Re: xfsrestore Does Only Only Partial Restore

[Bill Kendall <wkendall@sgi.com>]

Gim Leong Chin wrote:
> Hi Bill,
> 
> I have attached the xfsrestore version 3.0.1 last 20k log of my last dump file.  I will be doing with version 3.0.5 of all three of my dumps (all three are bad, I got 32 GB, 44 GB and 49 GB back).
> 
> Please let me know if this is useful.
> 
> Thank you.

Looks like the corrupt portion of the dump caused xfsdump to think it
needed to read a ton of data before it could move on. So it was
reading 256 KiB at a time until it hit the end of the file. I'll
probably need the last 1 million lines or so in order to see what
happened before it got into this state.

Thanks,
Bill

> 
> 
> GL
> 
> 
> --- On Tue, 30/8/11, Bill Kendall <wkendall@sgi.com> wrote:
> 
>> From: Bill Kendall <wkendall@sgi.com>
>> Subject: Re: xfsrestore Does Only Only Partial Restore
>> To: "Gim Leong Chin" <chingimleong@yahoo.com.sg>
>> Cc: xfs@oss.sgi.com
>> Date: Tuesday, 30 August, 2011, 12:44 AM
>> Gim Leong Chin wrote:
>>> Hi Bill,
>>>
>>> Right now the log file is already over 500 MB and
>> growing.  Even after compression I do not think I can
>> mail it as an attachment.
>>> Is there any other way that I can send you the log
>> files?
>>
>> If you could just send the last few thousand lines that
>> should be sufficient.
>> If I do end up needing more than that I can provide an ftp
>> drop for you.
>>
>> Thanks,
>> Bill
>>
>>>
>>> GL
>>>
>>> --- On Mon, 29/8/11, Bill Kendall <wkendall@sgi.com>
>> wrote:
>>>> From: Bill Kendall <wkendall@sgi.com>
>>>> Subject: Re: xfsrestore Does Only Only Partial
>> Restore
>>>> To: "Gim Leong Chin" <chingimleong@yahoo.com.sg>
>>>> Cc: xfs@oss.sgi.com
>>>> Date: Monday, 29 August, 2011, 10:11 PM
>>>> Gim Leong Chin wrote:
>>>>> Hi,
>>>>>
>>>>> This is the very first time I tried doing a
>> xfsrestore
>>>> of a back up and I hit some serious trouble.
>>>>> I had openSUSE 11.1 (kernel 2.6.27) on my
>> Acer
>>>> notebook.  I did a xfsdump of /home to a WD
>> My Passport
>>>> external USB hard drive with XFS on it.
>>>>> I installed openSUSE 11.4 (kernel 2.6.37),
>> then tried
>>>> to do xfsrestore from the WD USB drive.  The
>> dump file
>>>> is 121 GB.
>>>>> I tried two times on two different days, but
>> each time
>>>> the xfsrestore would stop writing at the exact
>> same point,
>>>> 49 GB and say success at the end.
>>>>> I then copied the dump file to one hard drive
>> on my
>>>> desk top, and did a dump to another hard drive,
>> to
>>>> /tmp/mnt3.  I get back identical messages:
>>>> ...
>>>>
>>>>> 9>xfsrestore: attempt to read 1008286921
>> bytes
>>>> failed: end of recorded data
>>>>
>>>> xfsdump breaks a file's data into "extents" that
>> are a max
>>>> size of 16 MB.
>>>> The fact that this is trying to read almost 1 GB
>> here
>>>> indicates that
>>>> the extend header is corrupt.
>>>>
>>>> ...
>>>>
>>>>>     xfsrestore: content.c:7510:
>>>> restore_extent_group: Assertion `ehdr.eh_type ==
>> 4' failed.
>>>> As Dave said, this also indicates a corrupt extent
>> header.
>>>> I'd recommend adding "-v 5" to your xfsrestore
>> command line
>>>> and redirecting the
>>>> (very verbose) output to a file, and send that
>> compressed
>>>> output to me or the
>>>> list. It'd be best to do this with more than one
>> of your
>>>> dumps so we can see
>>>> if there's a pattern to where the corruption
>> occurs.
>>>> Bill
>>>>
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