from: Holger Parplies

"  Hi,
"  
"  Matthias Meyer wrote on 2009-01-18 15:33:30 +0100 [Re: [BackupPC-users] 
errors in cpool after e2fsck corrections]:
"  > Johan Ehnberg wrote:
"  > > Quoting Matthias Meyer <matthias.meyer AT gmx DOT li>:

"  > >> I believe the reason is that
"  > >> /var/lib/backuppc/cpool/8/4/5/845a684e4a8c9fe22d11484dc13e24fc
"  > >> is a directory and not a file. Probably during e2fsck created.

"  no, e2fsck does not *create* directories; this is a clear evidence of on-disk
"  data corruption.

"  The key phrase is
"  
"  > > - Look for the reason for the crash/corruption and prevent it
"  > > from happening
"  
"  - this can likely mean exchanging the disk (cables, mainboard, memory, power
"  supply ...). You don't give any details about your system crash or hardware

In my case, I believe it was memory.  I had three sticks go bad one 
after the other without immediately showing up under intensive 
checking with mtest.  There may have been an underlying reason for 
that.  I also changed the power supply on spec.  New memory has been 
running for over a month now with no obvious problems. 

"  Yes, but do you know the implementation of the ext[23] file system well 
enough
"  to tell what will happen to possible corruption of file system metadata?

My suspicion (it's no more than that) in my case is that there was 
other corruption which also affected the operation of fsck (and 
probably other things as well) itself.  I found a statically linked 
version of fsck which helped quite a bit but I eventually wound up 
restoring the entire machine essentially from bare metal.  As usual, 
my worst enemy was ( and is :-) my own ignorance.

R

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