Additional information explaining what caused the below
errors:
+++++++++++++++ start
+++++++++++++++++++++++++++++++++++++++++++++
<root@paxton:~>#
fdisk /dev/sdo1
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 3541.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for
help): o
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 3541.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for
help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for
help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-3541, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-3541, default 3541):
Using default value 3541
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-3541, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-3541, default 3541):
Using default value 3541
Command (m for
help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for
help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for
help): p
Disk /dev/sdo1:
29.1 GB, 29133909504 bytes
255 heads, 63 sectors/track, 3541 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
255 heads, 63 sectors/track, 3541 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot
Start End
Blocks Id
System
/dev/sdo1p1 1 3541 28443051 8e Linux LVM
/dev/sdo1p1 1 3541 28443051 8e Linux LVM
Command (m for
help): v
62 unallocated sectors
62 unallocated sectors
Command (m for
help): v
62 unallocated sectors
62 unallocated sectors
Command (m for
help): w
The partition table has been altered!
The partition table has been altered!
Calling ioctl() to
re-read partition table.
WARNING:
Re-reading the partition table failed with error 16: Device or resource
busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
+++++++++++++++++++++++++++++ end
++++++++++++++++++++++++++++++++++++++
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On Behalf Of Stein, Paul (TLR Corp)
Sent: Friday, September 23, 2005 11:20 AM
To: linux-lvm@redhat.com
Subject: Recover Partition Table - vgdisplay/vgscan fails
I inadvertantly blew
away the partition table on /dev/sdo that was in use. While the system is still
running and no errors have occured...yet, I need
to get the partition
table restored and be able to vgdisplay the datavg. Below is the sampling
of error messages.
<root@paxton:/proc/lvm># vgdisplay
datavg
vgdisplay -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please run vgscan
vgdisplay -- ERROR: VGDA in kernel and lvmtab are NOT consistent; please run vgscan
<root@paxton:/proc/lvm>#
vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found active volume group "rootvg"
vgscan -- found active volume group "localvg"
vgscan -- found active volume group "datavg"
vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group "datavg" 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 groups
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found active volume group "rootvg"
vgscan -- found active volume group "localvg"
vgscan -- found active volume group "datavg"
vgscan -- ERROR "vg_read_with_pv_and_lv(): current PV" can't get data of volume group "datavg" 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 groups
Is it safe to clear
VGDA using the "dd if=/dev/zero of=PhysicalVolume bs=512 count=1" shown in
the pvcreate man pages and the come back and
recreate the
VGDA using pvcreate, or use pvcreate outright not using the dd method? Or,
is there a better method to get /dev/sdo back into the
datavg
group while
recreating the partition table?
Paul Stein
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