Re: [Qemu-block] [Qemu-devel] qemu 2.9.0 qcow2 file failed to open after hard server reset

[Vasiliy Tolstov]

2017-12-22 1:58 GMT+03:00 John Snow <address@hidden>:
>
>
> On 12/21/2017 05:13 PM, Vasiliy Tolstov wrote:
>> Hi! Today my server have forced reboot and one of my vm can't start
>> with message:
>> qcow2: Marking image as corrupt: L2 table offset 0x3f786d6c207600
>> unaligned (L1 index: 0); further corruption events will be suppressed
>>
>> i'm use debian jessie with hand builded qemu 2.9.0, i'm try to
>> qemu-img check but it not helps. How can i recover data inside qcow2
>> file? (i'm not use compression or encryption inside it).
>>
>
> Not looking good if you're missing the very first L2 table in its entirety.
>
> You might be able to go through this thing by hand and learn for
> yourself where the L2 table is (it will be a 64KiB region, aligned to a
> 64KiB boundary, that all contain 64bit, 64KiB aligned pointers that will
> be less than the size of the file. the offset of this missing region is
> not likely to be referenced elsewhere in your file.)
>
> and then, once you've found it, you can update the pointer that's wrong.
> However, where there's smoke there's often fire, so...
>
> best of luck.
>
> --js

If i use raw image as i understand this corruption can't happening in raw?

-- 
Vasiliy Tolstov,
e-mail: address@hidden