Re: broken raid level 5 array caused by user error

[Phil Turmel <philip@turmel.org>]

On 11/10/2015 04:33 PM, Mathias Mueller wrote:
> Hi Phil,
> 
>>> This both combinations
>>
>> Well, I gave you *four* combinations for order, and two suggestions for
>> chunk size.  Eight combinations to try.
> 
> Sorry, this two words were just the beginning of a sentence, which I
> didn't finish an forgot to remove :)
> 
> I tried 16 combinations at all (eight with --data-offset=1024 and eight
> with --data-offset=2048), the following four combinations gave the
> "/dev/md0 has unsupported feature(s)" message occurs:
> 
> --data-offset=1024 --chunk 64: sde sdd sdb sdc
> --data-offset=1024 --chunk 512: sde sdd sdb sdc
> --data-offset=1024 --chunk 64: sde sdb sdd sdc
> --data-offset=1024 --chunk 512: sde sdb sdd sdc
> 
> the other four combinations with --data-offset=1024 and all eight
> combinations with --data-offset=2048 gave
> 
> fsck.ext2: Superblock invalid, trying backup superblocks...
> fsck.ext2: Bad magic number in super-block while trying to open /dev/md0

You're not providing enough information.  Show the new vs. old
name/serial combinations, then show the --create and fsck
command/output, one by one.

For now, use data offset 2048 for all of them.

Phil