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Re: [linux-lvm] vgscan problem (was vgscan segmentation faults,VG name problems)



pvscan only finds hde -- good, as that's all it should.
...so I did as you suggested: pvcreate -ff /dev/hde; vgcfgrestore -n data_group /dev/hde; vgscan returned:
#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 "data_group" 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


I think this is the same problem as before.
There exists /etc/lvmconf/data_group.conf and /etc/lvmconf/data_group.conf.1.old. Testing this volume group descriptor data:
# vgcfgrestore -t -l -n data_group /dev/hde
vgcfgrestore -- INFO: using backup file "/etc/lvmconf/data_group.conf"
vgcfgrestore -- backup of volume group "data_group" is consistent
--- Volume group ---
VG Name data_group
VG Access read/write
VG Status NOT available/resizable
VG # 0
MAX LV 256
Cur LV 1
Open LV 0
MAX LV Size 255.99 GB
Max PV 256
Cur PV 1
Act PV 1
VG Size 111.79 GB
PE Size 4 MB
Total PE 28617
Alloc PE / Size 25600 / 100 GB
Free PE / Size 3017 / 11.79 GB
VG UUID rVEO6Y-kq5c-5SR0-uw0I-VPF1-v1ka-HK1WQS


# vgcfgrestore -t -b 1 -l -n data_group /dev/hde
vgcfgrestore -- INFO: using backup file "/etc/lvmconf/data_group.conf.1.old"
vgcfgrestore -- backup of volume group "data_group"  is consistent
--- Volume group ---
VG Name               data_group
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                0
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                1
Act PV                1
VG Size               111.79 GB
PE Size               4 MB
Total PE              28617
Alloc PE / Size       0 / 0
Free  PE / Size       28617 / 111.79 GB
VG UUID               rVEO6Y-kq5c-5SR0-uw0I-VPF1-v1ka-HK1WQS

The first old backup has 0 allocatings, so I don't want this. The most recent backup file seems to have an error. If the error is in /etc/lvmconf/data_group.conf, how can I recreate the volume group descriptor area without touching the data?
Thanks


PS
I think I may want to move from a LVM newbee to a LVM tyro (ie. understand the descriptor area and metadata data structures -- you know at the "a little knowledge is a dangerous thing" level -- about 2 or 3 levels down from expert :) ). Where's the best place to start to learn?


Heinz J . Mauelshagen wrote:

Duane,

does pvscan evetually find more than hde (which I assume should be your
_only_ PV in the system) ?
If so, you need to decide, if those can be removed (pvcreate -ff ...).

If not, you might want to restore the metadata to hde and rescan+activate.
(pvcreate -ff /dev/hde;vgcfgrestore -n data_group /dev/hde;vgscan;vgchange -ay).

pvcreate doesn't destroy any data, it just initializes the LVM metadata area
for vgcfgrestore to work.

Regards,
Heinz    -- The LVM Guy --


On Tue, Apr 29, 2003 at 07:36:40PM -0600, Duane Evenson wrote:


I've upgraded to 1.0.7 but now get the following output - indicating the real problem.
If I recreate the volume group and logical volume, will the data contained therein still be available or is there another way to recover the volume?
vgscan -v
vgscan -- removing "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- creating empty "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- scanning for all active volume group(s) first
vgscan -- reading data of volume group "data_group" from physical volume(s)
vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume
group "data_group" 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


Some other information of the system:

# pvdisplay /dev/hde
--- Physical volume ---
PV Name /dev/hde
VG Name data_group
PV Size 111.79 GB [234441648 secs] / NOT usable 4.25 MB [LVM: 239
KB]
PV# 1
PV Status available
Allocatable yes
Cur LV 1
PE Size (KByte) 4096
Total PE 28617
Free PE 3017
Allocated PE 25600
PV UUID x1l2a2-XUzX-XEjZ-hP3k-qAmo-G5jH-U1z1C8



# vgcfgrestore -n data_group -ll vgcfgrestore -- INFO: using backup file "/etc/lvmconf/data_group.conf" --- Volume group --- VG Name data_group VG Access read/write VG Status NOT available/resizable VG # 0 MAX LV 256 Cur LV 1 Open LV 0 MAX LV Size 255.99 GB Max PV 256 Cur PV 1 Act PV 1 VG Size 111.79 GB PE Size 4 MB Total PE 28617 Alloc PE / Size 25600 / 100 GB Free PE / Size 3017 / 11.79 GB VG UUID rVEO6Y-kq5c-5SR0-uw0I-VPF1-v1ka-HK1WQS

