LVM+Ext3 - recover the ext3 partition?

Question

I setup a new email server today and I did lvm for the main drive and then LVM for /opt.

I realized I did not give myself enough room for /opt so I decided to try and extend it and I must of screwed up the instructions because on reboot I get some errors.

it does find both lvm groups (found volume group opt using metadata type lvm2 and found volume group (myhostname) usint metadata type lvm2) then it says: fsck.ext3: bad magic number in super-block while trying to open /dev/opt/opt the superblock could not be read or does not describe a correct ext2 file system etcetc.

I did try to manually scan it but it does not work. the issue is with sdb//dev/opt/opt

fdisk -l /dev/sdb

Disk /dev/sdb: 64.4 GB, 64424509440 bytes 255 heads, 63 sectors/track, 7832 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00babcaf

Device Boot Start End Blocks Id System /dev/sdb1 1 7832 62910508+ 83 Linux

PVscan: zimbra:~# pvscan PV /dev/sdb1 VG opt lvm2 [40.00 GB / 96.00 MB free] PV /dev/sda2 VG hostname lvm2 [39.75 GB / 0 free] Total: 2 [79.75 GB] / in use: 2 [79.75 GB] / in no VG: 0 [0 ]

lvscan: lvscan ACTIVE '/dev/opt/opt' [39.90 GB] inherit ACTIVE '/dev/hostname/root' [38.08 GB] inherit ACTIVE '/dev/hostname/swap_1' [1.68 GB] inherit

vgscan Reading all physical volumes. This may take a while... Found volume group "opt" using metadata type lvm2 Found volume group "hostname" using metadata type lvm2

any ideas on how I can get this fixed? the data is not super critical but rather not start over

thanks

It doesn't seem like you have an LVM problems. Could you perhaps describe how you extened the LV/File System? — katriel, Jun 19 '10 at 21:23
Now you know why you should always make a backup before fiddling with partitions. — John Gardeniers, Jun 20 '10 at 00:10

score 0 · Accepted Answer · answered Jun 20 '10 at 21:48

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yeah :) I did have a backup though, but I had done a few changes. I followed a guide and I had done one big mistake, when I first setup LVM I did not fdisk my drive into sdb1, so I created the LVM right on sdb and I think when I created sdb1 after giving the drive more room it causes the original stuff to poof.

still learning LVM.

either way I am all good now, I just started over, used my backups and voila.

thanks though.

answered Jun 20 '10 at 21:48

Luma

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From what you say, the partition table overwrote part of your LVM / partition data, which is a pretty serious problem. You might have recovered some data, but it almost certainly would be faster to start over. – Slartibartfast Jun 20 '10 at 23:08

LVM+Ext3 - recover the ext3 partition?

1 Answers1