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Date:	Mon, 10 Sep 2012 08:48:46 -0500
From:	Terry <td3201@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4 won't mount - fsck required - 2nd fsck in less than a week

On Sun, Sep 9, 2012 at 10:18 PM, Terry <td3201@...il.com> wrote:
> On Sun, Sep 9, 2012 at 9:53 PM, Terry <td3201@...il.com> wrote:
>> On Sun, Sep 9, 2012 at 9:47 PM, Theodore Ts'o <tytso@....edu> wrote:
>>> On Sun, Sep 09, 2012 at 09:34:10PM -0500, Terry wrote:
>>>>
>>>> As the subject says, we have a 15 TB fsck drive that won't mount with
>>>> these errors:
>>>>
>>>> Sep 9 20:02:20 narf kernel: EXT4-fs (dm-9): ext4_check_descriptors:
>>>> Inode bitmap for group 3200 not in group (block 4161027887)!
>>>> Sep 9 20:02:20 narf kernel: EXT4-fs (dm-9): group descriptors corrupted!
>>>
>>> These indicate a very basic file system corruption where the block
>>> group descriptors are corrupted.  E2fsck will complain immediately
>>> upon seeing this sort of fs inconsistency, and the first thing it will
>>> try to do is fix it.
>>>
>>>> We did a proactive fsck on Tuesday of last week because it was
>>>> starting to give filesystem errors. It ran through and mounted fine.
>>>>
>>>> The filesystem lives on an equallogic SAN spread across 36 drives.
>>>> Could this be something with the physical layer or is it not abnormal
>>>> to have to run multiple rounds of fsck to fully fix an issue?
>>>
>>> This is most probably a hardware problem; normally e2fsck will fix
>>> file system corruptions (and certainly problems such as corrupt block
>>> group scriptors) in a single pass.  If e2fsck finished and the file
>>> system mounted fine last week, and now you're getting this kind of
>>> error, it basically screams some kind of physical layer problem, or
>>> perhaps a bad hard drive, or perhaps the SAN disk is getting
>>> incorrectly written to by some other system, etc.
>>>
>>>                                      - Ted
>>
>> Thanks for the reply.  It is part of a RHEL cluster but we did not
>> have any situations where multiple systems mounted the filesystem.  It
>> is a an old SAN so perhaps we have a physical issue. We'll see what it
>> happens with this pass.
>
> While I am waiting for fsck to finish, another thought. This
> filesystem contains a lot of small files. 35,867,642 files to be
> exact.  Anything else I should check or know to ensure a smooth
> operation for these types of filesystems?  I formatted them with
> standard RHEL 6 options.

FSCK completed fixing a lot of things.  The file system then mounted
without any errors.  We are still getting these types of errors in
/var/log/messages:

Sep 10 08:40:49 narf kernel: EXT4-fs error (device dm-6):
ext4_dx_find_entry: bad entry in directory #743966900: directory entry
across blocks - block=2975876794offset=0(946176), inode=1414751737,
rec_len=45724, name_len=206

Thoughts?
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