--- Logical volume ---
LV Name                /dev/data_group/logical_volume1
VG Name                data_group
LV Write Access        read/write
LV Status              NOT available
LV #                   1
# open                 0
LV Size                100 GB
Current LE             25600
Allocated LE           25600
Allocation             next free
Read ahead sectors     10000
Block device           58:0


--- Physical volume ---
PV Name /dev/hde
VG Name data_group
PV Size 111.79 GB [234441648 secs] / NOT usable 4.25 MB [LVM: 239
KB]
PV# 1
PV Status available
Allocatable yes
Cur LV 1
PE Size (KByte) 4096
Total PE 28617
Free PE 3017
Allocated PE 25600
PV UUID x1l2a2-XUzX-XEjZ-hP3k-qAmo-G5jH-U1z1C8



Heinz J . Mauelshagen wrote:




Duane,

since you're running 1.0.3 I assume you might be hitting an array derefenerence
bug in the LVM1 library we fixed in 1.0.6.

Please upgrade to 1.0.7 and try again.

Regards,
Heinz    -- The LVM Guy --

On Sun, Apr 27, 2003 at 12:22:59PM -0600, Duane Evenson wrote:




I'm having troubles and can't find the solution in the HOWTO, or the archived mailing lists articles.
I installed lvm on an entire hard drive (hde), made one logical group with a logical volume of 100G.
I mounted to volume, copied files over OK, but vgscan caused segmentation faults.
I rebooted, hoping that it was a conflict between the kernel info and physical info. Obviously, it wasn't.
Here are the results of running pvdisplay, pvscan, vgscan, and vgdisplay.


# pvdisplay /dev/hde -v
--- Physical volume ---
PV Name /dev/hde
VG Name data_group
PV Size 111.79 GB [234441648 secs] / NOT usable 4.25 MB [LVM: 239
KB]
PV# 1
PV Status available
Allocatable yes
Cur LV 1
PE Size (KByte) 4096
Total PE 28617
Free PE 3017
Allocated PE 25600
PV UUID x1l2a2-XUzX-XEjZ-hP3k-qAmo-G5jH-U1z1C8


pvdisplay -- "/etc/lvmtab.d/data_group" doesn't exist

# pvscan -v
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- walking through all physical volumes found
pvscan -- inactive PV "/dev/hde" is associated to unknown VG "data_group" (run
vgscan)
pvscan -- total: 1 [111.79 GB] / in use: 1 [111.79 GB] / in no VG: 0 [0]


# vgscan -v
vgscan -- removing "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- creating empty "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- scanning for all active volume group(s) first
vgscan -- reading data of volume group "data_group" from physical volume(s)
Segmentation fault

# vgscan -d
...
<55555> pv_create_name_from_kdev_t -- LEAVING with dev_name: /dev/hde
<55555> system_id_check_exported -- CALLED
<55555> system_id_check_exported -- LEAVING with ret: 0
<4444> pv_read -- LEAVING with ret: 0
<4444> vg_copy_from_disk -- CALLED
<55555> vg_check_vg_disk_t_consistency -- CALLED
<666666> vg_check_name -- CALLED with VG:
<7777777> lvm_check_chars -- CALLED with name: ""
<7777777> lvm_check_chars -- LEAVING with ret: 0
<666666> vg_check_name -- LEAVING with ret: 0
<55555> vg_check_vg_disk_t_consistency -- LEAVING with ret: -344
<4444> vg_copy_from_disk -- LEAVING
Segmentation fault

# vgdisplay data_group -h
Logical Volume Manager 1.0.3
Heinz Mauelshagen, Sistina Software  19/02/2002 (IOP 10)

vgdisplay -- display volume group information






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

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                56242 Marienrachdorf
                                                Germany
Mauelshagen Sistina com                           +49 2626 141200
                                                     FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

_______________________________________________
linux-lvm mailing list
linux-lvm sistina com
http://lists.sistina.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/







_______________________________________________
linux-lvm mailing list
linux-lvm sistina com
http://lists.sistina.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/



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

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                 56242 Marienrachdorf
                                                 Germany
Mauelshagen Sistina com                           +49 2626 141200
                                                      FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

_______________________________________________
linux-lvm mailing list
linux-lvm sistina com
http://lists.sistina.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/









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