[linux-lvm] vgchange partial mount fails
Tom Robinson
tom.robinson at oxtel.com
Tue Nov 8 11:06:09 UTC 2005
Heinz Mauelshagen wrote:
>On Mon, Nov 07, 2005 at 10:12:32PM +0000, Tom Robinson wrote:
>
>
>>Hi,
>>
>>I'm trying to do a partial mount of a VG in order to rescue data from it
>>(the last of the 8 PVs has died)
>>
>>If I do vgchange -P -a y vg1
>>It says:
>>
>> Partial mode. Incomplete volume groups will be activated read-only.
>> 7 PV(s) found for VG vg1: expected 8
>> Logical volume (lv1) contains an incomplete mapping table.
>> 7 PV(s) found for VG vg1: expected 8
>> Logical volume (lv1) contains an incomplete mapping table.
>> 1 logical volume(s) in volume group "vg1" now active
>>
>>Which looks like it might have worked, but in /dev/mapper I have:
>>
>>crw-rw---- 1 root root 10, 63 May 30 02:48 control
>>brw------- 1 root root 254, 0 Oct 25 13:20 vg1-lv1
>>
>>But I can't mount vg1-lv1 (its ext2 - but it says "must specify fs type).
>>
>>
>
>Looks like expected behaviour.
>
>You're likely missing the beginning of your filesystem which was mapped
>to the dead PV and the fs code fails to find its metadata
>(ie. superblock).
>
>Check with "lvdisplay -m /dev/vg1/lv1"
>
>
Thanks for your response, Heinz,
vaus root # lvdisplay -m /dev/vg1/lv1
7 PV(s) found for VG vg1: expected 8
7 PV(s) found for VG vg1: expected 8
Volume group "vg1" not found
Thing is, /dev/vg1/lv1 doesn't exist at all,
It used to, when everything was working.
Only /dev/mapper exists.
I have had the server running for about 3 years,
and only added the last (dead) PV about 2 months ago
so would it still put the superblock there?
Any suggestions at all on how to rescue any data?
Oh, heres the first bit of output of lvdisplay -mP /dev/vg1/lv1
if it helps:
Partial mode. Incomplete volume groups will be activated read-only.
--- Logical volume ---
LV Name /dev/vg1/lv1
VG Name vg1
LV UUID 000000-0000-0000-0000-0000-0000-000000
LV Write Access read/write
LV Status available
# open 1
LV Size 1.51 TB
Current LE 49447
Segments 7486
Allocation normal
Read ahead sectors 1024
Block device 254:0
--- Segments ---
Logical extent 0 to 4883:
Type linear
Physical volume /dev/cdrom
Physical extents 0 to 4883
Logical extent 4884 to 8545:
Type linear
Physical volume /dev/hdf
Physical extents 0 to 3661
Logical extent 8546 to 12051:
Type linear
Physical volume /dev/hde4
Physical extents 0 to 3505
Logical extent 12052 to 19530:
Type linear
Physical volume /dev/hdh
Physical extents 0 to 7478
Logical extent 19531 to 27009:
Type linear
Physical volume /dev/hda
Physical extents 0 to 7478
Logical extent 27010 to 34488:
Type linear
Physical volume /dev/hdb
Physical extents 0 to 7478
Logical extent 34489 to 41967:
Type linear
Physical volume /dev/hdc
Physical extents 0 to 7478
Logical extent 41968 to 41968:
Type linear
Physical volume Missing
Logical extent 41969 to 41969:
Type linear
Physical volume Missing
etc......
Regards,
Tom
>Regards,
>Heinz -- The LVM Guy --
>
>
>
vaus root # lvdisplay -m /dev/vg1/lv1
7 PV(s) found for VG vg1: expected 8
7 PV(s) found for VG vg1: expected 8
Volume group "vg1" not found
>>What is wrong? Have I misconfigured lvm / dm?
>>are there any lines I need in my config file?
>>Are there any tools I can run to get more info?
>>
>>The array was built with LVM1 & 2.4.18,
>>I'm now using LVM2/DM under 2.6.11.10
>>
>>Also, It looks like it has done something, because if I try
>>to deactivate it with "vgchange -P -a n vg1" I get:
>>
>> Partial mode. Incomplete volume groups will be activated read-only.
>> 7 PV(s) found for VG vg1: expected 8
>> Logical volume (lv1) contains an incomplete mapping table.
>> Can't deactivate volume group "vg1" with 1 open logical volume(s)
>>
>>Any help greatly appreciated.
>>Kind regards,
>>Tom
>>
>>
>>_______________________________________________
>>linux-lvm mailing list
>>linux-lvm at redhat.com
>>https://www.redhat.com/mailman/listinfo/linux-lvm
>>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>>
>>
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
>Heinz Mauelshagen Red Hat GmbH
>Consulting Development Engineer Am Sonnenhang 11
>Cluster and Storage Development 56242 Marienrachdorf
> Germany
>Mauelshagen at RedHat.com +49 2626 141200
> FAX 924446
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
>_______________________________________________
>linux-lvm mailing list
>linux-lvm at redhat.com
>https://www.redhat.com/mailman/listinfo/linux-lvm
>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>
>
More information about the linux-lvm
mailing list