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Date:	Mon, 12 Nov 2012 17:29:31 +0100
From:	"kaefert@...il.com" <kaefert@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: e2fsck extremly slow after: EXT4-fs.. ext4_check_descriptors:
 Checksum for group .. failed

2012/11/12 Theodore Ts'o <tytso@....edu>:
>
> You said this is an external USB drive, right?  How big is it?

Yep, its an external USB3.0 3TB disk.

>  If it's affordable, something I would suggest doing is to make image copy
> (i.e., using dd or dd_rescue) to another external USB drive, just to
> rule out hardware issues.

I'm sorry but I don't have a spare one of those lying around, but
wouldn't I see hardware errors in the dmesg output?

>
> The Pass 1B/1C/1D errors, particularly if you are seeing the exact
> same pattern after running a full e2fsck -fy run, makes me suspicious
> that inode table blocks are getting written to the wrong location on
> disk --- and whether this is caused by the storage device failing in
> some strange way.
>
> Also, can you save the output of e2fsck to a file?  Direct the output
> to a log file, so I can look at it.  There are patterns of the
> "millions of entries of the same pattern" which you've elided which
> can be a hint.

Yep, no problem, I'll send you a complete output in an hour or two,
when I'm home.
I just omitted those since its really huge and it looked to me like if
its only counting from the smallest number to the biggest, and
skipping some numbers in between.

> Also, can you disable the German translation to make
> it easier for me to investigate?

Could you tell me how to disable the German translations? sorry...

>
> Thanks,
>
>                                                 - Ted


Thanks for looking into my issue!

Regards, Thomas
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