[linux-lvm] Device mapper problems..
Suleyman Kutlu
suleyman.kutlu at gmail.com
Thu Sep 15 23:23:46 UTC 2005
Hello,
Thanks for your reply.
Here is the results from my system:
Two VGs.
systemvg on /dev/sda4
datavg on /dev/sdb1
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, 8 Sep 16 2005 datavg-backup
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, 0 Jun 5 03:24 systemvg-optlv
brw------- 1 root root 253, 1 May 10 03:08 systemvg-rootlv
brw------- 1 root root 253, 4 Jun 5 03:27 systemvg-temp
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, 1 Jun 5 03:25 systemvg-varlv
df -h output is follows:
Filesystem Size Used Avail Use% Mounted on
/dev/root/rootlv 1008M 255M 702M 27% /
tmpfs 500M 24K 500M 1% /dev/shm
/dev/sda2 54M 7.1M 44M 14% /boot
/dev/mapper/systemvg-optlv 3.0G 607M 2.4G 20% /opt <--,
These filesystems and their
/dev/mapper/systemvg-tmplv 4.0G 2.7G 1.4G 67% /usr <---
mapped devices are scrambled
/dev/mapper/systemvg-usrlv 2.0G 442M 1.6G 22% /var <---
and I found this combination
/dev/mapper/systemvg-varlv 2.0G 4.7M 2.0G 1% /tmp <--'
by try-and-find !!
/dev/mapper/datavg-backup 69G 33M 69G 1% /mnt/backup
/dev/mapper/datavg-rootlv 1020M 261M 760M 26% /mnt/datavg-rootlv
/dev/mapper/datavg-snk2lv 4.0G 2.7G 1.4G 68% /mnt/datavg-snk2
<---- This filesystem is broken
/dev/mapper/systemvg-rootlv 2.0G 4.7M 2.0G 1% /mnt/systemvg-rootlv
/dev/mapper/systemvg-temp 91G 63G 29G 69% /mnt/systemvg-temp
dmsetup ls output is:
systemvg-temp (253, 4)
systemvg-usrlv (253, 2)
systemvg-tmplv (253, 1)
systemvg-rootlv (253, 5)
systemvg-varlv (253, 3)
datavg-backup (253, 8)
datavg-snk2lv (253, 7)
datavg-rootlv (253, 6)
systemvg-optlv (253, 0)
dmsetup table output is:
systemvg-temp: 0 190791680 linear 8:4 33554816
systemvg-usrlv: 0 8388608 linear 8:4 20971904
systemvg-tmplv: 0 4194304 linear 8:4 16777600
systemvg-rootlv: 0 2097152 linear 8:4 384
systemvg-varlv: 0 4194304 linear 8:4 29360512
datavg-backup: 0 104857600 linear 8:17 41943424
datavg-backup: 104857600 37830656 linear 8:17 274727296
datavg-snk2lv: 0 39845888 linear 8:17 2097536
datavg-snk2lv: 39845888 127926272 linear 8:17 146801024
datavg-rootlv: 0 2097152 linear 8:17 384
systemvg-optlv: 0 6291456 linear 8:4 10486144
LV Dsplay for /dev/datavg/snk2lv :
--- Logical volume ---
LV Name /dev/datavg/snk2lv
VG Name datavg
LV UUID MCuj5G-XO1e-z3OE-BT9N-Lr5p-SbCO-3U8D4K
LV Write Access read/write
LV Status available
# open 1
LV Size 80.00 GB
Current LE 20480
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:7
As you can see it is 80 GB but in df -h output, it is only 4 GB, and the
contents of the filesystem is something like the contents of /usr, I
think a snapshot of /usr at the time when this error occured.
Also here are the vgdisplay -v output and dmsetup info output....
Also here is the fdisk -l output, incase needed..
fdisk -l
Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 5222 41945683+ 7 HPFS/NTFS
/dev/sda2 5223 5229 56227+ 83 Linux
/dev/sda3 5230 5491 2104515 82 Linux swap / Solaris
/dev/sda4 5492 19456 112173862+ 8e Linux LVM
Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 19456 156280288+ 8e Linux LVM
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 ?
- If there is a way to fix-up the device-mapper tables and get my
filesystems back, it is ofcourse welcome.
Thanks in advance....
Fabian Herschel wrote:
>You have a look which device path is used when mounting your both file
>systems (using mount).
>Than you can have a look at the major and minor device number of these
>devices (using ls -la).
>If these devices are using the same major/minor combination the kernel
>assumes these devices
>the be the same. This would show the effects you mentioned.
>
>ls -la /dev/mapper/*
>brw------- 1 root root 253, 3 Jun 21 16:09 /dev/mapper/rootvg-homlv
>brw------- 1 root root 253, 2 Jun 21 16:09 /dev/mapper/rootvg-optlv
>
>in this case rootvg-homlv has major 253 and minor 3, while rootvg-optlv
>has major 253 and minor 2.
>
>best regards
>Fabian Herschel
>
>
>Suleyman Kutlu schrieb:
>
>
>
>>Hello all,
>>
>>
>>I have an AMD-64 machine running SuSE 9.2. I have one SATA disk (for
>>now, will add another later on) and a VG on it. I have created some LVs.
>>
>>Sometimes later, I realized that when I mount an LV (say lv_a) I see
>>the directory structure of another LV (say lv_b). If I issue a df -k,
>>I see a wrong size for lv_a, it is the size of lv_b. But in lvdisplay
>>output, the size for lv_a is correct.
>>
>>The file systems on lv_a and lv_b is JFS.
>>
>>/mnt is mounted as lv_b
>>/mnt2 is mounted as lv_a but has contents of lv_b
>>
>>
>>I thought that, filesystem structure is corrupted and started to work
>>on some filesystem level utilities, but later I see that,
>>another filesystem pair also got the same problem.
>>
>>
>>So I think it is a problem in device-mapper level, not the filesystem
>>level.
>>
>>What can be the possible works to get what is wrong and how to fix ?
>>If the corruption is at filesystem level, do you have any experience
>>on JFS-utils ? I just want to see what was stored in lv_a, what I lost
>>in lv_a...
>>
>>
>>I am new at device-mapper, I don't have enough experience on it and I
>>do not want to loose everything while there is something that can be
>>recovered...
>>
>>Any help is appreciated.
>>
>>Thanks and regards..
>>
>>* Suleyman Kutlu
>>* mailto: suleyman.kutlu at gmail.com
>>
>>_______________________________________________
>>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/
>>
>>
>
>
>
>
>
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