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Old 10-17-2011, 10:11 AM   #1
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power outage turned raid ext3 into ext2, how to fix ?

hi all !

after a power outage the raid5 /dev/md2 couldn't be assembled,
mdadm -Af (forced assemble) worked, and i can access all the data when i mount it as ext2, but it used to be ext3 before and i get errors trying to mount it as that.
any idea how to fix it ? or should i just continue to use it as ext2 ?

after it couldn't be assembled directly (sorry, didn't save the original error message)
i found the right drives using
mdadm --misc --examine /dev/sdX
and used
mdadm -Af /dev/md2 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1
(-A assemble, f:forced) and it worked saying
mdadm: forcing event count in /dev/sde1(0) from 51014 upto 51020

mdadm: forcing event count in /dev/sdf1(1) from 51014 upto 51020

mdadm: forcing event count in /dev/sdg1(2) from 51014 upto 51020

mdadm: forcing event count in /dev/sdh1(3) from 51014 upto 51020

mdadm: forcing event count in /dev/sdi1(4) from 51014 upto 51020
Now when i mount it (i only tried readonly for now) as ext2 it works fine, i can see the files etc,
but it used to be ext3, and when i try to mount it as that i get errors, so something is wrong.

mdadm --misc --examine reportet status clean and correct checksums (i checked before doing forced assemble)

smartctl -H on the physical drives reports they all pass the health-check

# mount -o ro -t ext2 /dev/md2 /media/mytest
works fine, after that umount and
# mount -o ro -t ext3 /dev/md2 /media/mytest
reports :
mount: wrong fs type, bad option, bad superblock on /dev/md2,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

fsck.ext3 /dev/md2 reports :
terra:~# fsck.ext3 /dev/md2 
e2fsck 1.41.3 (12-Oct-2008)
/dev/md2 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Journal inode is not in use, but contains data.  Clear<y>? 

/dev/md2: e2fsck canceled.

/dev/md2: ********** WARNING: Filesystem still has errors **********
where i cancelled to avoid ruining it.

any idea how to fix the error when mounting as ext3 ?
should i just run fsck.ext3 and tell it to clear journal stuff etc, or would that just remove the ext3 stuff and turn it into ext2 ?
Or is it a bigger mess and i should just use it as ext2 for the time being ?
Old 10-17-2011, 10:56 AM   #2
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What you should do is backup your data, format, and restore. And buy an uninterruptable power supply.
Old 10-17-2011, 11:08 AM   #3
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yeah i guess that's what i'll do tomorrow,
it just looks worth trying to recover/fsdisk first since it works mounted as ext2.

Originally Posted by macemoneta View Post
And buy an uninterruptable power supply.
we have some actually, turns out the one linked to the box with the raid-disks failed XD (a separate box outside the controller),
the computer itself was still running (power was back quickly) =)
Old 10-17-2011, 05:45 PM   #4
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The problem is of course that the journal may contain uncommitted updates. So your app(s) think the write has updated the disk, but it ain't there.
Backing up as ext2 merely caries-forward the situation.

... or there may be no problem at all. But I know of no way you can tell - so after an incident like this I scrub everything and do a full restore just to be sure.


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