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Re: [linux-lvm] Device mapper problems..



Lars Ellenberg wrote:

/ 2005-09-16 02:23:46 +0300
\ Suleyman Kutlu:

Two VGs.

systemvg on /dev/sda4
datavg on /dev/sdb1


slightly moving the chunks around in your mail,
so it is more obvious...

What I am trying to do is:

- At least get the directory contents of the filesystem
 /dev/datavg/snk2lv inorder to know what I have lost.
 Is it possible to get this with jfsutils ??  Any experience ?

hm...

- If there is a way to fix-up the device-mapper tables and get my
 filesystems back, it is ofcourse welcome.

well, comparing this:

ls -la /dev/mapper
total 124
drwxr-xr-x   2 root root    4096 Sep 16  2005 .
drwxr-xr-x  36 root root  118784 Sep 16 01:49 ..
crw-------   1 root root  10, 63 Sep 16  2005 control

brw-------   1 root root 253,  0 Jun  5 03:24 systemvg-optlv
brw-------   1 root root 253,  1 Jun  5 03:25 systemvg-varlv
brw-------   1 root root 253,  1 May 10 03:08 systemvg-rootlv
brw-------   1 root root 253,  2 Jun  5 03:26 systemvg-tmplv
brw-------   1 root root 253,  3 Jun  5 03:26 systemvg-usrlv
brw-------   1 root root 253,  4 Jun  5 03:27 systemvg-temp

brw-------   1 root root 253,  6 Jul 16 20:32 datavg-rootlv
brw-------   1 root root 253,  7 Jul 16 22:40 datavg-snk2lv
brw-------   1 root root 253,  8 Sep 16  2005 datavg-backup

dmsetup ls output is:

systemvg-optlv (253, 0)
systemvg-tmplv (253, 1)
systemvg-usrlv (253, 2)
systemvg-varlv (253, 3)
systemvg-temp  (253, 4)
systemvg-rootlv(253, 5)

datavg-rootlv  (253, 6)
datavg-snk2lv  (253, 7)
datavg-backup  (253, 8)


for a start,
we see that the device nodes for -optlv and -temp are correct,
and the datavg seems correct.

but 253,1 apears two times in the listing, and 253,5 is missing...

recreate those nodes with
# dmsetup mknodes

or by hand with:
# cd /dev/mapper
# rm systemvg-{varlv,rootlv,tmplv,usrlv}
# mknod systemvg-tmplv   b 253 1
# mknod systemvg-usrlv   b 253 2
# mknod systemvg-varlv   b 253 3
# mknod systemvg-rootlv  b 253 5

now, how this could happen is an other question.

note that maybe the mapping of names to minors is still wrong.
but at least all of the devices should be there again;
(253,5) was missing completely before.

hope that gets you one step further.


You are right, datavg seems OK from the device-mapper point of view. But at filesystem level, the filesystem on datavg-snk2lv seems to be 4.0 GB but in fact it is 80 GB. My opinion is at a point in past, device-mapper again scramled the major and minor numbers and systemvg-usrlv overwrited datavg-snk2lv.

From dmsetup table output, datavg-snk2lv seems OK. How can I recover the filesystem on it ? Or more basic question, is it possible to recover ???

Thanks in advance..

*
* Suleyman Kutlu
* mailto: suleyman kutlu gmail com
*


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