 3237
Free PE 0
Allocated PE 3237
PV UUID wO50uo-ApVO-0jmr-4RZC-Ggof-O4Ut-6txGOD
--- Physical volume ---
PV Name /dev/ide/host0/bus0/target0/lun0/part4
VG Name vg01
PV Size 36.19 GB [75890304 secs] / NOT usable 3.81 MB [LVM: 266 KB]
PV# 2
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 4096
Total PE 9263
Free PE 0
Allocated PE 9263
PV UUID glxYRM-F0DD-ByTO-sFPi-wFNd-ju9V-yW7ieU
--- Physical volume ---
PV Name /dev/ide/host0/bus0/target1/lun0/part4
VG Name vg01
PV Size 106.92 GB [224235270 secs] / NOT usable 4.35 MB [LVM: 338 KB]
PV# 3
PV Status NOT available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 4096
Total PE 27371
Free PE 0
Allocated PE 27371
PV UUID 1yC41U-Jmxg-0NmS-dqKT-Wznu-yYwx-0t92sD
I want to get at my data. No matter what. At the moment I have twenty
scientists banging at my door because they need to be able to continue their
research.
I actually have their data on the disks twice ... once in the 'home' and once
in the 'newhome' LV. So I need a way to persuade LVM that hdb (the 'disc' PV
above) is no longer to be managed by lvm, _without_ destroying its partition
table (because hdb4 _is_ needed).
Or, to make LVM recognize 'half' a VG (which contains a complete LV though) so
I can get at the 'home' LV or the 'newhome' LV.
Do you have any ideas?
--
mfg, Jens Benecke
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