sda2 is corrupted

[Mark C. Allman]

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On Thu, 2012-07-05 at 14:30 -0400, Jim wrote:
> On 07/05/2012 02:13 PM, Mark C. Allman wrote:
> > On Thu, 2012-07-05 at 13:47 -0400, Jim wrote:
> >> On 07/05/2012 01:23 PM, Mateusz Marzantowicz wrote:
> >>> On 05.07.2012 19:15, Jim wrote:
> >>>> Fedora 17
> >>>>
> >>>> the sda2 /home is corruoted and it changed /home partitiion to UNKNOWN
> >>>> and it won't let me change the label back to /home
> >>>>
> >>>> I have tried to use fedora and Gparted with no luck.
> >>>>
> >>>> There are some important data files  I must save off of sda2
> >>>>
> >>>>
> >>> 1. What is the type of that file system?
> >> ext4
> >>> 2. Can you paste error messages related to this partition?
> >> No , Gparted can not mount it either
> >>> 3. What happens after system reboot? Does it mount or not?
> >> No , only  / is mounted
> >>>
> >>> Mateusz Marzantowicz
> >>
> > So when the system reboots you see a /dev/sda2 device, correct?
> >
> > When you type "mount /dev/sda2 /somewhere" (where "somewhere" is some
> > existing, handy mount point) you get an error message saying that the
> > file system isn't recognized or can't be determined?
> >
> > If you type "mount -t ext4 /dev/sda2 /somewhere" you get an error
> > message, e.g., "not an ext4 filesystem?"
> >
> > What I would try next is running "e2fsck -n /dev/sda2" and see what that
> > says.  The "-n" to insure nothing is written to the disk (just in case).
> > Try it and post the results to the list here.  The partition superblock
> > may be corrupted and I have no idea what e2fsck will try to do if that's
> > the case.  It may just give up without looking at the backup superblock.
> >
>   # e2fsck -n /dev/sda2
> e2fsck 1.42 (29-Nov-2011)
> e2fsck: Superblock invalid, trying backup blocks...
> Superblock has an invalid journal (inode 8).
> Clear? no
> 
> e2fsck: Illegal inode number while checking ext3 journal for /home
> 
> /home: ********** WARNING: Filesystem still has errors **********
> 
> 

Before you do anything else I would definitely make the backup copy of
the partition as suggested earlier in another post using "dd."

At this point I defer to the disk partition wizards on the list.  I have
no idea what would happen if you were to remove the "-n" switch and tell
e2fsck to clear the journal.  If I read the output from e2fsck right it
looks like a backup superblock was found (which is good, I'd think).

-- 
Mark C. Allman, PMP, CSM
Founder, See How You Ski
Allman Professional Consulting, Inc., www.allmanpc.com
617-947-4263, Twitter:  @allmanpc