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Re: [linux-lvm] vgchange partial mount fails



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


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

Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Cluster and Storage Development                   56242 Marienrachdorf
                                                 Germany
Mauelshagen RedHat com                            +49 2626 141200
                                                      FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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




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