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List: linux-ext4
Subject: Re: need help with getting into a corrupted sub directory
From: Andreas Dilger <adilger () sun ! com>
Date: 2010-01-31 18:11:25
Message-ID: 573A48EF-7CE3-481D-935E-364506424D1F () sun ! com
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On 2010-01-30, at 10:44, tytso@mit.edu wrote:
> On Sat, Jan 30, 2010 at 12:24:09AM -0700, Andreas Dilger wrote:
>> On 2010-01-29, at 23:07, kyle wrote:
>>> I have a ext3 filesystem created inside a problematic seagate
>>> ST3500320AS drive. The drive will just shut itself down
>>> automatically
>>> whenever it hits any read error.
>>
>> Strange, I had to do the same for a friend, and I think it was the
>> same drive.
>> You should put it into a USB enclosure - it speeds things up a lot.
I just checked the drive type that I had this problem on, it is
ST3320620AS, as I kept it in case there needed to be more rescue work
done. Not exactly the same, but I don't know enough about Seagate
model numbers to determine how related they are.
> An image copy of the disk will tend to recover more than accessing the
> disk via the file system. I haven't run across the failure mode where
> accessing a certain magic block causes the disk to die and require a
> power cycle, but in that case what I'd probably do is enhance the
> dd_rescue program to take a list of block numbers which it should skip
> over....
Well, I thought the same thing initially, but like the poster I have a
drive which dies (locks up internally? I don't know) as soon as
certain files are accessed. Since I could get 95%+ of the files
using the "rsync -av --exclude-from {bad_file_list}" method, and the
files I couldn't recover were of marginal value, I did that, as it was
expedient.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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